Grumman G-21
| Grumman G-21 Goose | |
|---|---|
|
|
| Type: | Multipurpose amphibious aircraft |
| Design country: | |
| Manufacturer: | |
| First flight: |
May 29, 1937 |
| Commissioning: |
1938 |
| Number of pieces: |
345 |
The Grumman G-21 Goose ( German goose ) is a twin-engine amphibious aircraft in all-metal construction from the US manufacturer Grumman Aircraft .
development and construction
The G21 is designed as a shoulder wing and has a retractable landing gear. It was planned in 1937 as a six- to seven-seat business jet for business people (such as department store owner Marshall Field , financier E. Roland Harriman and banker Henry Morgan) in coastal areas such as Long Island . In addition, the flying yachts were equipped with cabins for two to three people as well as an on-board bar and a toilet. But soon she was already being used by the US Navy and the US Coast Guard as a reconnaissance, transport and rescue aircraft.
During the Second World War , the machines were also used by the Canadian Air Force and the Royal Air Force as a rescue and transport aircraft.
After the war, many of the 345 machines built were used again in civil aviation. About 60 copies are still airworthy today. As the type certificate still exists, the former tax advisor V. L. Franklin plans to re-produce a modernized version in Graham (North Carolina) after purchasing the rights including the construction drawings . These are to be equipped with Pratt & Whitney PT6A engines with 500 kW power, which have already been retrofitted on some Goose and enable a cruising speed of over 370 km / h and a range of more than 2200 km. The first “Super Goose” should take off on its maiden flight in the second quarter of 2009. The target sales price was around three million US dollars.
This type of aircraft has a central role in the series The Sky Dogs of Boragora , the main character of which is the pilot and owner of a G-21.
The last Goose used in the liner service was decommissioned on December 21, 2012 at the Alaska operating company PenAir . This G-21A with the registration number N985R has been part of the Collings Foundation Collection since August 2013.
production
Construction figures of the Grumman Goose:
| version | 1937 | 1938 | 1939 | 1940 | 1941 | 1942 | 1943 | 1944 | 1945 | TOTAL |
|---|---|---|---|---|---|---|---|---|---|---|
| G-21 | 12 | 12 | ||||||||
| G-21A | 12 | 11 | 5 | 1 | 1 | 30th | ||||
| XJ3F-1 | 1 | 1 | ||||||||
| OA-9 | 1 | 25th | 26th | |||||||
| JRF-1 | 4th | 1 | 5 | |||||||
| JRF-1A | 3 | 2 | 5 | |||||||
| JRF-2 | 3 | 4th | 7th | |||||||
| JRF-3 | 3 | 3 | ||||||||
| G-21B | 12 | 12 | ||||||||
| JRF-4 | 3 | 7th | 10 | |||||||
| JRF-5 | 15th | 12 | 45 | 77 | 35 | 184 | ||||
| JRF-6B | 37 | 13 | 50 | |||||||
| TOTAL | 12 | 14th | 46 | 30th | 60 | 26th | 45 | 77 | 35 | 345 |
Military users
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- United States Army Air Corps
- United States Army Air Forces
- United States Navy
- United States Coast Guard
Technical specifications
| Parameter | Data |
|---|---|
| crew | 1 |
| Passengers | 5-6 |
| length | 11.7 m |
| span | 14.9 m |
| height | 3.7 m |
| Empty mass | 2527 kg |
| Takeoff mass | 3720 kg |
| Top speed at an altitude of 1520 m | 296 km / h |
| Service ceiling | 6400 m |
| Range | 1690 km |
| Engines | two Pratt & Whitney R-985 (Wasp Junior) SB-2 with 340 kW (462 PS) each |
| Armament | 2 × machine guns, 2 × 120 kg depth charges |
Web links
Individual evidence
- ↑ FliegerRevue November 2008, pp. 20–21, The goose is back at the start
- ↑ John Kenneth Muir: Tales of the Gold Monkey 1982–83: A Retrospective by John Kenneth Muir , johnkennethmuir.com (2004).
- ^ Collings get a Goose . In: Airplane Monthly November 2014, p. 14
- ↑ Knight, Fred J .: The Grumman Amphibians - Goose, Widgeon & Mallard, Dorchester 2013