| 词条 | Great Lakes XSG | ||||||||||||||||
| 释义 |
The Great Lakes XSG was an amphibious observation aircraft developed in the United States in the early 1930s for a US Navy competition. It was an ungainly and unorthodox biplane design with a single large pontoon mounted below the lower wing. This pontoon extended rearwards and carried the conventional empennage. On top of the lower wing, where the fuselage would normally be located, was a stubby nacelle containing the tractor-mounted engine and the pilot's cockpit. The rear of this nacelle was semi-enclosed with glazing and incorporated a position for a tail gunner. The main units of the wheeled undercarriage retracted into the sides of the central pontoon. Development quickly ended when trials revealed that the aircraft was incapable of reaching the speeds required by the Navy, and only a single prototype was ever built. Specifications{{aerospecs|ref= |met or eng?=eng |crew=Two, pilot and gunner |capacity= |length m=9.90 |length ft=32 |length in=7 |span m=10.60 |span ft=35 |span in=0 |height m=3.90 |height ft=13 |height in=0 |wing area sqm= |wing area sqft= |aspect ratio= |empty weight kg= |empty weight lb= |gross weight kg=1,912 |gross weight lb=3,219 |eng1 number=1 |eng1 type=Pratt & Whitney R-985 |eng1 kw=300 |eng1 hp=400 |max speed kmh=219 |max speed mph=136 |cruise speed kmh= |cruise speed mph= |range km= |range miles= |endurance h= |endurance min= |ceiling m=4,480 |ceiling ft=14,700 |glide ratio= |climb rate ms= |climb rate ftmin= |armament1=1 × trainable, rearward-firing machine gun in aft cockpit |armament2= |armament3= |armament4= |armament5= |armament6= }}{{aircontent |see also= |related= |similar aircraft= |lists= }} References{{commons category|Great Lakes Aircraft Company}}
6 : Great Lakes aircraft|United States military reconnaissance aircraft 1930–1939|Single-engined tractor aircraft|Biplanes|Amphibious aircraft|Aircraft first flown in 1931 |
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