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| The G-21A eight-seat commercial amphibian flew for the first time in June 1937 and was Grumman's first aircraft produced for the private and commercial market. It proved outstandingly successful and 20 were delivered prior to 1 October 1938, when many more were on order. However most of the 300 or so aircraft built went into military service, the US Navy receiving initially JRF-1s and the US Coast Guard JRF-2s in 1939-40.
Further series included JRF-1A aircraft, fitted for target towing and photography; JRF-3 fitted with anti-icing equipment and autopilot for use in northern waters by the US Coast Guard; JRF-4, a development of the JRF-1; JRF-5 (OA-9) for the USAAF and fitted for photography; and the JRF-6B navigational trainer. JRF-5s also served with the RCAF and the JRF-5 and -6 with the RAF as the Goose. Production of the JRF ceased in September 1945, but the type continued to serve as a general/utility amphibian with the US Navy and Coast Guard.
After the war McKinnon Enterprises began a conversion programme, replacing the original 335.3kW Pratt & Whitney R-985-AN-6 engines with four 253.4kW Lycoming GSO-480s and incorporating other refinements to produce executive transports. This programme was superseded by the turboprop-powered G-21C, D and G Turbo-Goose conversions, initiated in 1966. The latter is the current version, powered by two 507kW Pratt & Whitney Aircraft of Canada PT6A turboprop engines.
| MODEL | G-21G "Turbo Goose" |
| ENGINE | 2 x Pratt -Whitney Canada PT6A-27, 507kW |
| WEIGHTS |
| Take-off weight | 5670 kg | 12500 lb |
| Loaded weight | 3039 kg | 6700 lb |
| DIMENSIONS |
| Wingspan | 15.49 m | 51 ft 10 in |
| Length | 12.06 m | 40 ft 7 in |
| Wing area | 35.08 m2 | 377.60 sq ft |
| PERFORMANCE |
| Max. speed | 391 km/h | 243 mph |
| Ceiling | 6095 m | 20000 ft |
| Range | 2575 km | 1600 miles |
 | A three-view drawing (1436 x 1040) |
| Neal Robertson, e-mail, 02.09.2010 06:29 I worked for Avalon Air Transport,Catalina Airlines, Catalina Seaplanes, and Air Catalina from 1956 to 1959. Then I worked at San Clemente Island for 4 years. We rode out and back on Gruman gooses and other aircraft. All the civilians working there on missile projects went thru my office to get on and off the island. In 1964, I went back to the Catalina Airlines flying in and out of San Pedro. When the gooses changed hands, I went with them to work for the new owner. I knew all the goose owners including Bob Hanley, Dick Probert, Paul Briles, and Jackson Hughes to name a few. reply | | George Reeberg, e-mail, 22.01.2010 21:14 I remember riding in these planes between St. Croix and St. Thomas in the 1970's as a kid. You could sit in the co-pilot's seat back then as a pax. reply | | George Reeberg, e-mail, 22.01.2010 21:14 I remember riding in these planes between St. Croix and St. Thomas in the 1970's as a kid. You could sit in the co-pilot's seat back then as a pax. reply | | Michael P. Jungers, e-mail, 16.01.2010 20:10 In the Summer of 1941,the Army Air Corps had OA-9s in the Philippines.See page 30 of Pacific War Eagles by Jeffery L. Ethell /Warren M. Bodie 1997.Widewing Publications.The Tail number is:176 /20AB;the Goose is shown in colour at IBA Airfield.I cannot find any listed in my references or what happened when war came....ANY CLUES or other references. reply | |
| | Dominick J Porto, e-mail, 31.03.2009 17:38 where may I get a set of bluprinte for the construction of this aircraft using composits? Much obliged. reply | | Donald McKinney, e-mail, 10.03.2008 15:21 I am attempting to write missions and "saved flights" for MS FSX. I am intrested in information /history on known flights for the US NAVY. ESPECIALLY information concerning if they were used in the Solomon islands (or just PBYs). reply | | Robertr L Collie, e-mail, 05.09.2007 23:19 The Navy had one of these stationed in Keflovic Airforce Base, Iceland when I was there in 1957-1958.But so far I havenot been able to find anything about it.It was with a P2V outfit. reply | | Vova, e-mail, 09.05.2007 06:46 it is a very good airplain.I want to know more about the gears of G-21A.If anyone know something of my quastion,please wright me. reply | | garey, e-mail, 07.02.2007 20:29 are these aircraft available to download into simulator x ? reply | | someguy, e-mail, 03.04.2007 17:44 its a defulet aircraft in FSX reply |
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