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Letov Designations

hesham

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from Czechoslovakia,

Letov L-101 :was a twin Argus As.410-powered 12-passenger
feeder liner commerical monoplane.
Letov L-290 Orel :was a four engined (BMW 801) 44-48 passenger
airliner, produced after the WW2 as a civil development
of Junkers Ju-290 bomber.
 

Apophenia

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Letov Kbely (Letov Military Aircraft Works)

A list of 1920 to 1945 Letov designations. As usual, a few projects but mostly holes to fill ;D

Note: early designations combined chief designer, Alois Smolík's initial with engine type and design number. Eg: SHS-4 = S for chief designer, Alois Smolík; HS for Hispano-Suiza 8Ba; and 4 for the fourth Letov design. Designations were later rationalized, dropping the engine type letters. Design evolutions followed the French pattern (eg: S-18 begets S-118, S218, etc.).
________________________________________________________________________

Letov S-1 - two-seat reconnaissance biplane, 1920, 1 x 230 hp 6-cyl Hiero L, 28 built
- SH-1, original designation (H = Hiero), redesignated S-1
- Sm A 1, commercial variant, canopy over rear cockpit for 2 passengers
- S-10 - 1921, 100 hp B & D "Blesk" (Czech-built Mercedes DI)

Letov S-2 - two-seat reconnaissance biplane, 1 x 260 hp 6-cyl Maybach Mb.IVa, 64 built.
- SM-1, original designation (M = Maybach)
- SM-2, original designation (M = Maybach)

Letov S-3 - single-seat parasol monoplane fighter, 1921, 182 hp 6-cyl BMW IIIa, prototype
- SB-3,, original designation (B = BMW)

Letov S-4 - biplane fighter/trainer, 1922 1 x 220 hp V-8 Hispano-Suiza 8Ba
- SHS-4, original designation (HS = Hispano-Suiza)
- S-4a, production aircraft used as fighter trainers, 20 built

Letov S-5 - S-1 biplane modified for evaporate cooling trials.

Letov S-6 - two-seat biplane bomber, 1923, 1 x 255 kW 6-cyl Maybach IVa, 35 built (led to S-16 and civil S-19)

Letov S-7 - mixed-construction biplane fighter, 1923, 220 hp V-8 Skoda HS 8Fb, prototype

Letov S-8 - single-seat, shoulder-wing monoplane experimetal aircraft, 1922, annular radiator, 1 x 450 hp W-12 Napier Lion II.
- Sm-8 [Project or alt. designation? Commercial variant?]

Letov S-9 - [Project] three-engined bomber concept, 1923 (see S-15, layout 2)

Letov S-10 - S-1 trainer variant with 100 hp 6-cyl Breitfeld & Danek Blesk (Czech Mercedes DI)

Letov S-11 - twin-engined commercial monoplane [not completed?]

Letov S-12 - single-seat parasol monoplane fighter, 1924, 1 x 220 hp V-8 Hispano-Suiza 8ba, prototype

Letov S-13 - single-seat biplane fighter, 1924, 1 x 295 hp V-8 Skoda 8Fb, prototype (initially unbraced wings, later braced)

Letov S-14 - single-seat biplane fighter, 1924, 1 x 295 hp V-8 Skoda 8Fb, prototype (parallel with the S-13 but abandoned in favour of S-20, later converted to monoplane)

Letov S-15 - [Project] large high-winged monoplane airliner, three versions, 1924,
- S-15 layout 1: 4 x HS engines in tandem pairs, otherwise conventional layout
[Note: this 'layout 1' may be the only project accurately designated S-15.]
- S-15 layout 2: trimotor, 1 x Napier Lion tractor in nose, 2 x 220 hp BMW pushers
[May be the same as S-9. Or, less likely, S-15 'layout 2' may be 30-pax airliner version of S-9.]
- S-15 layout 3: 7 x tractor propellers, pod and boom (with vertically-arranged twin booms), 4 engines in wings, 3 engines arranged vertically on deep section nose.
[Probably accurately designated S-137. S-37 project may have been related to the S-15.]

Flight 19 June 1924 http://www.flightglobal.com/pdfarchive/view/1924/1924%20-%200399.html

Letov S-16 - all-metal reconnaissance biplane, 1926, 1 x 450 hp W-12 Lorraine Dietrich 12E
- S-16B (or SB-16), bomber variant, lowered rear fuselage decking, 1928
- S-16L (22 for Latvia as the 'C1', HS 8Fb)
- S-16J (floatplane version for Yugoslavia)
- S-16T (16 for Turkey, to be followed by unrealized licenced S-616)
- S-116 bomber, 1928, 1 x 500 hp 6-cyl Skoda L, Handley-Page slots on wings
- S-216 bomber, 1928, 1 x 480 hp 9-cyl Walter Jupiter (or Gnome-Rhone Jupiter VIII), 3 built
- S-316 bomber, 1931, SB-16 conversions with 1 x V-12 Hispano Suiza 12Lb, 3 built
- S-416 bomber, 1929, a S-16 conversion with 1 x 515 hp [?]-cyl Breitfeld & Danek DL
- S-516 bomber, 1930, 1 x 800 hp W-12 Praga Asso 9-W, 2 built (failed competitior to Aero A-100, later record attempt aircraft with spats fitted)
- S-616 bomber, 1 x 650 hp V-12 Hispano-Suiza 12Nbr (4-bladed propeller), 12 built
- S-716 bomber
- S-816 bomber, 1932, [?] hp V-12 Praga ESV engine
- S-916 attack aircraft

Letov S-17 - third prototype S-16 with V-12 Breitfeld-Danek (Praga) BD-500 engine, 1929.

Letov S-18 - two-seat biplane trainer, 1925
- S-18, 1925, 1 x 60 hp 5-cyl Walter NZ 60 radial
- S-118, 1925, 1 x 85 hp 7-cyl Walter NZ-85 radial
- S-218, 1926, metal wing struts, 1 x 120 hp 9-cyl Walter NZ-120 radial (Finnish-built 150 hp 7-cyl Bramo Sh.14A)

Letov S-19 - 1+4 passenger transport biplane, 1925 (civilian version of Letov S-6), 1 x 255 hp Maybach IVa (later 250 hp 6-cyl Walter W-IV, licenced BMW IV)

Letov S-20 - single-seat biplane fighter, 1926, 1 x 300 hp kW V-8 Skoda HS 8 Fb
- S-20L fighter (for Lithuania with interchangable ski u/c), 1925, 10 built
- S-20J fighter, 1927, 480 hp Walter Jupiter, led to S-31 fighter
- S-20R, 1927, revised, smaller fuselage (also called S-20M)

Letov S-21 - single-seat biplane fighter, 1925, 180 hp V-8 Skoda HS 8Aa (similar to S-20 but with annular radiator)

Letov S-22 - parasol monoplane fighter, 1926, 450 hp W-12 Skoda L (HS 50)

Letov S-23 - [?]

Letov S-24 - light night bomber biplane, 1927 (S-16 development)

Letov S-25 - two-seat reconnaissance biplane, 1930, 295 hp kW V-8 Skoda HS 8Fb, 3 built

Letov S-26 - [Project] Modernized S-16 deriv.

Letov S-27 - [Project] (1928) high-wing monoplane, 18 passenger airliner, 3 x 450 hp Walter Jupiter

Letov S-28 - two-seat reconnaissance biplane, 1928, 235 hp 9-cyl Walter Castor radial
- S-128, 1931, 450 hp 9-cyl Walter Jupiter VI radial
- S-128SM with 500 hp 9-cyl Gnome-Rhône Mercure VII radial (became S-228)
- S-128 [Project] armoured attack aircraft, pilot beneath upper wing, dorsal and ventral gun positions Breitfeld & Danek BD 500 engine
- S-228, 1931, as per S-128SM (demonstrated to Finns with 500 hp 9-cyl P&W Hornet radial)
- S-228E, 1932, four export aircraft for Estonia
- S-328, reconnaissance aircraft, 1932, 730 hp Walter Pegasus III-M2
- S-328F, engine change prototype, 740 hp V-12 Avia Vr-36
- S-328FM, armaments change (Skoda vz. 30)
- S-328V, twin-float seaplane (Short Bros. floats)
- S-328W (S-328-2), as per S-328F, 630 hp V-12 Avia Vr-36
- S-328N (Nachtjäger) Luftwaffe conversions for Störkampfstaffeln
- S-428, 1933, S-238W ground attack variant, 650 hp V-12 Avia Vr-36
- S-528, 1934, 800 hp 14-cyl Walter K14 (Gnome-Rhône Mistral Major 14 Krsd)

Letov S-29 - [Project] high-wing monoplane bomber, 1929, 4 x 450 hp Walter Jupiter (one engine positioned beneath each wing, another engine above each wing), nose, dorsal, and ventral gun positions

Letov S-30 - [Project] biplane airliner (pilot seated in open cockpit behind enclosed cabin), 4 x [?] in tandem push-pull arrangements

Letov S-31 - all-metal single-engine, single-seat, biplane fighter, 1929.
- S-31 fighter/trainer, based on S-20J with 450 hp 9-cyl Walter Jupiter radial, 33 built.
- S-31A, Bristol Mercury (becomes S-231)
- S-131, 500 hp 9-cyl BMW Hornet, 3 built.
- S-231, 1933, new wing profile, Townend ring on 550 hp Bristol Mercury, 24 built.
- S-331, prototype fighter, 1935 (sold to Spain), 880 hp 9-cyl Walter K-14 radial
- S-431, prototype fighter, 1936 (crashed on trials), 14-cyl AS Tiger III

Letov S-32 - shoulder-wing monoplane airliner, 1931, 3 x 140 hp 14-cyl Walter Mars, 4 built (CSA)
Flight 8 Jan 1932, article (photos & 3-view)
http://www.flightglobal.com/pdfarchive/view/1932/1932%20-%200036.html

Letov S-33 - 2- to 3-seat high-wing bomber/record, 1 x 790 hp W-12 Praga Asso 9-W, brief test hop before ground (for excessive vibration), replaced by S-516.

Letov S-34 - [Project] 3-engined heavy bomber. S-30 deriv.

Letov S-35 - [?]

Letov S-36 - [?]

Letov S-37 - [possibly correct designation of 7-engined, twin-boom airliner, see: S-15 layout 3.]
- S-37 - [unknown origin of S-137 airliner project]
- S-137 - [Project] transatlantic airliner, 1920

Letov S-38 - (1930) two-seat reconnaissance biplane, twin-finned, with gun turret, twin-finned (transferable S-328)

Letov S-39 - two-seat, parasol monoplane sports plane (with HP slats), 1931,
- S-39 series aircraft, 1934, 1 x 55 hp 3-cyl Walter Polaris radial
- S-139, prototype (OK-ELA), 1933, 80 hp 7-cyl Pobjoy R radial
- S-239, 85 hp 4-cyl Walter Minor 4, 16 built (10 to flying clubs)

Letov S-40 - [Project] 2-engine, twin-boom 18-pax transport

Letov S-41 - [Project] twin-engined airliner, 1934
- S-41A: conventional layout, 1 crew + 12 passengers
- S-41B: [?]
- S-41C: twin-fuselage aircraft, 1 crew + 6 passenger in each fuselage

Letov S-42 - [Project] 2-engine, twin-boom medium bomber
- S-42: Developed from S-40 airliner project

Letov S-43 - [Project] three-seat, twin-engined, twin-tailed light bomber
- S-43: Competing with Aero A-300 and Avia B-153, nose and dorsal turrets

Letov S-44 - [Project] single-seat light fighter
- S-44A [?]
- S-44B, 1 x 528 hp V-12 Walter Sagitta IV-M, estimated 320 mph.

Letov S-45 - [Project] two-seat strike aircraft and light bomber, 2 x Walter Sagitta

Letov S-46 - attack aircraft [details ?]
- S-146 - attack aircraft [details ?]

Letov S-47 - [?]

Letov S-48 - [?]

Letov S-49 - [Project] two-seat, twin-engined light bomber, 2 x 528 hp V-12 Walter Sagitta IV-M, 1936

Letov S-50 - three-seat monoplane, 1938, 2 x 430 hp 7-cyl Avia Rk-17 radial, bomber prototype.
- S-50 : three-seat monoplane reconnaissance-bomber (optional 2 x Gnome-Rhône 14M)
- S-50A: [bomber prototype?]
- S-50B: [?]
- S-50C: [?]
- S-50D: [Project] light transport derivative of S-50 reconnaissance-bomber.

Letov S-51 - [Project] single-engined fighter (similar to S-44B), 2 x 20 mm, 1 x 14 cyl 1005 hp Gnôme Rhône-14N

Letov S-52 - [Project] twin-engined bomber trainer (evolution of S-50), retractable undercarriage, dorsal turret, flexible gun positions in lower and forwardmost nose positions.

Letov S-53 - [?]

Letov S-54 - [?]

Letov S-55 - [?]

Letov S-56 - [Project] all-metal, twin-boomed attack aircraft/light bomber, 2 x [?] radial engines, crew positions in both booms, high-mounted wing, single centrally-placed vertical fin/rudder.

Letov S-57 - [Project] two-seat liaison aircraft, low wing, trousered fixed undercarriage, 1 x 120 hp 4-cyl Walter Major 4

Letov S-132 - [Project] Bomber and Transport, S-15 devel.

Letov S-?? - ... Any others ??
 

Apophenia

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Further reading for those interested ...

L+K listings for Letov/Rudý Letov aircraft (condensed from Letecký Archív)
http://aviatika.wz.cz/cs.htm

S-2 - L+K 5/87 (restoration)
S-4 - L+K 13/91 (photos)
S-13 - L+K 3/85 (short article, drawings, pg 115)
S-16 - L+K 12-14/83 (Monograph - J. Krumbach), L+K 6/65 (Monograph - K. Bittner, J. Krumbach), L+K 20-21/87 (P. Samek)
S-18 - L+K 19/92 & 10/93 (Bulgaria - P. Týc), L+K 24/93 (Latvia)
S-218 - L+K 16/80 (photo, cockpit)
S-20 - L+K 18-22/93 (Lithuania - P. Týc), L+K 11/87 (S-20 in Lithuania)
S-328 - L+K 20-22/84 (Monograph - J. Krumbach, J. Vrany), L+K 19/72 (Monograph - K. Bittner, J. Krumbach), L+K 9/68 (K. Bittner, J . Krumbach), L+K 18/80 (Aircraft 1939-1945), L+K 8-11/85 (J. Krumbach), L+K 12/85 (S-328 Colours after 1939 - J. Vrany), L+C 17/88 (Smolík biography - J. Vraný)
S-31 - L+K 22/88 (short article, pg. 875)
S-32 - L+K 9-11/92 (Monografie - J. Kase, V. Piric)

C-2 (Arado Ar-96) - L+K 26/79 (Monograph - O. Soukup)
XLA-54 - L+K 1/79 (Monograph - P. Marjánek)
LF-107 Lunák L+K 4-5/81 (Monograph - J. Brskovský), L+K 1-2/87 (C. Zbuzek), L+K 10/88 (memory L. Stros)
XLF-207 Laminár - L+K 6/81 (Monograph - J. Brskovský)
L-52 project - L+K 6/93 (Z. Pátek, R. Theiner)
Simulator TL-X - L+K 4/89 (V. Bezányi)

Note: the full list includes the LF-109 Pionýr (L+K 16-18/83) by LET not Letov, AFAIK.
 

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S-45 -two-seat strike aircraft and light bomber, 2 x Walter Sagitta, project only
 

hesham

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Pre-1945 and post-1945

S-46 and S-146 were attack aircraft,L-101 transport,L-290 transport,
L-106 twin boom transport project,L-53 single engined light aircraft
project,L-115 twin jet engines project,L-11 sailpane and the S-916
attack aircraft.
http://www.secretprojects.co.uk/forum/index.php/topic,887.0/highlight,aircraft+from+different+countries.html
 

Apophenia

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Thanks Hesham. It wasn't going to do a Rudý Letov designations list -- too many missing. But, here's what I have so far ...

Post-WWII Rudý Letov ('Red Letov') Projects

Letov L-11 - glider
Letov L-13 Blanik - glider
- L-13J - motor glider [engine type?]
- XL-13M - motor glider (Walter A)
- XL-13T - motor glider (Trabant engine)

Letov L-52 - [Project] jet fighter design based on wings and tail of Avia S-92, new fuselage with 1 x RR Derwent or RR Nene.
- L-152 [Project] , no details (possibly designation for Nene-powered L-52).
Letov L-53 - [Project]

Letov LF-107 Lunák - 1948, single-seat sports glider [alt. designation VT-7 ?]
Letov XLF-207 Laminar - 1951, Lun(ák derivative with laminar flow wing

Letov L-101 - feeder liner, 2 x Argus As.410, 12-passenger
Letov L-106 - [Project] twin-boom transport
Letov L-115 - [Project] twin-jet [details ?]
Letov L-290 Orel - based on Junkers Ju 290, 4 x BMW 801, 44-48 passenger

Trenazér TL-X - simulator for L-39 and L-610
http://www.flightglobal.com/pdfarchive/view/1990/1990%20-%200674.html

Letov Aircraft with Czech Air Force Designations

Letov XLA-54 - trainer, 1950, 1 x M 411R
- [was the XLE-10 a related or competing design?]
Letov LB-79 - 2 x Heinkel He 219A-5 (lehký bombardér) built from recovered components, 1951, 1 ("34") used as jet engine testbed.
Letov C-2 - Arado Ar-96B trainer
- C-2A [back designation for wartime production Ar-96 for Luftwaffe/]
- C-2B - Arado Ar-96B produced for Czech Air Force
Letov C-3 (or C-103) - Siebel Si-204
 

borovik

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Letov S-9 (1923) proect three engined bomber (see - S-15 layout 2)

Letov S-24 (1927) light night bomber (development S-16)

Letov S-27 (1928) proect high-wing monoplane, three engined (Walter "Jupiter" 450 h.p.) passenger
airplaine /18 person/

Letov S-29 (1929) bomber, high-wing monoplane, 4x Walter "Jupiter" (location:
one under the wing of another over it), project only
Letov S-30 (1928) passenger airplaine /18 person/, biplane, 4x Walter "Jupiter" (pull & pusher) project
only.
Letov S-38 (1930) two-seat reconnaissance biplane, with gun turret, twin-finned (transferable S-328)

Letov S-41 (1934) layout 1:passenger airplaine /12 person/, twin-engined, project only
S-41 (1934) layout 2:passenger airplaine, twin-fuselage aircraft /1+6 person in every/ project
only .
source: V. Nemechek "Czechoslovak aircraft 1918-1945" Volume 1.,
(Some of them have views from the side. If interested can send posting)
 

Apophenia

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Excellent stuff -- many thanks Borovik!

borovik said:
source: V. Nemechek "Czechoslovak aircraft 1918-1945" Volume 1.,
(Some of them have views from the side. If interested can send posting)
Yes please ;D Perhaps an on-going Letov Projects thread in the Early Aircraft Projects section?
 

hesham

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Hi,

the LG-124,LG-125 and LG-130 were a gliders.
 

Apophenia

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Hello Hesham. AFAIK, the LG-124 Galánka and LG-125 Sohaj 2 were both LET products not Letov (as was the LG-425 Sohaj 3), and the LG-130 Kmotr (or Z-130) was a product of Moravan Otrokovice (aka Zlin).
 

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Some postwar projects:
Letov L-103 (1947/48) - 30-seat twin-engined airliner with pressurized cabin.
Letov L-105 (1946) - ultralight sport aircraft made of laminated wood. One-man crew, 25-hp Walter A engine, maximum speed 136 km/h.
Letov L-106 Soumar (1948) - twin-boom transport aircraft: 1200 kg payload, two 700-hp Walter V-12 engines (aka M-446).
Letov L-53 - observation, artillery spotting and multipurpose aircraft, a counterpart for Praga E-55 and Aero Ae-50.
Letov L-501 - piston fighter with M-211 (Jumo 211) engine; looks not unlike the Mustang.
Letov LA P-9 (1949) - jet trainer fighter: M-003 engine (BMW 003?), maximum speed 580 km/h (seems to be too small, but this is data from Nemeček's book).
Letov LA-58 (1951/52) - multiplace twin-engined training aircraft, seems to be a planned successor for Si 204 / Aero C-3. Two V-12 (M-446) engines.
Letov L-42 (1960) - kind of "business jet" (6-8 passengers) and trainer aircraft. Two rear-mounted M-701 turbojets (10,8 kN each). Cruise speed 870 km/h. Designed in two versions: low-wing (appears like typical bizjet) and more unconventional - high-wing.
Letov L-43 (1960) - STOL light transport and trainer. Two projected M-603 turboprops (1200 to 1400 hp each) or two twinned M-601; 20 to 25 passengers (8 to 10 in VIP configuration). Takeoff run only 15 m!
Letov L-48 (1960) - 24-seat regional airliner with two M-603 engines, designed by eng. Dlouhy.

(Source: V. Nĕmeček. Československa letadla. Vol.2 (1945-1984), Praga, 1984).
 

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Great stuff redstar72! Does Nĕmeček provid any images of these projects?
 

hesham

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Apophenia said:
Hello Hesham. AFAIK, the LG-124 Galánka and LG-125 Sohaj 2 were both LET products not Letov (as was the LG-425 Sohaj 3), and the LG-130 Kmotr (or Z-130) was a product of Moravan Otrokovice (aka Zlin).
Thank you my dear Apophenia,

L-21 sailplane (no more info)
L-33 (E-33) experimental aircraft from L-200
LC-35 mid-wing twin engined cargo aircraft
L-36 low-wing agricultural aircraft,replaced by Z-37
L-300 developed version of L-210
 

Apophenia

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Hesham, do you have a source for that L-36 ag plane?

The others weren't Letov designs. The L-21 Spartak, L-33 Solo, and L-300 were all by LET. The LC-35 project was by Aero.
 

hesham

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Hi,

there is some confusing in L series,and for L-36,its source is the book,
General Aviation by Rod Simpson.
 

hesham

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Hi,

S.9 for 30-passenger
S.10 trainer aircraft
S.11 twin-engined commercial monoplane,may be never completed
 

Apophenia

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Thanks Hesham. As noted, the airliner version of Letov's S-9 bomber project may have been the S-15 'layout 2'. Or, perhaps, S-9 and S-15 were used interchangibly?
 

hesham

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Hi,


L-18 high-wing twin boom light transport aircraft,powered by two engines
L-23 sailplane
L-110 all metal low-wing four seat single engined light aircraft
L-410 & L-420 well known twin engined short range transport aircraft
L-420E & L-420 XXL a developed version of L-410
L-430 was a stretch version of L-410,powered by two turboprop engines
L-450 was a developed project of L-410
L-510 19-seat all metal high-wing pressurized commuter aircraft project,powered by two
turboprop engines
L-539 a single engined business jet aircraft,use the L-39 Albatros parts
L-610 well known twin engined high-wing turboprop medium transport aircraft
 

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hesham said:
Hi,

L-18 high-wing twin boom light transport aircraft,powered by two engines
L-23 sailplane
L-110 all metal low-wing four seat single engined light aircraft
L-410 & L-420 well known twin engined short range transport aircraft
L-420E & L-420 XXL a developed version of L-410
L-430 was a stretch version of L-410,powered by two turboprop engines
L-450 was a developed project of L-410
L-510 19-seat all metal high-wing pressurized commuter aircraft project,powered by two
turboprop engines
L-539 a single engined business jet aircraft,use the L-39 Albatros parts
L-610 well known twin engined high-wing turboprop medium transport aircraft

Dear Hesham,
LET Kunovice and Letov (Prague-Letňany) are two totally different companies!
 

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My dear Redstar72,


of course I know that,but we put them in same topic.
 

hesham

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Hi,


S-26 was developed from S-16 as a modern version,Project.


S-34 was three engined heavy bomber developed from S-30,Project.


S-40 was twin engined twin boom 18-passenger light transport aircraft Project.


S-42 was twin engined twin boom medium bomber developed from S-40,Project.


S-132 was developed from S-15 as transport and bomber aircraft,in both version,Project.


Letectvi magazine
 

hesham

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Hi,


here is the Letov MO-9,may be a sailplane.
 

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Desined by Oldrich Mayer, hence the designation M.O.
 

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Thank you my dear Maveric.
 

hesham

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Hi,

for L designation,we can say,there was;

L-21,L-22,L-42,L-43,L-48,L-52,L-53,LA-54,LA-58,L-101,L-103,L-105,L-106,LF-107,LF-108,LF-109,L-115 ?,L-152,L-154,L-158,
L-201,L-202,LF-207,L-290,L-301 & L-501.
 
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