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Grumman G-21 Goose / JRF



The G-21A eight-seat commercial amphibian first flew in June 1937 and was Grumman's first aircraft produced for the private and commercial market.
Proving successful, 20 were delivered prior to 1 October 1938. The G-21 was adopted by the US Navy, under the designation JRF, first entering service in 1939, and by the US Navy as the JRF-5. However most of the 300 or so aircraft built went into military service, The US Navy initially received JRF-1s and the US Coast Guard JRF-2s in 1939-40.
The series included JRF-1A aircraft, fitted for target towing and photography and JRF-3 fitted with anti-icing equipment and autopilot for use in northern waters by the US Coast Guard.
The JRF-4 was a development of the JRF-1, and JRF-5 (OA-9) for the USAAF and fitted for photography.
The JRF-6B was a navigational trainer.
The JRF-5s also served with the RCAF and the JRF-5 and -6 with the RAF as the Goose.


JRF-5 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.
More than 300 of the G-21A Goose series with 450 hp Pratt & Whitney engines were built just before and during World War II.


Large numbers of' these amphibians were still used by the U S Navy and Coast Guard for an-sea rescue and transport duties in 1955.

After the war McKinnon Enterprises began a conversion programme, replacing the original 335kW Pratt & Whitney R-985-AN-6 engines with four 253kW 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 This programme was superseded by the turboprop-powered G-21C, D and G Turbo-Goose conversions, initiated in 1966.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 turboprop version is powered by two 680 shp / 507kW Pratt & Whitney Aircraft of Canada PT6A turboprop engines. Other improvements include retractable wing floats and increased fuel capacity.

Grumman G 21 A / JRF Goose
Engine: 2 x Pratt&Whitney R-985-AN6 Wasp Junior, 450 hp
Length: 38 ft 4 in / 11.68 m
Height: 15 ft / 4.57 m
Wingspan: 49.016 ft / 14.94 m
Wing area: 375.018 sq.ft / 34.84 sq.m
Max take off weight: 7955.6 lb / 3608.0 kg
Weight empty: 5426.5 lb / 2461.0 kg
Max. speed: 174 kts / 323 km/h / 201 mph
Cruising speed: 166 kts / 307 km/h
Service ceiling: 21,000 ft / 6400 m
Cruising altitude: 5003 ft / 1525 m
Wing load: 21.32 lb/sq.ft / 104.0 kg/sq.m
Range: 556 nm / 1030 km
Fuel capacity 220.
Crew: 2
Seats: 4-6


JRF-5 Goose
Engines: two 450 h.p. Pratt and Whitney R-985-N-6
Span: 49 ft
Weight: 8,500 lb
Max Speed: 180 mph
Maximum range: 800 miles approx
Crew: 2-6

McKinnon Turbo Widgeon G-21E
Engines: 2 x P&WAC PT6-27, 715 hp.
Wing loading: 33.1 lb/sq.ft.
Pwr loading: 7.3 lb/hp.
Max TO wt: 10,500 lb.
Empty wt: 6635 lb.
Equipped useful load: 3507 lb.
Payload max fuel: 0 lb.
Range max fuel/ cruise: 1131 nm/5.8 hr.
Service ceiling: 20,000 ft.
Max cruise: 174 kt.
Stall: 73 kt.
1.3 Vso: 95 kt.
ROC: 2000 fpm.
SE ceiling: 12,000 ft.
Min field length - land: 1500 ft.
Fuel cap: 3956 lb.
Seats: 10.

McKinnon G-21G Turbo Goose
Engines: 2 x Pratt -Whitney Canada PT6A-27, 507kW / 680 shp
Wingspan: 15.49 m / 50 ft 10 in
Length: 12.06 m / 39 ft 7 in
Wing area: 35.08 sq.m / 377.60 sq ft
Max take-off weight: 5670 kg / 12500 lb
Empty wt: 6635 lb
Equipped useful load: 5507 lb.
Payload max fuel: 1551 lb.
Fuel cap: 3956 lb
Wing loading: 33.1 lb/sq.ft.
Pwr loading: 9.19 lb/hp.
Max. speed: 391 km/h / 243 mph
Max  cruise: 174 kt.
Stall: 73 kt.
1.3 Vso: 95 kt.
ROC: 2000 fpm.
Service Ceiling: 6095 m / 20000 ft
SE ceiling: 12,000 ft.
Min field length - land: 1500 ft.
Range max fuel/ cruise: 1131 nm/5.8 hr.
Seats: 13



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