Certified in 1976, the M74 Wasp was a single-seat piston-engined agricultural/utility modifications of Bell OH-13E (Bell 47) helicopter.
The 1977 M74A Wasp applied the modifications to Bell OH-13H.
M74 Wasp
Engine: Lycoming TVO-435-A1E, 200hp
Rotor: 35’1″
Length: 31’5″
Useful load: 1020 lb
Max speed: 100 mph
Cruise: 80 mph
Range: 150 mi
Seats: 1
M74A Wasp
Engine: Lycoming TVO-435, 240hp
Seats: 1
All Aero 