The Ca.20 was derived from the
Ca.18, an observation monoplane that had been developed starting in 1913 from the previous models Ca.8 and Ca.16. It used a more powerful engine, the Rhône. It used an unusual rounded nose cover for the wooden propeller which was cowled smoothly to match the fuselage. The cover was pierced to allow cooling of the engine. The improved aerodynamics helped speed and manoeuvrability. Designed as a fighter, a
Lewis machine gun was installed above the pilot, placed above the propeller disc, with an eye level sight. The first synchronization devices, which allowed a weapon to shoot with confidence through the blades of a propeller in motion, would not make their appearance until the
Fokker Eindecker during 1915, although many experiments had been conducted by the French since 1913. ==History of the prototype==