The Grumman G-21 Goose is a twin-engine amphibian developed in the 1930s as an executive air yacht for travel between Long Island and Manhattan. Its metal flying-boat hull, retractable wheeled landing gear, high wing, and compact cabin let the same aircraft operate from runways and water. The design expanded into airline, military transport, freight, and remote-area utility service, remaining useful long after production ended and inspiring later piston and turboprop conversions.
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