In 1937 Grumman developed with the design G-21 a flying boat for six to seven passengers. Its civil designation was G-21A and in 1938 the Navy became interested in the design and ordered a G-21 with the designation XJ3F-1. Later on the designation was changed to JRF to fit to the Goose' utility transport role.
All in all, one prototype XJ3F-1, 12 JRF-1s, seven JRF-2s, 3 JRF-3s, 11 JRF-4s and 185 JRF-5s plus another 50 JRF-6Bs for the British armed forces. The Goose served primarily as a utility transport, but also as a target towing aircraft, as photographic reconnaissance aircraft or navigation trainer.
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