Kellett YG-1

Cierva and Pitcairn licensed the Kellett Autogiro Corporation of Philadelphia to build autogiros and the developed Kellett YG-1 of the late 1930s became the US Army's first rotary-winged aircraft.
Seven YG-1B autogyro were procured by the US army in 1937 for observation duties.

YG-1A
Year: 1936.
Seats: 2.
Engine: Jacobs L4MA7, 225 hp.
Gross wt: 2205 lbs.
Empty wt: 1586 lbs.
Rotor dia: 40 ft.
No of blades: 3.

YG-1B
Year: 1937.
Seats: 2.
Engine: Jacobs L4MA7, 225 hp.
Gross wt: 2400 lbs.
Empty wt: 1617 lbs.
Rotor dia: 40 ft.
No of blades: 3.