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Jens was first-up with a turboshaft conversion, the Sikorsky S-58T. Here's a tentative list of unbuilt and built piston-to-turboshaft conversions ...
_________________________________________________________
PISTON-TO-TURBOSHAFT CONVERSIONS
UNBUILT
Bölkow Bo 103 (4-cyl Agusta GA.70 V) [Evol] to Bo 103B (90 shp BMW turboshaft)*
[* presumably this engine was the 66kW/90hp BMW/MAN/MTU 6012]
http://www.gasturbine.pwp.blueyonder.co.uk/bmw.htm
http://www.technologie-entwicklung.de/Gasturbines/MTU_6012/mtu_6012.html
http://www.eads.net/1024/en/eads/history/airhist/1950_1959/bo102_1957.html
http://www.eads.com/1024/en/eads/history/airhist/1960_1969/bo103_1961.html
Bölkow Bo 104 (2 x NSU Wankel rotaries) [Evol] to (2 x MAN 6022-A3s)*
[* Originally by BMW, the MAN 6022-A3 was derived from the CH-53G's APU]
Bölkow P 309 (piston type?) [Evol] to (turboshaft type?) Gersdorff: Ludwig Bölkow und sein Werk p91
Bristol 171 (Leonides 173) [Evol] into Bristol 203 (1 x RR Gnome) and 214 (2 x Gnome)
http://www.secretprojects.co.uk/forum/index.php/topic,2298.15.html
Bristol 173/191 (2 x Leonides Major) [Evol] into 192 (2 x Napier Gazelle)
http://www.secretprojects.co.uk/forum/index.php?topic=2872.msg23033
Hiller UH-12E5 (Lycoming VO-540) [Evol] into UH-12E5T (Allison 250-C20B)
[Similar to Soloy conversion, proposed for US Army New Training Helicopter program]
Kamov Ka-26 (2 x M-14V-26 radials) [Evol] into Ka-128 (Turboméca Arriel 1D1)
Piasecki H-21 (1 x R-1820-103) [Conv] to turboshaft (3 x Turboméca Turmo III, 750 shp max, 600 shp continuous) AFM N°10, 6/7 2006
Piasecki YH-16 Transporter (2 x P&W R-2180 Twin Hornets) [Conv] to YH-16B Turbotransporter (2 x 3700 shp Allison T56) http://www.aero-web.org/specs/piasecki/yh-16a.htm
Vertical Aviation Technology 260L/Sikorsky S-52 (Lycoming VO-435) [Conv] to Hummingbird 260T (mockup installation only, Allison 250-C18) FRW 7/1988 p32 & JAWA 1988-89 p495
Yakovlev Yak-24 (2 x ASh-82Vs) [Evol] into Yak-24P (2 x 2700 shp AI-24V)
http://www.aviastar.org/helicopters_eng/jak-24.php
--------------------
BUILT
Bell 47G (Lycoming VO-435) [Conv] by Soloy (Allison 250-C18) [German aviation magazine] Aircraft (Ger. magazine) # 27 753
Bristol 191 (Belvedere predecessor, 2 x Leonides Major) [Conv] into Bristol 191/2 (192 test rig, 2 x Napier Gazelles)
http://www.secretprojects.co.uk/forum/index.php?topic=2872.msg23033
Enstrom F-28, 1 x 225 hp Lycoming HIO-360 [Evol] to Spitfire Mk 1, 1 x 420 hp Allison
-- F-28 deriv. by Spitfire Helicopter Company of Lynnfield, Massachusetts
Enstrom 280FX, 1 x 225 hp HIO-360 [Conv] to 280FXT, 1 x 420 hp Allison 250-C20W
-- led to similar 3-seat TH-28 for US Army, 6 built before program cancelled
-- led to 4-seat civil/military Enstrom 480 series, 285 shp Allison 250-C20W
Harbin Z-5/Xuanfeng (HS-7/ASh-82V) [Conv] to Z-6 (PT6T-6 Twin Pac)
Hiller UH-12D and 'E (Lycoming VO-540) [Conv] by Soloy into UH-12E3T (Allison 250-C20B)
http://www.geocities.com/capecanaveral/launchpad/5249/12e3t.htm
Hiller 360 (Franklin/Lycoming) [Evol] into 12L-4 test-bed (PT6A)
Kaman K-225 (1 x 225 hp Lycoming O-435-A2) [Conv] to 1 x 175 shp Boeing 502-2
-- First turboshaft-powered helicopter, December 1951
Kaman K-240 (HTK-1), 1 x 240 hp O-435-A2) [Conv] to to HTK-2, 2 x 225 shp Boeing YT50-BO-2
-- NB: some sources list a rating of only 210 shp for the Boeing 502-2/YT50-BO-2s
Kaman K-600 (HOK-1) 600 hp P&W R-1340-28 [Conv] to Lycoming XT53, led to H-43B
Kaman K-600 (H-43B) [Evol] 1 x 849 shp Lycoming T53-L-1B turboshaft
Kamov Ka-26 (2 x M-14V-26 radials) [Evol] into Ka-126 (1 x Mars TV-O-100) and [UNBUILT] Ka-128 (Turbomeca Arriel 1D1)
Kamov Ka-26 [Evol] into Ka-226 (2 x Allison 250-C20s, optional Progress AI-450, Turboméca Arrius 2G, or Klimov VK-800)
Piasecki YH-16 Transporter (2 x P&W R-2180 Twin Hornets) [Evol] to YH-16A (2 x 1800 shp Allison T38) http://www.aero-web.org/specs/piasecki/yh-16a.htm
Sikorsky S-52 (Franklin O-425-1) [Conv] into Sikorsky S-52-5 (Turboméca Artouste II) JAWA 1954-55 p295
Sikorsky S-52/H-18 (Franklin O-425-1) [Conv] into Sikorsky XH-39/S-59 (Continental XT51-T-3 Artouste II) http://www.aerofiles.com/sik-s59.jpg http://www.aerofiles.com/sik-h39.jpg
Sikorsky S-55 (R-1340, R-1300) [Conv] into Helitec/Aviation Specialties S-55T (TSE 331)
Sikorsky S-55 (R-1300) [Conv] into Vertical Aviation Technology Whisper Jet S-55QT (TSE 331)
Sikorsky S-58 (R-1820-84) [Conv] by Sikorsky or Orlando into S-58T (PT6T-3 or PT6T-6)
Sikorsky S-58 (Westland import, R-1820-84) [Conv] to Wessex testbed (1 x Napier Gazelle NGa.11)
Westland WS-55 Whirlwind (R-1340-40, R-1300-3, Leonides Major) [Conv/Evol] into Whirlwind Mk3 (T58/RR Gnome)
---------------------------
_________________________________________________________
PISTON-TO-TURBOSHAFT CONVERSIONS
UNBUILT
Bölkow Bo 103 (4-cyl Agusta GA.70 V) [Evol] to Bo 103B (90 shp BMW turboshaft)*
[* presumably this engine was the 66kW/90hp BMW/MAN/MTU 6012]
http://www.gasturbine.pwp.blueyonder.co.uk/bmw.htm
http://www.technologie-entwicklung.de/Gasturbines/MTU_6012/mtu_6012.html
http://www.eads.net/1024/en/eads/history/airhist/1950_1959/bo102_1957.html
http://www.eads.com/1024/en/eads/history/airhist/1960_1969/bo103_1961.html
Bölkow Bo 104 (2 x NSU Wankel rotaries) [Evol] to (2 x MAN 6022-A3s)*
[* Originally by BMW, the MAN 6022-A3 was derived from the CH-53G's APU]
Bölkow P 309 (piston type?) [Evol] to (turboshaft type?) Gersdorff: Ludwig Bölkow und sein Werk p91
Bristol 171 (Leonides 173) [Evol] into Bristol 203 (1 x RR Gnome) and 214 (2 x Gnome)
http://www.secretprojects.co.uk/forum/index.php/topic,2298.15.html
Bristol 173/191 (2 x Leonides Major) [Evol] into 192 (2 x Napier Gazelle)
http://www.secretprojects.co.uk/forum/index.php?topic=2872.msg23033
Hiller UH-12E5 (Lycoming VO-540) [Evol] into UH-12E5T (Allison 250-C20B)
[Similar to Soloy conversion, proposed for US Army New Training Helicopter program]
Kamov Ka-26 (2 x M-14V-26 radials) [Evol] into Ka-128 (Turboméca Arriel 1D1)
Piasecki H-21 (1 x R-1820-103) [Conv] to turboshaft (3 x Turboméca Turmo III, 750 shp max, 600 shp continuous) AFM N°10, 6/7 2006
Piasecki YH-16 Transporter (2 x P&W R-2180 Twin Hornets) [Conv] to YH-16B Turbotransporter (2 x 3700 shp Allison T56) http://www.aero-web.org/specs/piasecki/yh-16a.htm
Vertical Aviation Technology 260L/Sikorsky S-52 (Lycoming VO-435) [Conv] to Hummingbird 260T (mockup installation only, Allison 250-C18) FRW 7/1988 p32 & JAWA 1988-89 p495
Yakovlev Yak-24 (2 x ASh-82Vs) [Evol] into Yak-24P (2 x 2700 shp AI-24V)
http://www.aviastar.org/helicopters_eng/jak-24.php
--------------------
BUILT
Bell 47G (Lycoming VO-435) [Conv] by Soloy (Allison 250-C18) [German aviation magazine] Aircraft (Ger. magazine) # 27 753
Bristol 191 (Belvedere predecessor, 2 x Leonides Major) [Conv] into Bristol 191/2 (192 test rig, 2 x Napier Gazelles)
http://www.secretprojects.co.uk/forum/index.php?topic=2872.msg23033
Enstrom F-28, 1 x 225 hp Lycoming HIO-360 [Evol] to Spitfire Mk 1, 1 x 420 hp Allison
-- F-28 deriv. by Spitfire Helicopter Company of Lynnfield, Massachusetts
Enstrom 280FX, 1 x 225 hp HIO-360 [Conv] to 280FXT, 1 x 420 hp Allison 250-C20W
-- led to similar 3-seat TH-28 for US Army, 6 built before program cancelled
-- led to 4-seat civil/military Enstrom 480 series, 285 shp Allison 250-C20W
Harbin Z-5/Xuanfeng (HS-7/ASh-82V) [Conv] to Z-6 (PT6T-6 Twin Pac)
Hiller UH-12D and 'E (Lycoming VO-540) [Conv] by Soloy into UH-12E3T (Allison 250-C20B)
http://www.geocities.com/capecanaveral/launchpad/5249/12e3t.htm
Hiller 360 (Franklin/Lycoming) [Evol] into 12L-4 test-bed (PT6A)
Kaman K-225 (1 x 225 hp Lycoming O-435-A2) [Conv] to 1 x 175 shp Boeing 502-2
-- First turboshaft-powered helicopter, December 1951
Kaman K-240 (HTK-1), 1 x 240 hp O-435-A2) [Conv] to to HTK-2, 2 x 225 shp Boeing YT50-BO-2
-- NB: some sources list a rating of only 210 shp for the Boeing 502-2/YT50-BO-2s
Kaman K-600 (HOK-1) 600 hp P&W R-1340-28 [Conv] to Lycoming XT53, led to H-43B
Kaman K-600 (H-43B) [Evol] 1 x 849 shp Lycoming T53-L-1B turboshaft
Kamov Ka-26 (2 x M-14V-26 radials) [Evol] into Ka-126 (1 x Mars TV-O-100) and [UNBUILT] Ka-128 (Turbomeca Arriel 1D1)
Kamov Ka-26 [Evol] into Ka-226 (2 x Allison 250-C20s, optional Progress AI-450, Turboméca Arrius 2G, or Klimov VK-800)
Piasecki YH-16 Transporter (2 x P&W R-2180 Twin Hornets) [Evol] to YH-16A (2 x 1800 shp Allison T38) http://www.aero-web.org/specs/piasecki/yh-16a.htm
Sikorsky S-52 (Franklin O-425-1) [Conv] into Sikorsky S-52-5 (Turboméca Artouste II) JAWA 1954-55 p295
Sikorsky S-52/H-18 (Franklin O-425-1) [Conv] into Sikorsky XH-39/S-59 (Continental XT51-T-3 Artouste II) http://www.aerofiles.com/sik-s59.jpg http://www.aerofiles.com/sik-h39.jpg
Sikorsky S-55 (R-1340, R-1300) [Conv] into Helitec/Aviation Specialties S-55T (TSE 331)
Sikorsky S-55 (R-1300) [Conv] into Vertical Aviation Technology Whisper Jet S-55QT (TSE 331)
Sikorsky S-58 (R-1820-84) [Conv] by Sikorsky or Orlando into S-58T (PT6T-3 or PT6T-6)
Sikorsky S-58 (Westland import, R-1820-84) [Conv] to Wessex testbed (1 x Napier Gazelle NGa.11)
Westland WS-55 Whirlwind (R-1340-40, R-1300-3, Leonides Major) [Conv/Evol] into Whirlwind Mk3 (T58/RR Gnome)
---------------------------