Developed in 1958, the Model 107 is an Amphibious transport prototype helicopter. Designated YHC-1A in the US Army, under which the helicopter made its first flight as a military aircraft in August 1959. Capable of operation in any weather condition, equipped with a Stability Augmentation System (SAS) device.
Source: Paul Lambermont with Anthony Pirie. Helicopters & Autogyros of the World. Cassell & Company, 1959. Pages 400-401.
VTOL type: Helicopter
Lift configuration: Tandem (Fore/aft) (x2)
Crew required: 2
Crew seating: Side-by-side
Landing gear: Wheels (non-retractable)
Overall Height: 5.13 m (16.8 ft)
Overall Length: 25.40 m (83.3 ft)
Overall Width: 15.24 m (50.0 ft)
Max Gross Weight (ground): 9707 kg (21400 lb)
Max Range: 431 km (233 nm)