The Goodyear GA-400R Gizmo is a 1950s American light single-seat observation and courier helicopter developed by the Goodyear Aircraft Company. It was left in prototype stage.
The helicopter was designed by Paul Ziegler and made its first flight on 9 May 1954. The first prototype, N62N, was powered by a 32 hp Mercury outboard boat engine. Two more prototypes equipped with a 38 hp Johnson outboard were also built. These were known as the GA-400R-2 and the GA-400R-3, their registration codes were N69N and N53N, respectively. The US Navy tested the GA-400R-3 in 1957, but did not accept it into service.
- Capacity: 1
- Length: 18 ft 4 in (5.59 m)
- Height: 6 ft (1.8 m)
- Empty weight: 290 lb (132 kg)
- Gross weight: 490 lb (222 kg)
- Fuel capacity: 4 gal
- Powerplant: 1 × Johnson Outboard Marine & Mfg. Model RDHE two-stroke engine, 38 hp (28 kW)
- Main rotor diameter: 20 ft (6.1 m)
- Main rotor area: 314 sq ft (29.2 m2)
- Maximum speed: 48 kn (55 mph, 89 km/h)
- Cruise speed: 35 kn (40 mph, 64 km/h)
- Service ceiling: 8,000 ft (2,400 m)
- Rate of climb: 400 ft/min (2.0 m/s)