The Blériot SPAD S.510 was the last French bi-plane fighter to be produced.
The S.510 was doomed to obsolescence before it even flew. Though at the time it was designed, many pilots and experts strongly believed that biplanes would prove better fighters than monoplanes because of their tighter turning circles.
Largely overshadowed by the faster Dewoitine D.510 monoplane, an order of 60 planes was secured in August 1935 when French ace pilot Louis Massot demonstrated the S.510 to excellent effect showing its superior maneuverability and rate of climb.
Despite its strengths, the S.510 only enjoyed about a year of utility. A decent fighter for 1936, it was quickly overshadowed by the new, modern monoplanes developed by Germany, England, and France. It had fixed landing gear as well as a weak fuel system and undercarriage.
Twenty-seven examples were reported delivered to the Spanish Republican Air Force during the Spanish civil war (sometimes the number is 15), but there is no evidence that they were ever actually sent.
The S.510 saw service with the Armée de l'Air (60), and possibly the Spanish "Escuadrilla Internacional" (15-27?)
Total production (including prototypes): 61
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