page_title: Blériot-SPAD S.61
section_title: Variants
hierarchical_section_title: Blériot-SPAD S.61 / Variants
caption_attribution_description: English: Blériot-SPAD S.61/9 photo from L'Aérophile July,1929
context_page_description: The Blériot-SPAD S.61 was a French fighter aircraft developed in 1923. Designed by André Herbemont, the S.61 was a conventional biplane, abandoning the swept upper wing used by Herbemont in several previous designs. The prototype S.61 was evaluated by the French Air Force alongside the S.51 as a potential new fighter, but like its stablemate, was rejected. The Polish Air Force was impressed enough to order 250, as well as purchase licences for local production. The Romanian Air Force also ordered 100 aircraft. About 30 were built in Poland, by the CWL.
context_section_description: S.61/1
  prototype for French evaluation, powered by a 320 kW (430 hp) Lorraine-Dietrich 12E W-12 engine with supplementary supercharger.
  S.61/2
  production version for Poland and Romania, powered by a 340 kW (450 hp) Lorraine-Dietrich 12E W-12 engine with supplementary supercharger.
  S.61bis
  converted S.61/2, powered by a 320 kW (430 hp) Lorraine-Dietrich 12E W-12 engine with supplementary supercharger.
  S.61/3
  single machine with reduced wingspan, powered by a 320 kW (430 hp) Lorraine-Dietrich 12E W-12 engine with supplementary supercharger.
  S.61/4
  single machine with a 360 kW (480 hp) Lorraine-Dietrich 12Ee W-12 engine.
  S.61/5
  three machines with a 340 kW (450 hp) Hispano-Suiza 12Gb W-12 engine.
  S.61/6
  racer prototype converted from the S.61bis, powered by a 320 kW (430 hp) Lorraine-Dietrich 12E W-12 engine with supplementary supercharger.
  S.61/6a:single racer
  S.61/6b:The S.61/6a converted with extra fuel tankage for the 1924 Coupe Michelin race
  S.61/6c:single aircraft built to contest world airspeed record; destroyed in the attempt
  S.61/6d:single aircraft built for unsuccessful attempt on world airspeed record.
  S.61/7
  Powered by a 340 kW (450 hp) Lorraine-Dietrich 12Eb W-12 engine, with Rateau supercharger for world altitude record attempt.
  S.61/8
  A single S.61/5 refitted with a 370 kW (500 hp) Hispano-Suiza 12Hb V-12 engine.
  S.61/9
  single S.61/6d modified for 1929 Coupe Michelin race, powered by a 170 kW (230 hp) Lorraine 7Ma Mizar radial engine.
  S.61Ses
  (Ses for Sesquiplane) This was the final version of the Bleriot S.61, fitted with seaquiplane wings, powered by a 340 kW (450 hp) Lorraine-Dietrich 12Eb W-12 engine. (1 built).
caption: Blériot-SPAD S.61/9 photo from L'Aérophile July,1929
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