DescriptionThe Grumman G-21 Goose is an amphibious flying boat designed by Grumman to serve as an eight-seat "commuter" aircraft for businessmen in the Long Island area.
The Goose was Grumman's first monoplane to fly, its first twin-engined aircraft, and its first aircraft to enter commercial airline service. During World War II, the Goose became an effective transport for the US military (including the United States Coast Guard), as well as serving with many other air forces. During hostilities, the Goose took on an increasing number of combat and training roles.
In 1936, a group of wealthy residents of Long Island, including E. Roland Harriman, approached Grumman and commissioned an aircraft that they could use to fly to New York City. In response, the Grumman Model G-21 was designed as a light amphibious transport. Grumman produced a high-wing monoplane of almost all-metal construction—the trailing half of the main wing and all of the flight control surfaces except for the flaps were fabric-covered. It was powered by two 450 horsepower (340 kW) Pratt & Whitney R-985 Wasp Junior nine-cylinder, air-cooled, radial engines mounted on the leading edges of the wings. The deep fuselage served also as a hull and was equipped with hand-cranked retractable landing gear. First flight of the prototype took place on May 29, 1937.
The fuselage also proved versatile, as it provided generous interior space that allowed fitting for either a transport or luxury airliner role. Having an amphibious configuration also allowed the G-21 to go just about anywhere, and plans were made to market it as an amphibian airliner. More than 345 have been built.
A number of modifications were made for the Goose, but the most numerous are those by McKinnon Enterprises of Sandy, Oregon, which holds 21 supplemental type certificates (STCs) for modifying G-21-series aircraft and which also manufactured four different conversions that were recertified under a separate FAA type certificate (TC no. 4A24) as brand-new "McKinnon" airplanes.
For more details on the operational history, modifications and numerous variants, click here.
- Crew: 1-3 Capacity: 5-7
- 38 ft 6 in (11.73 m)
- 49 ft 0 in (14.94 m)
- 16 ft 2 in (4.93 m)
- Wing Area:
- 375 sq ft (34.8 sq m)
- Wing Loading:
- 21.3 lb/sq ft (104 kg/sq m)
- Empty Weight:
- 5,425 lb (2,461 kg)
- 8,000 lb (3,629 kg)
- 2 × Pratt & Whitney R-985-AN-6 Wasp Junior 9-cylinder air-cooled radial piston engines, 450 hp (340 kW) each
- Maximum speed: 201 mph (323 km/h, 175 kn) at 5,000 ft (1,524 m)
- Cruise Speed:
- 191 mph (307 km/h, 166 kn) at 5,000 ft (1,524 m)
- 640 mi (1,030 km, 560 nmi)
- Rate of Climb:
- 1,100 ft/min (5.6 m/s)
- Service Ceiling:
- 21,300 ft (6,500 m)