The United States entry will consist of two XP-35 pursuit craft developed by Howard Hughes from his H-1 Racer. The major changes involve the addition of twin .30 Machine Guns in the cowl and a slightly raised cockpit and canopy to improve visibility. (Basically its a militarized version of the H-1 Long Wing version.)
Hughes XP-35
General characteristics
Crew: 1
Length: 27 ft 0 in (8.23 m)
Wingspan: 31 ft 9 in (9.67 m)
Wing area: 138 ft² (12.8 m²)
Empty weight: 3,565 lb (1,620 kg)
Loaded weight: 5,492 lb (2,496 kg)
Powerplant: 1× Pratt & Whitney R-1535[3] radial engine, 700 hp (521 kW)
Armament: 2x 0.30 Machine Guns
Performance
Maximum speed: 352 mph (566 km/h)
Wing loading: 40 lb/ft² (195 kg/m²)
Power/mass: 0.13 hp/lb (210 W/kg)
Pilots are Major Doolittle and Lt. Bart Hawk, both of the Army Air Corps. Both aircraft and their support crews will be carried to the meet aboard the airship Macon, which will sail down the Atlantic coast of South America to Argentina. The aircraft will not be equipped with skyhooks.