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Turboprop conversions – built and unbuilt

Apophenia

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Thanks Thomas!

I wasn't sure where to put the jet Me264 - maybe we need a piston-to-jet category ;D

The rest have been added to the lists. About the Trans-Caribbean Turbo Canso, any mention of engine type in Jane's? (I wonder if this firm is in any way related to Trans-Caribbean Airways of the Netherlands Antilles?)
 

Apophenia

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Good question Jens.

Should we start a new "Turboshaft conversions – built and unbuilt" topic?
 

Apophenia

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Added a few more: HAMC Y-11 to Y-11T/Y-12, Yak-18s, Yak-52, Yak-152, Su-26, PA-18T Super Cub, Van's RV-4T, and Mooney 301 to Socata TBM700.

Plus about a dozen others, mostly M601-related.

Does anyone know the current status of the Integrity Aircraft single-turbine Trislander project?

I'm also puzzled by Turbo Dak duplications ... DC-3-65TP is attributed to Shafer, AMI Turbo, Professional Aviation (which I think was just an operator), and Dodson Aviation (who I think is just fitting kits). Does anyone know for sure?

BTW, Professional Aviation was also listed as "Jet Prop DC-3" and "C-47TP Super Dakota", both of which sound pretty generic. Shafer is also credited with a DC-3-67TP. No model given but it could be up to 1650 shp per engine (if PT6A-67CFs used).
 

Jemiba

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I think, we've still yet forgotten the SE.116 Voltigeur. The first prototype
flew with Wright C7BA1 piston engines, whereas the second aircraft was
fitted with Bastan turboprops. Interestingly, the more or less identical
SE.117 was finished with Bastan engines, but it was proposed, to revert to
the Wright engines later !
The contending SIPA 1100 flew with piston engines, but there was a project
to fit Bastan turboprops, too.
 

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Apophenia

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Thanks Jens!

I've added the SE.116/SE.117 and S.1100 as well as the HAL HPT-32/HTT-32 Deepak conversion.
 

alertken

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Most 1944 UK Brabazon Committee civil Types were intended as Mark 1, recip/Mk.II turbine:
Type I Bristol T.167 Brabazon Mk.I/coupled Centaurus was to be Mk.II with coupled Proteus;
Type IIA AS.57 Ambassador, Mk.I 2xCentaurus; Mk.2 4xASM Mamba. It did fly as FTB with Tyne;
Type IIB VC2 Viceroy, 2xCentaurus; before flight became VC2 Viscount/Dart;
Type III, then MRE: Bristol T.175, ordered as 4xCentaurus; changed 1950 before flight to Britannia 100/4xProteus;
Type IIIC Avro 689 Tudor 2/Merlin; Mk.II intended Theseus;
Type VA M.60/H.P.R.1 Marathon, Mk.I 4xGipsy Queen, Mk.2 intended 2xMamba (so flown as FTB).
(Do you count Napier Nomad as turbine-affected? Short/Saro Shetland, 4xCentaurus: Mk.II so bid to BOAC, who laughed).
(Mamba and Dart were initiated for (to be BP Balliol/Avro Athena, which went the other way - to Merlin).

The greatest What-if...? was mid-1947 pitch to UK Cabinet for $ for Bristol licenced L-849, Centaurus Mk.1, Theseus Mk.2. Denied (UK was profoundly broke), else: no DC-7, L-1649, L-188, Britannia. Instead: a DC-6T, either T-34 or RR Clyde, maybe licenced in France.
 

Apophenia

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Excellent stuff -- thank you!

I'm reorganizing the original lists to make them more usable. I'll add these along with those complied by boxkite (thanks again, Thomas!).

ADDED - Lists rationalized and updated. Most are re-mounted below (corrections and additions most welcome).
 

Apophenia

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PISTON/TURBOPROP TEST BEDS

UNBUILT

Avro Lancastrian C Mk3 testbed - 2 x Rolls-Royce RB.39 Clydes in outboard nacelles

Convair YB-60 proposed turboprop testbed (Convair regarded turboprops as potential back-up powerplants in case J57 program failed).

Lockheed L-749A Constellation [F-ZVMV] Turboméca Bastan strut-mounted above fuselage for icing tests. http://members.fortunecity.com/gvanroy1/const/conn14.jpg

McDonnell XV-1 Convertiplane (Continental R-975) to Lycoming T53.

Northrop EB-35B Teledyne T-37 turboprop testbed (R-4360s to be replaced by Allison J35 jets plus first one, then two T-37s).

BUILT

Airspeed Ambassador testbed (G-37-3/G-ARKD) Bristol Proteus 705s, RR Tynes, RR Darts

Airspeed Ambassador testbed (G-ALFR) Napier Elands.

Avro Lancaster tesbeds - nose-mounted Armstrong Mamba (ND784/G and SW342), outer nacelle mounted Armstrong Siddeley Pythons (RE137 mockup nacelles and TW911), and nose-mounted RR Dart (NG465).

Avro Lancastrian C Mk3 testbed - Mamba, Python and Dart (arrangements unknown).

Avro Lincoln testbed - outboard Merlins replaced by Armstrong Siddeley Pythons (RF403, RE339/G and SX972), or Bristol Proteus (SX972), or Bristol Theseus (RA716/G).

Avro Lincoln - testbed - nose-mounted turboprop (as RE530/G-37-1) with Napier Naiad/RR Tyne respectively.

Beechcraft 18 Expeditor (RCAF serial 109) PT6 testbed - nose-mounted turboprop + Wasp Jrs.).

Beech-SFERMA PD 18.9 conversion (Expeditor with twin Turboméca Bastan IVBs).

Boeing EB-17 test-bed (NX-5111N, cockpit moved aft, nose-mounted P&W XT34 Turbo-Wasp and PT5 P&W PT5 (?confirmation of PT5 designation?).

Boeing JB-17G test-bed (N6694C, nose-mounted Wright XT35 Typhoon, then R-3350 radial).
http://www.secretprojects.co.uk/forum/index.php/topic,5283.0.html

Boeing B-17 test-bed (44-85747, standard cockpit position, nose-mounted Allison T-56).

Boeing C-97 (R4360s) [Conv] test-beds for Douglas C-133 (P&W T34-P-7s)

Curtiss C-46G (R-2800-34W) [Conv] to XC-46C (later XC-113) (port R-2800 retained, starboard GE TG-100/T31)

Douglas B-26 Invader/OnMark Marksman C testbed (N26GT, nose-mounted TPE 331)

Douglas YC-124B testbed (51-072) YT-34-P-1 turboprops, larger tail surface for planned turboprop-powered KC-124B tanker.

Douglas JC-124C testbed (52-1069 C-124C conversion) nose-mounted turboprop (T57 for C-132 program).

Lockheed L-749A Constellation [F-ZVMV] (Turboméca Bastan) turboprop strut-mounted above fuselage for icing tests. http://members.fortunecity.com/gvanroy1/const/conn14.jpg

Vickers Varsity (VX835) [Conv] (Napier Eland) testbed

Vickers Wellington (1948) [Conv] into Dart-Wellington (RR Dart) engine test bed

Vickers Viscount (CF-TID, 4 x RR Darts) [Conv] into P&WC tesbed with nose-mounted PT6A

JET-TO-TURBOPROP TESTBEDS

Gloster F.MkI Meteor (RR Derwents) converted to Trent-Meteor (EE227, RB.50 Trents)

JET-TO-TURBOPROP CONVERSIONS

Martin XB-48 (6 x GE J35s) proposed conv (2nd prototype) to turboprop (4 x Allison XT-40A)

JET-PLUS-TURBOPROP TESTBEDS

Boeing XB-47D (4 of 6 J47s replaced by Curtiss Wright YT49-W-1 turboprops)

Boeing B720 ETB (PWC Engine Test Bed C-FETB) with nose-mounted PT6A-68 or PW127

-------------------------

PISTON WITH JET TESTBEDS

Avro Canada Lancaster X FM209 [Conv] to 2 x RR Merlin + 2 x Orenda jet engines, 1950.
http://neverwasanarrow.blogspot.ca/2009/07/rcaf-jet-lancaster.html
photo - http://www.warplane.com/blog/wp-content/uploads/2010/12/PT2.jpg

SNCASE SE-2010 Armagnac (4 x R-4360) testbed (including the TF-306E of the Mirage IIIV, F2 and G).

UNBUILT

Avro Canada Lancaster X (RR Merlin + Orenda PS-13 Iroquois), 1957
http://www.flickr.com/photos/78215847@N00/4515918663/
 

Apophenia

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LIGHT AIRCRAFT (INCL. MILITARY & EX-MILITARY TRAINERS)

[Conv = conversion, Evol = design evolution]

UNBUILT

Beaver Aircraft Canada Tri-Gull [Evol] turboprop
- Tri-Gull: Allison (R-R) RR250-17B pusher*
-- * Presum same for proposed Viking Tri-Gull prod'n

Bell XV-3 convertiplane (R-985-AN-1 Wasp Jr) [Conv] to turboshaft (1 x 600 shp Lycoming T-53)

CAC CA-25 Winjeel (R-985-AN-2) to turboprop advanced trainer (RR Dart)

Cessna O-2A (2 x IO-360 push/pull) [Conv] to Robertson Aircraft O-2ST (1 x pusher PT6A-27)
-- NB: Some sources say Brico/Robertson O-2ST (below) prototype re-engined with PT6A

Cessna P210 (IO-520) [Conv] to P210T (PT6A)

Colani Pontresina (piston type?) to Colani ?? (turboprop type?) Fliegerrevue 3/1993/p35, Flug Review 5/1985/p46 (photo, 3-view), http://www1.airpics.com/showimg.php?imgid=55148

Composite Aircraft Industries (Pty) SE-86 (piston type ?) to SE-?? (turboprop type?)
JAWA 1986-87/p203

DeHavilland Canada DHC-2 Beaver [Conv] to turboprop
- Vazar Turbine Beaver: 450 shp Allison (R-R) C250-B17F
-- Vazar holds STC for Allison Beaver conv., none done?
- Beaver Aircraft Canada Turbo Beaver, PT6A
-- Beaver alt. was 600hp Orenda Recip OE600A V-8
- [Evol] BAC New Generation Beaver, PT6A-20 or Walter M601E
-- https://www.secretprojects.co.uk/forum/index.php/topic,2697.msg21706.html#msg21706

DeHavilland Canada DHC-3 Otter [Conv] to turboprop
- Beaver Aircraft Canada (BAC) Turbo Otter, PT6A
- [Evol] BAC Super Otter, PT6A-135
-- https://www.secretprojects.co.uk/forum/index.php/topic,2697.msg21708.html#msg21708
- [Evol] BAC Next-Generation Otter, Soloy Dual-Pac PT6A-112s
-- https://www.secretprojects.co.uk/forum/index.php/topic,2697.msg21709.html#msg21709

Legend Turbine Legend Venom [Evol] 750 shp GE H75
- Military variant of Legend Turbine Legend

LET L-200 Morava (2 x Walter M337) [Evol] to unbuilt L-300 (turboprop type?)

Hamilton Aerospace HX-321 pusher (IO-540) or (Allison 250-C20)

Morane-Saulnier MS.502 Criquet (Salmson 9 radial) [Conv] to MS.506 [Turbomeca Astazou]

Neiva IPD-6201 (T-25) Universal (IO-720) to Turbo-Universal (presumably PT6A-34 since Neiva Carajá was a contemporary)

Valmet Vihuri (Bristol Mercury VIII) [Conv] to Mamba-Vihuri (AS Mamba)

Yakovlev Yak-18T (M-14P) [Evol] to [incomplete?] Vertical T-1 (M601B)

Zenith Zodiac CH 601HD (Rotax 912) [Conv] by Scott Ehni (Garrett JFS 100-13A)* [underway]
[* modified gas turbine starter motor]

Zenith Zodiac CH 701 (Rotax 912) [Conv] by Scott Ehni (Garrett JFS 100-13A) [planned]

BUILT

Aérospatiale Epsilon TB-30 (I0-540) [Conv] to prototype Omega TB-31 (364 kW Turboméca Arrius 1A2)

Auster J1 Autocrat (Blackburn Cirrus II) [Conv] to Rover TP.90 (G-AGVI, 1965. 1968 converted back to Cirrus) JAWA 1965-66 (pg 531)

Beech 33/35 Bonanza (IO-520) [Conv] to Propjet Bonanza (Soloy/Tradewind Turbines A36, Allison 250-B17F/2)

Beech B36 Bonanza (IO-520) [Conv] to Turbine Air Bonanza (West Pacific Air, LLC and Rocket Engineering to PT6A-21). L+K 18/1982 (pg 718) and 23/1984 (pg 916)

Beech T-34B (O-470) [Conv] into YT-34Cs (PT6A-25) as prototype [Evol] T-34Cs

Beech T-34A Mentor (E-185) [Conv] to AT-34A Turbine Mentor 420 (420hp Allison 250-B17)
- N4CN c/n G-148 (conversion by Allison/Soloy 1987)

Beech 60 Duke (2 x IO-541) [Conv] to Rocket Royal Turbine (2 x PT6A turboprops)*
- * 550 shp PT6A-21 or PT6A-35 turboprops
- Rocket Engineering, Spokane, WA

Beech 60 Duke (2 x TIO-541) [Conv] to Turbine P-Baron, 2 x 500 shp PT6A-21
- STC holder: Rocket Engineering, Spokane, WA
-- http://www.rocketengineering.com/sites/all/docs/P-Baron_Press_Release.pdf

Beech 60 Duke (2 x TIO-541) to single-turboprop powered Falcon Duke
- Falcon Duke: 1 x 657 shp Walter/Diemech M601D in longer nose*
-- * Wing engines removed, nose baggage compartment eliminated
-- http://www.pilotspost.co.za/arn0000863

Beech 55 Baron [Conv] SFERMA SF-60 Marquis, 2 x 523 shp Turboméca Astazou turboprops

Beech 55 Baron or Travelair [Conv*] to Hall WH-4 Harpoon (M601D)
[* from components, could be considered a total rebuild/evolution]

Beech 55 Baron (IO-470s) [Conv] Turbine Solution conversion (M601)

Beech 55 Baron (IO-520s) converted to American Jet Industries "Turbo Star Baron" (Allison 250-B17s)

Beech 58P Baron (2 x IO-520s) to Model 38P "Turboprop Lightning" (TPE 331-9 then PT6A-40)

Beech 95 Travel Air (2 x IO-360) [Conv] to Beechcraft-SFERMA PD-146 (Turboméca Astazou), 1960
- aka Turbo-Travel Air, becoming [Evol] Beechcraft-SFERMA PD-146 Marquis, 1961

Boeing Stearman Model 75 [Conv] by Sam Burgess (PT6A, built? unbuilt?) FRW 4/1992 (pg 85)

Boulton-Paul P.108 Balliol prototype (VL892, Mercury 30) [Evol] into finalized Balliol T.Mk 1 (VL917 and VL935, AS Mamba*) http://1000aircraftphotos.com/APS/1962L.jpg

[* Note: production Balliol T.Mk 2 reverted to piston (Merlin 35)

Bücker Bü-133 (Siemens Sh 14A-4) [Conv] to turboprop (Allison 250)
FLUG REVUE 1/1992 & 4/1992

Brokaw Bullet (IO-520) [Conv] to turboprop (TPE 331) then back to piston

Cessna 195 [Conv] to TPE 331 (Brazilian 'Cessna 195-T' conversion, PT-ZPN)

Cessna 205/206/207 [Conv] MacAvia Turbine (207) and Soloy (RR Allison 250),

Cessna 207 [Conv] Turbine Solutions (M601)

Cessna P210 (IO-520) [Conv] to O&N Silver Eagle (RR Allison 250)

Cessna 336* (2 x IO-360) 1968 [Conv] to single-engined Conroy Stolifter
- Conroy Stolifter: 1 x 575 shp Garrett TPE331-25A tractor turboprop**
-- 1 x built (N1414G), aka STOLifter, aka 'Stol-Lifter' (sic)
-- * Some sources list as 'Cessna 337' (but note fixed u/c)
-- ** Rear engine removed, fuselage extended with cargo bay

Cessna O-2 Skymaster (2 x IO-360) 1969 [Conv] to twin turboprops
- O-2T/O-2TT (N6304F, 337-0304): Pistons repl. with 2 x Allison 250s
-- http://www.337skymaster.com/messages/attachment.php?attachmentid=215&d=1083881055

Cessna 337* (2 x IO-360C) 1983 [Conv] to single-engined Spectrum SA-550
- Spectrum SA-550: 1 x 550 shp P&WC PT6A-27 pusher, no nose engine
-- * Prototype conv. was Riems-Cessna FTB337G (N337BF c/n 0061)
-- Project bought by Basler, N33BF becomes Turbo 34 (below)

Cessna 337 (2 x IO-360C) 1983 [Conv] to single-engined Basler Turbo 34
- Basler Turbo 34: 1 x 550 shp P&WC PT6A-27** pusher, aka Spectrum SA-550
-- http://www.opshots.net/gallery2/photos_cache/41483_800.JPG
-- ** Aero News Network says engine was PT6A-60A (1,050 shp ??)
-- NB: Flight Global's revived 'Basler Turbo 37' seems to be a typo
-- https://www.flightglobal.com/news/articles/basler-turbo-37-returns-to-the-market-40861/

Cessna 337M (2 x IO-360) 1982-83 [Conv] to Brico/Robertson O-2ST*
-- * ST for 'Single Turboprop' (nose cap replaced front engine)
- O-2ST: Initially 1 x pusher 700 hp Allison 250‑C30 turboprop
- O-2ST: Re-engined with 700 hp P&WC PT6A
-- For Saudis; aka O-2ST SandCrab, aka Desert Utility Aircraft
- https://www.flightglobal.com/pdfarchive/view/1983/1983 - 0383.html

Cessna 337 (2 x IO-360C) 1983 [Conv] to single-engine by Soloy Conversions
-- [??] Same as O-2ST (Soloy provided Turbine Pac gearbox for O-2ST)
-- NB: Soloy refs say 650 shp, O-2ST refs usually say 700 shp

Cessna 337 2001 [Conv] to Groen RevCon 6G autogyro (1 x tractor RR 250-B17F2)
-- Prototype N9112A, aka Hawk 6G, tech demonstrator for Groen Hawk 4T

Cessna 340 (IO-520) [Conv] Turbine Solutions (M601), [Conv] Riley Prop 340
Flug Review 3/1988/p48

Cessna 402 (2 x O-520) 2005 [Conv] to single-engined Falcon 402
- Falcon 402: 1 x 657 shp Walter/Diemech M601D in longer nose*
-- * Wing engines removed, nose baggage compartment eliminated
-- Pretoria-based DMI Engineering (Pty) Ltd begat Falcon Air
-- http://www.pilotspost.co.za/arn0000863
-- http://i1177.photobucket.com/albums/x355/CanberraRSA/RSA2012/02-13Feb12-FALA/ZU-MDI_13Feb12-FALA.jpg

Cessna 421 Golden Eagle (IO-520) [Conv] to PT6A-112s

Cirrus VK-30 (IO-550) [Evol] to Cirrus (Israviation) ST-50 (PT6A) Flug Review 10/1992/p6 (photo) and 7/1993/p48, JAWA 1993-94/p470 http://www.eaa1000.av.org/fltrpts/st50/st50.htm

Currie Wot (G-APWT, Walter Mikron) [Conv] to "Jet Wot" (Rover TP.60, then TP.90).
JAWA 1960-61 (pg 47)

DeHavilland Canada DHC-1 Chipmunk [see separate DeHavilland entry]

Enaer T-35 Pillán (IO-540) [Evol] into T-35DT (T-35XT) and T-35T Aucan (420shp 250-B17D)

Fuji T-3 or KM-2 (IO-490) [Conv (prototype)/Evol] into T-5 or KM-2Kai (Allison 250-B17D)

Globe Swift (IO-360) [Conc] to LoPresti Swiftfire (N23368, Allison 250-B17C) then back to IO-360.

Great Lakes 2T-1A (IO-360) [Conv] to Doug Champlin X2T-1T (Allison 250).
(http://www.airbum.com/pireps/PirepGreatLksTrbn.html)

Hamilton Aerospace HX-321 (IO-540) [Evol] or Allison 250-C20 pusher

Lake Amphibian "Sea Wolf" LA-27 (IO-540) [Conv] to (turboprop type?)

Lancair IV-P (IO-550) [Conv/Evol] to IV-P turbine/PropJet (PT6-135A or M601D/E)

Lancair Legacy [Conv] (Continental IO-550-N) to 850 shp PT6A-42
- Legacy Turboprop 'Turbulence', N707MM, by Mike Patey

Legend Legend (GM LSA V-8) [Evol] to Turbine Legend
- Turbine Legend: 1 x 720 shp Walter M601
- Turbine Legend: 1 x 1,070 shp Garrett TPE331-10
-- aka 'Garrett Legend'
-- https://www.innovativewings.com/turbine-legend-garrett/

Maule M-7 (IO-540) [Evol] to M/MX-7-420 Starcraft (Allison 250-B17)

Max Holste MH-152 [Conv] to MH-153 Turboméca Astazou II testbed, 1959

Max Holste MH.1521 Broussard (R-985-AN-1 Wasp) [Conv] to Walter M601
- Cascade Aircraft Conversions for Scott Baker, Chemainus, BC
-- http://cascadeaircraftconversions.com/engineeringsolutions.html
-- http://cascadeaircraftconversions.com/images/328_Broussard_2_crop.jpg
-- Appears to use Cascade's Turbo-Thrush M601E conv. kit

Mooney M30 (301 prototype, IO-540) [Evol] into Socata TBM700 (PT6A-64)

NDN NDN-1 Firecracker (IO-540) [Evol] into NDN-1T Turbo Firecracker (550 shp PT6A-25A)

Nord 1102 Noralpha [Conv] to SFERMA N-1110 Turboméca Astazou testbed, 1959

North American T-28 (Wright R-1300) [Conv] into NA-284/RS-28/YAT-28E (Lycoming YT-55L)

North American T-28 (Wright R-1300) [Evol/Conv] into AIDC T-CH-1 Chung Hsing (T53-L-701).

PAC CT-4B Airtrainer (NZ1940, IO-360) [Conv] into prototype CT-4C (Allison 250-B17D)

Pilatus PC-3 (Lycoming GO-435) [Conv] into PC-3-06 (PT6A-20) to form PC-7 prototype

Piper (Smith) PA-18 Super Cub (O-320) [Conv] to PA-18T (205 shp Innodyn 205TE)

Piper PA-31P Navajo (IO-540) [Conv] to GM 17 Viper (M601E)

Piper PA-31 Navajo/Chieftain [Conv] to Schafer Comanchero (PT6A), Turbine Solutions (M601)

Piper (Embraer EMB 820C) Navajo [Conv] to twin 550 shp PT6A-27 turboprop
- Neiva Carajá: Brazilian factory EMB 820C turboprop conversions

Piper Navajo Chieftain (2 x IO-540) 1989 [??] [Conv] to twin turboprop
- Soloy Navajo: 2 x 500 shp Teledyne Continental Motors TP-500
-- NB: 1982 Piper Cheyenne testbed for TP-500 (portside) + stbd PT6A

Piper Malibu/Mirage (IO-540) [Conv] to JetPROP DL/DLX*
- Rocket Engineering, Spokane, WA
- * JetPROP DL : 550 shp PT6A-21 (DL Roman numerals for 550)
- * JetPROP DLX: 560 shp PT6A-35 (DLX Roman numerals for 560)

Piper Malibu Maxima (IO-520) [Conv] Turbine Solutions (M601)

Procaer/General Avia F15F Delphino (IO-520) [Evol] to turboprop (type?) JAWA 1985-86/p161

PZL Warszawa-Okecie PZL-104 Wilga conversions

PZL-104 Wilga [Conv] 2014, 1 x 760 shp Walter M601-B8
-- Avia V508 three-blade propeller, 1m fuselage extension
-- https://www.gonzoaviation.com/AwEshop2UserFiles/image/documentimage/wilga turbo 640.JPG

PZL-104MA Wilga 2000 [Conv] PT6A-28 (420-680 shp reported)
-- N123T 'Draco' aka Turbine Wilga, by Mike Patey
-- http://cessnateur.blogspot.com/2018/07/draco-mike-pateys-incredible-pzl-104.html

PZL Warszawa-Okecie PZL-130 Orlik (Vedeneyev M-14P) [Evol] into PZL-130T Turbo Orlik (PT6A-25) and PZL-130TM Orlik (M601E).

PZL-Mielec M-26 Iskierka (6A-350/IO-540) turboprop rumoured (Air Int'l June '85 Vol28 No6)

Rand Robinson KR-2 (VW, Continental C-85, etc.) [Conv] to KR-2T (Garrett JFS 100-13A)*
[* modified gas turbine starter motor]

RFB Fantrainer 150 (NSU Wankel) [Evol] into Fantrainer 400/600 (Allison 250)

SFERMA Turbo-Travel Air [Conv] Beech Travel Air to 2 x 440 shp Turboméca Astazou I, 1960
- aka Beech-SFERMA Turbo-Travel Air

SFERMA PD-146 Marquis [Conv] revised Turbo-Travel Air prototype (with Baron tail surfaces), 2 x 530 shp Turboméca Astazou II,
- aka Beech-SFERMA PD-146 Marquis

SFERMA SF-60 Marquis [Conv] Production version of PD-146 Marquis, 2 x 523 shp Turboméca Astazou IID, 8 built from Beech-supplied parts
- aka Beech-SFERMA SF-60 Marquis Baron
- No.2 re-engined with 630 shp Turboméca Astazou IIX for record-breaking purposes, 1964

SFERMA SF-60A Marquis [Conv] revised Turbo-Travel Air (with Baron tail surfaces), 2 x Astazou IIJ, [number built ?]

SIAI Marchetti SF-260C (IO-540) [Evol/Conv] into SF-260TP (250 B-17D)

Stoddard-Hamilton Glasair III (IO-540) [Conv] (Allison 250)

Sukhoi Su-26 (M-14P radial) [Conv] to Su-26T (M601)

Technoavia SM-92 Finist (M-14P radial) [Evol] to SM-92T Turbo-Finist (M-601E)

Valmet L-70 Vinka (IO-360) [Evol] into L-80 TP and L-90 (Allison 250)

Van's RV-4 (IO-360, etc.) [Evol] to RV-4T (Innodyne 205TE)

Windecker Eagle (IO-520) to Windeagle Turboprop (PT6A)
JAWA 1985-86/p395, JAWA 1982-83/p357 F+T, http://www.flightglobal.com/articles/1999/04/28/50605/windeagle-wins-first-order-for-turboprop.html

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Apophenia

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MILITARY PISTON-TO-TURBOPROP (other than dedicated Trainers)

[Conv = conversion, Evol = design evolution]

UNBUILT

Blackburn B.48/YA-1 Firecrest (Bristol Centaurus) [Evol] to Blackburn YA-6 (mockup, RR Clyde)

Breguet Br-761 Deux Ponts (R-2800s) [Evol] into Br.766 and Br.767 with British turboprops [types?]

Cessna XL-19A Bird Dog (O-470) [Conv] to Cessna XL-19B/C (Boeing XT50-BO-1) JAWA 1960-61/p278, JAWA 1954-55/p221 (photo) [XL-19B set light aircraft altitude record, 37,063 ft, 05 Nov 1952.]

Consolidated B-32/Model 34 (4 × Wright R-3350) [Conv] to 4 x turboprop
- B-32 turboprop: Oct 1944, 4 x 2,300 shp General Electric TG-100/XT31s
-- Project abandoned because GE engines could only produce 1,700 shp
-- http://www.secretprojects.co.uk/forum/index.php/topic,27442.msg284491.html#msg284491

FMA I.A. 30 Ñancú (RR Merlin 604s) [Evol] into turboprop (?Confirmation?)

FMA (DINFIA) I.A.35 Huanquero (IAR 19 radials) [Evol] to turboprop "Constancia II" transport, evolved into Guaraní I (Bastán III-A)

Lockheed P2 Neptune (R-3350s) [Evol] to Lockheed CL-1046 (quiet turboprop deriv)
Lockheed Aircraft since 1913/p478

Lockheed P2V-7 (N7060X) [Conv] to Hawkins & Powers 'turbine Neptune' (Allison T-56-A-14s, N138HP) "incomplete, project on hold." http://www.ruudleeuw.com/greybull-rp-may03.htm

Max Holste MH.1521 Broussard (R-985-AN-1 Wasp) [Evol] to MH.270 (Armstrong P182).

Max Holste MH.1521 Broussard (R-985-AN-1 Wasp) [Evol] to MH.280 (Lycoming T-53).

Messerschmitt Me 264 [Evol] turboprop projects - 2 airscrews driven by one 6000hp synth-fuel steam turbine, or 2 x 5440 shp BMW 028 turboprop.
"Die deutsche Luftrüstung 1933-45" by Nowarra, vol 3, page 234 (ISBN 3763754679)

Partenavia P68 Observer (IO-360) [Evol] into P68T Observer (Allison 250) pitched to Italian Army

SIAI Marchetti SM-92 (DB.605A) [Evol] postwar to twin turboprop (Armstrong-Siddeley Mambas).

SIPA S.1100 (P&W R-1340) [Evol] planned turboprop version (Turboméca Bastan).

Vickers Type 461 Windsor (RR Merlin 85) [Evol] to Type 601/B.Mk II (RR RB.39 Clydes)

BUILT [Conv = conversion, Evol = design evolution]

Federal Aircraft Factory (F+W) C-3603 (Saurer HS-12Y-51) [Conv] to C-3605 (Lycoming T53)

Ilyushin Il-10 (1 x Mikulin AM-42 V-12) [Conv] to turboprop (1 x Ivchenko AI-20)
-- Two Chinese conversions for PLAAF
http://www.secretprojects.co.uk/forum/index.php/topic,14038.msg138081.html#msg138081

Lockheed R7V-1 Super Constellation (4 x R-3350-91s) [Conv*] to R7V-2 (4 x P&W YT34-P-12As)
[* 4 x R7V-1s converted while still on the production line]

Lockheed R7V-1 Super Constellation (4 x R-3350-91s) [Conv*] to YC-121F (4 x P&W YT34-P-6s)
[* 2 x R7V-1 conversions. One YC-121F briefly converted to Allison 501Ds as Lockheed TB]

Lockheed P-2V Neptune (R-3350s) [Evol] to Kawasaki built P-2V-Kai/P-2J (GE T64s).

Max Holste MH.250 'Super Broussard' (R-1340) MH.260 Super Broussard (Turboméca Bastan IV)

North American Mustang conversions
- Australian (RR Dart, unflown, reconverted to Merlin)
- Cavalier Turbo Mustang III (RR Dart 510)
- Piper PA-48 Enforcer (Lycoming YT55-L-9)

North American AJ-2 Savage (R-2800s + Allison J33) [Evol] into prototype A2J Super Savage (5035 shp Allison T40s [conjoined T38s driving contraprops], no tail J33).

Ryan FR-1 Fireball (R-1820 + J31 turbojet) [Evol] to XF2R-1 'Dark Shark' (GE XT31 + J31)

Short S.38 Sturgeon (2 x R-R Merlin 140) 1949 [Evol] to Short S.B.3 ASW a/c
- (2 x 1,147 shp AS Mamba AS Ma3 turboprops)

Sud Aviation SE.116 Voltigeur (R-1300-C7BA1 Cyclone-7) 1st prototype [Evol] into 2nd prototype (Turboméca Bastan)

Tupolev Tu-4 Bull (4 x Shvetsov ASh-73s) [Conv] into Kong Jiang-1, etc. (Zhuzhou Wojiang-6)

Westland W.34 Wyvern prototypes/TF Mk 1 (RR Eagle 22) [Evol] to W.35 Wyvern TF.Mk 4/S.Mk 4 (Armstrong Siddeley Python)

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Apophenia

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---------------
PISTON-TO-TURBOPROP -- TRANSPORTS (CIVILIAN & MILITARY), WATERBOMBERS, ETC.

[Conv = conversion, Evol = design evolution]

UNBUILT

[Note: Most 1944 UK Brabazon Committee civil Types were intended as Mark 1 recips but evolved into Mk.II turboprops: these were Type I (Brabazon), Type IIA (Ambassador, which remained pistoned engined), Type IIB Viceroy/Viscount, Type III Britannia, Type IIIC Tudor, and Type VA Marathon (flown with AS Mambas). The Marathon has been listed as a testbed. The others have been listed here as unbuilt ... either in their planned piston-engined form or in their intended turboprop evolutions.]

Aermacchi MB-331 (piston engine type?) and MB-331T (turboprop type?) STOL transports
http://www.secretprojects.co.uk/forum/index.php?PHPSESSID=84d64c18713040c1723cc97677693276&topic=872.15

Agusta-Zappata AZ-1 (2 x piston type?) to (turboprop type?) JAWA 1954-55/p161

Airspeed AS.57 Ambassador Mk.I (2 x Centaurus) [Evol] into Mk.2 (4 x AS Mambas)

Airspeed AS.57 Ambassador Mk.I (2 x Centaurus) [Evol] into AS.68 Ambassador (2 x Proteus)

Avro 689 Tudor (4 x Merlin 621s) [Evol] into Mk.II (4 x Theseus)

Beech 65-80 Queen Air (IGSO-540) [Conv/Evol] to turboprop (2 x Allison 250s or Boeing T60s).

Beech Model 120 [Evol] pressurized Queen Air with turboprops (2 x Turbomeca Bastan)

Breguet Br.766 and Br.767, "Deux-Ponts" [Evol] with British turboprops (type/s?)

Bristol T.167 Brabazon Mk.I (coupled Centaurus) [Evol] into Mk.II (coupled Proteus)

Bristol T.175 Britannia (4 x Centaurus) [Evol] into Britannia 100 (4 x Proteus)

Britten-Norman BN-2A Trislander (3 x O-540s) [Conv] to Integrity Aircraft (1 x tail TPE 331)
http://www.flightglobal.com/articles/1999/08/25/55417/commercial-aircraft-directory-part-1.html

Britten-Norman (Pilatus) Trislander (3 x O-540s) [Evol] (turboprop type?)

Canadair North Star (4 x Merlins/R-2800) [Evol] into CL-35 for TCA (4 x RR Dart RD5s)

Consolidated PBY-5A/Canso (R-1830s) [Conv] by Field Aviation (turboprop? unbuilt?)

Consolidated PBY-5A (R-1830s) [Conv] to turboprop study, late '90s
- Study by Len Curreri (abandoned for new-built ClipperSpirit Project)

De Havilland DH 104 Dove (Gypsy Queen) [Conv] to 2 x 636 shp Astazou X, see Riley Turbo Executive

Dominion Skytrader 800/UV-23A Scout (prototype, IO-720-C) planned [Conv] (Turboméca Astazou XVIs), planned [Evol] into Skytrader ST-1700 Conestoga (PT6A-42s)

Dornier Do 28C [Evol] Do 28A/B deriv with 2 x 530 shp Astazou II turboprops + revised nose
http://www.secretprojects.co.uk/forum/index.php/topic,1911.msg187255.html#msg187255

Dornier Do 24T-3 (Bramo 323) [Evol] into post-war Do-24/72 (3 x Avco-Lycoming T53-21, option for 3 x PT6A-50 or Turboméca)

Douglas DC-6, DC-6B, or DC-7 [Conv] into Aviation Traders Carvair (optional RR Darts) JAWA 1965-66/p129 (also see DC-4M [Evol] into Dart-powered Canadair CL-35, above)

Douglas DC-7 turboprop [Evol] DC-7D (R-R Tyne or Allison ?) and/or DC-7T (R-R Tyne MkI or MkII)

http://www.secretprojects.co.uk/forum/index.php?PHPSESSID=a08e7666221b71b06c589e7c7b47bc9d&topic=5102.msg40500#new

Fairchild C-119C/G/J [Conv] to Turbo Boxcar (Allison T56-A-7s) Wright Paterson feasibility study
http://www.secretprojects.co.uk/forum/index.php?topic=889.0

Fairchild C-123 Provider [Evol] into follow-up concept (4 x 2800 shp GE T64s)
http://www.theaviationzone.com/factsheets/c123.asp

Fairchild C-123 Provider [Conv] to turboprop (engine type unspecified)
-- 1990s proposal by JV betw. US Maryland Air Industries and Bulgarian Novecon
Source: Fliegerrevue, Feb 1993 (p.56)

Fairchild C-123 Provider [Conv] to turboprop (2 x Allison T56A-7 or T56A-15)
-- Conv. by Provider Aviation Services Inc begun Apr 2000, aband. mid 2004 (?)
http://www.oldwings.nl/content/c123t/c123t.htm

Fairchild C-123 Provider [Conv] to C-123T turboprop (2 x Rolls-Royce T56-A-15)
-- 2010 proposal by JV betw. US Fleetwings Aircraft Company and RSA Elmer Group
http://home.janes.com/events/exhibitions/aad2010/sections/daily/day2/sturdy-provider-for-afric.shtml
-- NB: SA Flyer reported that Fleetwing had neg. with Denel to do local work
http://www.saflyermag.co.za/index.php/about/archive-article-list/109-aad-report-2010.html

Fairchild (Canada) F-11 Husky (550 hp Alvis Leonides) [Conv] to Vazar Turbo Husky (750 shp PT6A-135)
http://web.archive.org/web/20121022025056/http://vazar.com/fairchild-husky-aircraft-project.html

Grumman HU-16B (Wright R-1820) [Conv] to Conroy Turbo Albatross
- Conroy Turbo Albatross: 2 x 1,740 ehp RR Dart RDa.6 Mk 510*
-- * Rolls-Royce Dart engines and cowlings from Viscount 700
-- HU-16B conv. to be identical to HU-16A conv., N16CA (qv)
-- Jane's All the World's Aircraft 1972-73, Ed. John WR Taylor

Grumman G-64/G-111 Albatross (R-1820-76s) [Evol] to G-xxx (4 x PT6A)
http://www.secretprojects.co.uk/forum/index.php?PHPSESSID=da302984a75066a70bb923add62dd39a&topic=1115.0

Grumman Albatross (Wright R-1820) [Conv] to four engines
- Grumman air tanker conv. for Chile (??turboprops??)

Grumman Albatross (Wright R-1820) [Conv] to Frakes turboprop
- Frakes proposal: 4 x 1,000 shp Pratt & Whitney Canada PT6As

Grumman Albatross (Wright R-1820) [Conv] to 4 x TPE turboprop
- Unknown origin: 4 x 1,100 shp Garrett TPE331,* mid-'90s?**
-- * American Flying Boats and Amphibious Aircraft, pg 243
-- ** Flying, Aug 1994: Chalks G-111s to be TPE331-powered

Grumman Albatross (Wright R-1820) [Conv] to G-111AT Wildfire*
- G-111AT Wildfire: 2 x 1,650 shp Honeywell TPE331-14GR/HR
-- * Marsh Aviation devel. for Wildfire Aircraft LLC
-- Marsh Aviation Wildfire is intended for the water bomber role

Grumman Albatross (Wright R-1820) [Conv] to Albatross Air HU16 LLC G-111(T)
- G-111(T): 2 x 750 shp* P&WC PT6A-29 turboprops or alternatives**
-- * Comparatively low shp makes this project rather unconvincing
-- ** Alternatives Honeywell/Garrett TPE331 or unspecified "G.E."

Grumman Albatross (Wright R-1820) [Conv] to NNC turboprop
- 1999 study (abandoned for new-built ClipperSpirit Project)


Grumman C-1A Trader - planned Turbo Trader [Conv] for Brazil (2 x TPE331)

Lockheed turboprop Super Constellation design studies (led to piston L1649A Starliner)
- L1469 (6000-shp P&W PT2F-1s)
- L1569 (Allison 501s)
- Lockheed L1649B (? turboprop L1649A) Lockheed Aircraft since 1913/p393

Miles HDM 106 Caravan (mockup used HDM.105 parts) to turboprop (eventually Short SC.7) Brown: Miles Aircraft since 1925/p356

On Mark Model 450 [Evol] refined Douglas B-26 exec. transport (2 x 3750-4000 shp Allison 501-D13/D15)
http://www.flightglobal.com/pdfarchive/view/1957/1957%20-%200936.html -- Jane's 1957-58

Riley Turbo Executive (250 hp Gipsy Queens) [Conv] DeHavilland DH 104 Dove to , 2 x 636 shp Astazou X, planned flight 1964

Saab 108-1 MULAS (4 x TIARA T6-320), 108-2, '-3, and '4 with twin turboprops (PT6A-41s)
http://www.secretprojects.co.uk/forum/index.php?PHPSESSID=84d64c18713040c1723cc97677693276&topic=872.0

Short PD.15 transport (4 x Leonides?) to (turboprop type?) Shorts Aircraft since 1900 p466 + p500
http://www.secretprojects.co.uk/forum/index.php?topic=872.msg10585

Short PD.16 transport (4 x piston?) (2 x Bristol Proteus 755) Shorts Aircraft since 1900/p467+p499+p500 http://www.secretprojects.co.uk/forum/index.php?topic=2105.msg20357

Scottish Aviation Twin-Pioneer [Evol] into Turbo-Pioneer (2 x RR Darts, retractable gear, ramp, etc.)

Vickers VC2 Viceroy (2 x Centaurus) [Evol] into VC2 Viscount (4 x RR Darts)

BUILT

Antonov An-2 (ASh-62) [Conv] to An-3/An-3T (940 shp TVD-10 then 1450 shp TVD-20)

Beech 18 (R-985) [Conv] to Volpar VTB-18 Turboliner (TPE 331s or PT6As).

Beech 18 (R-985) [Conv] to Ed West/Hamilton Westwind (engine types vary)
- Westwind I (tricycle undercarriage conversion, PT6A-6, 'A-20, 'A-27)
- Westwind II (tricycle undercarriage, stretched fuselage, PT6A-6, 'A-20, 'A-27)
- Westwind III (original tail-dragger config., PT6A-20, 'A-27, or Lycoming LTP-101 [N432U])
- Westwind IV (tricycle undercarriage, single fin, PT6A-28, 'A-34, 'A-45, or Lycoming LTP-101)

Beech 18 (R-985) [Conv] to Aircraft Industries Inc. (Quebec) Jobmaster (PT6A-20s)
- 1965/66 prototype conversion by Dee Howard, only one other Jobmaster conversion.

Beech 18 (R-985) [Conv] to Beech-SFERMA PD-18-9 (2 x Turboméca Bastan III)

Beech 65-80 Queen Air/L-23F (IGSO-540) [Conv] to P-o-C Model 87 Queen Air/NU-8F (PT6A-6s).

Beech 88 Queen Air (IGSO-540) [Conv] to P-o-C prototype Model 99 (stretched and PT6A-20s).

Beech 88 Queen Air (IGSO-540) [Conv] on production line to King Airs (PT6A-20s).

Beriev Be-30 (prototype, Shvetsov ASh-21s) [Conv] to turboprops (Glushenkov TVD-10s)

Boeing B377 (R-4360s) [Conv] to Aero Spacelines 377MGT Mini Guppy Turbine (Allison 501/T56s)
Boeing B377 (R-4360s) [Conv] to Tracor Aviation 377SGT Super Guppy Turbine (Allison T56-501-D22Cs)
[Also C-97 test-beds for Douglas C-133 (with P&W T34-P-7s)]

Britten-Norman BN-2 Islander (IO-360/IO-540) [Evol] to BN-2T Turbo Islander (Allison 250)

Canadair (Bombardier) CL-215 [Conv] to CL-215T and [Evol] to CL-415.

Consolidated PBY-5A "Canso" (R1820s) [Conv] by Trans-Caribbean (turboprop type?).

[Convair CV-240 conversions/evolutions listed separately]

[DeHavilland/DeHavilland Canada conversions/evolutions listed separately]

Dornier Do 24T-3 (3 x Bramo 323) [Conv] to re-winged Do 24 ATT (3 x PT6A-45s)

Dornier Do 27 Q4 (Lycoming O-470-K) [Conv] to Do 27 T1 (Turboméca Astazou)

Dornier Do 28 (IO-540) [Conv] to re-winged Dornier TNT (TPE 331), Do 28-5X TurboSky prototype (Lycoming LTP 101-600-1A then PT6A-110), and [Evol] production Do 128-6 Turbo Skyservant (PT6A-110).

Dornier Do 28 (IO-540) [Conv] by Aerotech Slovakia (Walter M601Ds)

[Douglas DC-3/C-47 conversions listed separately]

Embraer N-821 Caraja (PT6A-27) [Evol] from Piper PA-31-50 Navajo Chieftain (IO-540).

Fairchild C-123B (R2800s) [Conv] to turboprop C-123T (T56-A-7) for Royal Thai AF
-- 1 x conv (56-4357) by Mancro Aircraft Company (Thai upgrade canc. due to cost)
http://web.archive.org/web/20090504234722/http://www.oldwings.nl/content/c123t/c123t.htm

Grumman G-21 Goose (R-985s) [Conv] to G-21T Turbo Goose (TPE 331 or PT6A-27s, McKinnon and Marshall)

Grumman G-73 Mallard [Conv] to Northern Consolidated testbed (1 x R-1340, 1 x PT6A-6)

Grumman G-73 Mallard (2 x R-1340) [Conv] to Frakes G-73T Turbo Mallard (2 x PT6A-27s)

Grumman HU-16A (Wright R-1820) [Conv] to Conroy Turbo Albatross
- Turbo Albatross: 2 x 1,740 ehp* RR Dart RDa.6 Mk 510**
-- * Some sources say 1,535 shp Mk 510/511, others 2,280 shp
-- ** Rolls-Royce Dart engines & cowlings from Viscount 700
-- 1970 prototype conv. N16CA (G-077, 51-0004 ex-USAF SA-16A)
-- Jane's All the World's Aircraft 1972-73, Ed. John WR Taylor
-- http://www.allaboutguppys.com/cl44/barry_scrap/turbo_albatross.jpg
-- https://c1.staticflickr.com/5/4145/4991266073_e166edec92_b.jpg

Grumman S-2 Tracker - [PT6 Conv] Conair Turbo-Firecat (PT6A-6AF), IMP (PT6A-67CF)

Grumman S-2 Tracker - [TPE331 Conv] Northrop Grumman S-2T (TPE331-15AW), Marsh TurboTracker (TPE331-14GR), Israel Aircraft Industries S-2UP (using Marsh TPE331 kits).

Handley Page HP.81 Hermes IV (Hercules) [Evol] to HP.82 Hermes V (Bristol Theseus).

Handley-Page HPR.3 Herald (prototypes 4 x Leonides Majors) [Conv] to HPR.7 Herald (2 x Dart R.Da.7s)

Harbin (HAMC) Y-11 (Housai HS-6/AI-14R) [Evol] to Y-11T/Y-12 (PT6A-11, later 'A-27)
[PT6A-11s exchanged for 7 x unused JT15D-4 intended for unbuilt Chinese biz-jet design]

Lockheed R7V-1 Super Constellation (4 x R-3350-91s) [Conv*] to R7V-2 (4 x P&W YT34-P-12As)
[* 4 x R7V-1s converted while still on the production line]

Lockheed R7V-1 Super Constellation (4 x R-3350-91s) [Conv*] to YC-121F (4 x P&W YT34-P-6s)
[* 2 x R7V-1 conversions. One YC-121F briefly converted to Allison 501Ds as Lockheed TB]
http://1000aircraftphotos.com/Contributions/4701.htm

Partenavia P68 (I0-360) [Evol] into Partenavia AP68T (Allison 250)

Piaggio P166 (Piaggio-Lycoming GSO-480) [Evol] to P166T/P.166DL3 (Lycoming LTP 101-700) [Conv] to P166DP-1 (c/n 465 & 466 with PT6A-121s).

Pilatus PC-6 Porter (Lycoming IGO-540) [Conv] into PC-6/A Turbo-Porter (Turboméca Astazou) and [Evol] into PC-6/B Turbo-Porter (PT6A) and PC-6/C Turbo-Porter (TPE 331)

Piper PA-31 Navajo (2 x IO-540) [Conv] into P-O-C PA-31T Cheyenne prototype (2 x PT6A-20).

Piper PA-31-50 Navajo Chieftain (IO-540) [Evol] into PA-31T Cheyenne (PT6A-28).

Piper Aerostar (2 x Lycoming TIO-540) [Conv] to Speedstar 850
- Airplane Factory LLC Speedstar 850: 1 x Garrett TPE331 in nose
-- http://www.airliners.net/photo/Airplane-Factory-Speedstar/1759914/M/

Republic Seabee (Franklin 6A8) [Conv] to Turbine Seebee, 1 x derated 400 shp PWC PT6A-20 pusher
- Turbine Seebee prototype conversion C-GNVS (s/n 465), aka 'Sea Hornet'

Republic Seabee (Franklin 6A8) [Conv] to Turboprop Seabee 1 x 523 shp Turbomeca Astazou II L,
- Turboprop Seabee conversion CF-MYT (s/n 1025), completed 1980, first flown 1982

Rockwell Aero Commander 680E (IO-540) [Conv] by PAC to 680T (2 x PT6A-20).

Rockwell Aero Commander 680FL/680P (IO-540) [Evol] into 680T (TPE 331)

Short SC.7 Skyvan Series 1 prototype (IO-520s) [Conv] to Turboméca Astazou IIs.

Swearingen SA26 Merlin (2 x Lycoming TIGO-540) [Conv] to SA26-T Merlin IIA (2 x PT6-20).

------------------
 

Apophenia

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PISTON-TO-TURBOPROP -- AGRICULTURAL AIRCRAFT

[Conv = conversion, Evol = design evolution]

UNBUILT

CAC CA-25 Winjeel trainer (R-985) [Evol] into agricultural derivative (PT6A) -- proposed follow-on to CAC CA-28 Ceres.

Hindustan HA-31 Basant II (IO-720) [Evol] into turboprop version (type?)

Transavia PL-12 Airtruk (6-320) [Evol] into PL-12-550T (PT6A)
Jane's All The World's Aircraft, 1984/85.

TURBOPROP [UNBUILT]-TO-PISTON

Rutan Model 59 Predator planned with turboprop (type?) [Evol] into Model 120 (IO-720)

BUILT

Air Tractor AT-301 (R-1340) [Evol] into AT-400 (PT6A-15AG)/AT-400A (PT6A-20).
Air Tractor AT-401 (R-1340) [Evol] into AT-402 (PT6A-11AG).
Air Tractor AT-501 (R-1340) [Evol] into AT-503 (PT6A-45R).

Air Tractor AT-300/AT-400 (R-1340) [Conv] by Cascade (M601)

Aero Commander Ag Commander S-2D (P&W R-1340) to PT6A
- Turbo Ag Commander S-2D(T)

Aero Commander S2R Thrush (P&W R-1340) [conv] to turboprop
- S2R-T Turbo Thrush: Marsh conv. to 750 shp TPE331-1-101
- S-2 Thrush [conv] Serv-Aero Engineering Inc, (PT6A ?)

Ayres Thrush S-2A/S-2C-600 (R-985/R-1340) [Evol] into S-2R-T (PT6) and [Conv] into Marsh S2R-T Turbo Thrush (TPE 331) and Johnson Airspray S2R-T (M601).

Ayres Thrush [Conv] into S2R-T, Cascade Aircraft Conversions to 751 shp Walter M601 E-11, Avia 3-blade prop
-- Note: JAS Ultra Thrush and Johnson Airspray conv. all from Cascade Aircraft Conversions' kits
-- http://cascadeaircraftconversions.com/thrush.html

Ayres Thrush [Conv] into S-2R ; Serv-Aero Engineering conversion [turboprop type unknown]

Grumman Ag-Cat Super B/600 (R-1340) [Evol] into G-164D Ag-Cat Super B Turbine (PT6A-11/ -15/ -34AG), [Conv] into Frakes Turbo-Cat (PT6A-34), Marsh Turbo-Cat (TPE 331), Page Ag-Cat (Lycoming LTP-101), and Sky Tractor (M601).

PAC Fletcher FU-24 (IO-470) [Evol/Conv] to PT6/TPE 331 and [Conv] M601

PZL-Okecie PZL-106A Kruk (PZL-3S/SR radial) [Conv] into PZL-106AT Turbo Kruk prototype (PT6A-34AG), [Evol] into production PZL-106BT (M601) and PZL-106BTU-34 Turbo Kruk (PT6A-34)

PZL-Mielec M-18 Dromader (PZL-Kalisz K-9) [Evol] into M-18/T45 Turbine Dromader (PT6A-45).

PZL(WSK)-Mielec M-24B Dromader Super (PZL-Kalisz K-9AA) [Evol] into M-24T (PT6A-45AG)

Snow S-2C (P&W R-985) [Conv] to 575 shp Garrett TPE-331
- 1973 Marsh conversion

Weatherly 620 (R-986R) [Evol] into 620-BTG (TPE 331) and 620-TP (PT6A-11AG)

Zlin Z-37 Cmelak (Avia M 462RF) [Conv] into XZ-37T (prototype M-601B conversion), [Evol] into enlarged production Z-37T Agro Turbo (M-601Z).

-----------------------
 

Apophenia

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PISTON-TO-TURBOPROP -- CONVAIR 240 SERIES

CONVERSIONS

Convair Allison Turboliner -- Prototype CV-240 converted to Allison 501

Allison-Convair 340/440 -- Allison 501 conv. offered by Allison Division of GM
-- http://www.flightglobal.com/pdfarchive/view/1959/1959%20-%203071.html

Convair 540 -- Convair 440 re-engined with Elands by Canadair, original 440 Eland conversions by PacAero - JAWA 1960-61/p370

Convair 580 -- Convair 340 re-engined with Allison 501 D13D/Hs

Convair 600 -- Convair 240 re-engined with Darts

Convair 640 -- Convair 340 or 440 re-engined with Darts

TESTBED

Convair YC-131C (Model 340-36) Allison YT56-A-3 testbed.

UNBUILT
[Evolution]

Convair VT-29E - Allison T38 turboprops, 3 ordered but not built.

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Apophenia

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PISTON-TO-TURBOPROP -- DOUGLAS DC-3/C-47 (TURBO-DAK) CONVERSIONS

TESTBEDS

RAF turboprop conversions
1949 - Armstrong Siddeley ASMa6 Mamba (Dakota IV KJ839)
1950 - Rolls-Royce Dart (Dakota IV)

[Anybody have Air Classics, Sept 2001, "First Turbine Gooney" by Jim Thompson?]

19?? - C-117 (R4D-8) used for US test installation of RR Dart

CONVERSIONS

UNBUILT

Canadian Car & Foundry marketed a DC-3 AS Mamba conversion

BUILT

1951 - BEA Turbo Dakota (2 x Darts, two freighter Daks)
1968 - Conroy Turbo Three (2 x Darts)
1977 - Conroy Tri Turbo-3 (3 x PT6)
1989 - Basler BT-67 (2 x PT6)
19?? - Professional Aviation Jet Prop DC-3 JAWA 1993-94/p343
1991 - SAAF C47TP "Turbodak" (2 x PT6)*
19?? - Greenwich Aircraft (Waco, TX) DC-3 (PT6A-67R).

* Conversions done by SAAF engineering under 'Project Felstone'.
[Anyone know why the hyphen in "C47" is usually missing for the SAAF Daks?]
http://www.saafmuseum.co.za/dakota.htm
http://newsite.ipmssa.za.org/content/view/124/28/

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PISTON-TO-TURBOPROP -- DE HAVILLAND/DE HAVILLAND CANADA CONVERSIONS

DeHavilland Conversions


DH.104 Dove (2 x DH Gipsy Queens) [Conv] into Carstedt Jet Liner 600 (2 x TPE 331)

DH.114 Heron (4 x DH Gipsy Queens) [Conv] with Saunders ST-27 (2 x PT6A-34)

DH.114 Heron/Saunders ST-27 [Evol] into Saunders ST-28 (one prototype C-FYBM-X c/n 005).


DeHavilland Canada Conversions

DHC-1 Chipmunk (DH Gipsy) [Conv] ex-RAF G-ATTS to APU-based turboprop (Rover TP.90/1)

DHC-2 Beaver [Evol] into turboprop with P&WC PT-6A

DeHavilland Canada [Evol] Prod'n DHC-2T Mk.III Turbo Beaver

- DHC-2 Beaver (P&W R-985) [Conv] Beaver I into turboprop

Pratt & Whitney Canada PT6A DHC-2 Beaver conversions

- DeHavilland Canada [Conv] 1963 DHC-2T Turbo Beaver, PT6A-6
-- Conversions lead to new-prod'n DHC-2T Mk.III Turbo Beaver
- Viking DHC-2T Turbo Beaver: reman'd Beaver I, 680 hp PT6A-34
- Wipaire Boss Beaver conv.: 650 hp PT6-20, -27, -28 or -34
- NB: In contrast with Turbo Beaver, Boss has std length fuselage
-- http://cdn-www.airliners.net/aviation-photos/photos/9/3/7/1567739.jpg
- Serv-Aero DHC-2 PT6A conversion kit in development (completed?)
-- Serv-Aero Engineering Inc, Salinas, CA

Garrett/Honeywell TPE331 DHC-2 Beaver conversions

- SWP (Australia, TPE331/cowling from Short Skyvan)
-- http://www.dhc-2.com/id440.htm
- Volpar Model 4000 - 1972 Garrett TPE331-2U-203
-- http://www.airteamimages.com/de-havilland-canada-beaver_N754_-private_49548.html

DHC-3 Otter (P&W R-1340-S1H1-G Wasp) [Conv] to turboprop

Pratt & Whitney Canada PT6A DHC-3 Otter conversions

- RCAF 3682 STOL testbed (2 x leased PT6A-4s on wings)*
-- * Plus a vectoring GE J85-GE-7 mounted in rear fuselage
- Cox DHC-3-T Turbo Otter, 1978 conv. to 662 hp PT6A-27
-- Cox Air Resources, Edmonton, AB, C-FMES-X prototype
- Cox Turbo Otter, 1981 re-eng. to PT-6A-135, N4247A
- Vancouver Island Air DH3 Turbine Otter conv. to 850 shp PT6A-140AG
- Vazar conv. to 750 hp PWC PT6A PT6A-135A or PT6A-34
-- aka DHC-3T Turbine Otter, Turbo Otter, or Vazar Dash 3
- Viking Air DHC-3T Turbo Otter conv.

Garrett TPE331 DHC-3 Otter conversions

- Western Rotorcraft Inc, 1972 Seattle conv to TPE331
- Texas Turbine Super Otter, 900 hp Garrett TPE331-10

- Walter M601 DHC-3 Otter conversions

- Stolairus Walter Turbine Otter, 750 shp M601E-11
-- Stolairus Aviation Inc, Kelowna, BC, eg: s/n 465 and 466
-- http://www.stolairus.com/files/2206843/uploaded/C-GSUV at Kal Air (RH Side View).jpg
- Vazar conv to M601E-11 (prob. confus. over Vazar PT6A conv. to Stolairus M601)
- AOG conv to Walter Turbine Otter (Walter M601E-11), eg: s/n 296 (C-FXZD)*
-- * AOG conv. at their Kelowna, BC facility, April 2004 (using Stolairus kit?)

Other DHC-3 Otter turbine conversions

- DHC-3 N5010Y test aircraft for Soloy Dual Pac (2 x PT6D-114A)
-- http://soloy.com/wp-content/uploads/2014/09/C08T.jpg

- All West Freight, 1,200 shp Lycoming T53*, N26DE not certified
-- N26DE stored in Alaska, T53 taken from a Grumman Mohawk
-- http://www.dhc3otter.com/26.htm

DHC-4 Caribou (2 x R-2000) [Conv] into DHC-4T Caribou II (2 x T64s)
DHC-4 Caribou (2 x R-2000) [Conv] into Pen Turbo DHC-4T (2 x PT6A-67Ts)
 
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Jemiba

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And another testbed, I think not still yet mentioned here :
A Martin B-26 Marauder with a Garrett turbo-prop:
(from Aviation Week1964)
 

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Apophenia

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TSRJoe: Thanks! Mamba-Vihuri has been added to the list.

Jens: I think that is Invader N26GT rather than a Marauder (nice to see the photo though). There were a few turbojet Marauder testbeds but I haven't heard of any turboprops.
 

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Oops, Apophenia you're absolutely right, its an Invader, as the upward opening
cockpit shows, sorry :-[
But what a stupid idea, to use the same designation for two different aircraft in
such a short timeframe ! ;)
 

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Jemiba said:
Oops, Apophenia you're absolutely right, its an Invader, as the upward opening
cockpit shows, sorry :-[
But what a stupid idea, to use the same designation for two different aircraft in
such a short timeframe ! ;)

Blame it on the "no room for Attack" mentality the Air Force had at the time, but that really is for a different thread.
 

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A few additions (mostly engine type details) -- all related to PT6A conversions.

Added conversions: Aero Commander 680T (PAC PT6-20 conversion), Northern Consolidated's 'half a Turbo Mallard' proof-of-concept conversion (one piston/one turboprop), Piper PA-31T Navajo (Cheyenne prototype), and the Swearingen SA26-T.

BTW, the original Harbin Y-11T used PT6A-11s swapped by P&WC for 7 surplus JT15D-4. The jet engines were intended for a Chinese business aircraft. Does anyone know anything about that unbuilt biz-jet design?
 

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Is the Aero Commander 680T also a prototype? Note that production turbine Aero Commanders were all equipped with Garretts.
 

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'Ray,

The PT6A-20-powered 680T was a conversion by PAC Holdings of Everett, WA. Design work was by Swearingen Aircraft -- Drawing List No. 3001-DL (10/31/66, revised 11/3/66). Unfortunately, the only photo I've seen shows a fresh, bare metal conversion (other than the new cowlings) with no registration markings applied.

The FAA Supplemental Type Certificate is SA710SW (filed 02/16/1966) issued to Rockwell (now Twin Commander Aircraft Corporation) but PAC is holder of the STC. STC SA710SW was amended in May 2004 but, AFAIK, no other PT6 conversions were done.
 

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Tailspin Turtle noted that the Allison/Soloy "Turbine Mentor 420" and unbuilt Bell XV-3 T-53 conversions were missing. Both have been added (as a convertiplane, the XV-3 seemed to qualify).

TT also mentioned the Goodyear GZ-22 blimp ("Spirit of Akron" with Allison 250-B17s) evolved from the smaller, IO-360-powered GZ-20A series.
 

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Hi,

here is the Fairchild Turboxcar,it was powered by four T55 Lycoming
turboprop engines (project).
http://www.flightglobal.com/pdfarchive/view/1957/1957%20-%200710.html?search=aircraft
 

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A long time ago I saw a C-337 convert that was a single turboprop in the rear, and had had around 30 inches, up front, added to it.
Can anyone tell me the name?
 

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On page 7 of this thread, Apophenia mentioned the Robertson
O-2ST as a pusher turbopor conversion of the O-2A. Couldn't
find nay photo of it, only of the Conroy Stolifter, were the FORWARD
engine was replaced by AiR TPE331, to give a spaciaous rear fuselage.
(from AviationWeek 12/1968)
 

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Did a Google search and finally found a book with a photo of a O-2ST "Cessna 337". I put the link in here. Now I'm going to try and find a copy of the book. Thank you, for your help, I needed the name for the search.

http://books.google.com/books?id=Wb2I5GEF--QC&pg=PA247&lpg=PA247&dq=Robertson+O-2ST&source=bl&ots=Ep2C_IfNqK&sig=QBKpB4wHjykSRBrm-bNAAcRJQhg&hl=en&ei=gzGxScuAAp6Dtwe5wom8Bw&sa=X&oi=book_result&resnum=1&ct=result
 

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Sorry guys, I had an image of the O-2ST. I thought this thread was dead and dumped it :(

Robertson did the design work but the mods were performed by Sierra Industries. The actual concept came directly from Cessna but they didn't want to be directly involved. The O-2ST seems to have had CIA or other such connections. The Sandcrab name sprang from the intended customer -- Saudi Arabia.

If you squint, you can make out the general O-2ST layout here

http://books.google.ca/books?id=Wb2I5GEF--QC&pg=PA182&lpg=PA182&dq=sierra+%22O-2ST%22+sandcrab&source=bl&ots=Ep2C1GdPpK&sig=yshQm3sWTIBU9U2q8aKbB5eI1_g&hl=en&ei=MXC1SdiQF5KWsQP3zeSUAQ&sa=X&oi=book_result&resnum=1&ct=result
 

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As Thomas just again pointed to this thread, I've recently got a Morane-Saulnier
projetcs list, with a type that actually thrilled me, a MS.502 conversion to turboprop,
or, just to use a readily understandable name, a "Turbo-Storch" ! ;)

(Attention, this is just a provisional drawing only !)
 

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Very cool. Thanks Jens.

Was this turbo Criquet conversion actually built? I'm guessing the turbine is an Artouste??
 

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"I'm guessing the turbine is an Artouste??"

An Astazo was intended and, no, it wasn't built. But the designation given in this
list is "MS.506", so I think, the examples flying around with continental engines and
designated MS.506, too, got their designations just by the owners or the company,
who did these modifications, not by S, or SOCATA, as its successor.

P.S.: Will do a better drawing later, based on engine size and shape ...
 

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Thanks Jens. Added as unbuilt MS.506 conversion from MS.502.
 

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I discovered a crime!
A Cessna 195 with a turboprop with Brazilian registration PT-ZPN.
Does anyone know the correct engine type?
 

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The standard engine would be a 520 to 550 cubic inch Lycoming or Continental, I don't know off the top of my head, it's easy to look up. As for the turboprop conversion itself, well, it's his plane, a lot of people go for the Soloy turboprop conversion on the similarly-sized 206 so people obviously feel it to be useful.

EDIT: Thought it was a 185 at first, anyway the original engine was a radial Jacobs, not quite sure on exact displacement off the top of my head. Once again it's not hard to look up.
 

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Most probable enigine is a TPE331, though it could be an Allsion 250 which would be a lighter engine. After all, someone replaced the Lycoming IO360 in a Great Lakes sport biplane with an Allison 250 and got, IIRC, twice the horespower at no significant change in weight. From everything I read, it put on stunnign displays.
 

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