The history of the creation of this aircraft dates back to the mid-1930s. At that time, America had recovered from the effects of the Great Depression and had recovered to the point where there was a proposal to create a small twin-engine amphibious seaplane that could carry 4-6 passengers around New York City with the same level of comfort that had been achieved in the legendary Douglas DC-2, but still operate from shorter runways that could only be successfully landed by light and simple training Piper J-3 Cub. For flight safety, the Grumman Goose G21 was equipped with an avionics system from the Douglas DC-2, and wealthy passengers had access to a full-fledged kitchen with the most modern equipment from the mid-1930s and a full-fledged toilet with running water, borrowed from the same Douglas DC-2. Incredibly high (for such a rather weighty machine) takeoff and landing characteristics were provided by a pair of 9-cylinder Pratt & Whitney R-985 Twin Wasp turbocharged medium-pressure cylinder arrangements. The maximum power of each engine was 450 hp, and the large area of the wing and horizontal tail created lift already at a speed of 70 mph (113 km/h), which was achieved in 10-15 seconds after releasing the brakes when both engines were operating in takeoff mode, while flaps were not required for takeoff from the word "absolutely". The organization of the water steering surfaces is also interesting: the Grumman Goose G21 steers on the water surface with the help of an extended wheeled landing gear, which must be released after the instrument speed drops below 40 mph and removed before starting a run-up on the water. Specifically, the Grumman Goose G21A differs from its worthy parent in that it has enlarged fuel tanks that hold 340 gallons (1,312 liters) of gasoline (the original model had only 95 gallons of fuel), which increased the range to 1,300 nautical miles (2,408 km); During World War II, this feature allowed the converted Grumman Goose G21A to be used effectively as anti-submarine patrol aircraft along with the legendary PBY Catalina. Installation instructions are in the archive. Enjoy your flights!