Two prototypes were built, the first flying in mid-1931.
==Letalski H-motorji==*Lycoming** Lycoming H-2470 H-24 "hyper engine"*Fairey Aviation**Fairey Prince (H-16) (1939) - 1500 KM**Fairey Monarch (1939) - H-24 2240 KM*Klöckner-Humboldt-Deutz DZ 720 - H-32, 102,9 L*Napier & Son, UK.