|Douglas O-46A at National Museum of the United States Air Force|
|Manufacturer||Douglas Aircraft Company|
|Primary user||United States Army Air Corps|
Design and development
The O-46A, the last of a long line of Douglas observation planes, was a victim of progress. It was designed to operate from established airfields behind fairly static battle lines as in World War I. However, in 1939, a report was issued on the O-46A which stated that it was too slow and heavy to outrun and outmaneuver enemy pursuit aircraft, too heavy to operate from small, wet, unprepared fields, and too large to conceal beneath trees. This report was a forecast of the future, for World War II with its rapidly changing battle lines proved the need for light, maneuverable observation aircraft which could operate from unimproved airstrips. Consequently, in 1942, the "O" (observation) designation was changed to "L" (liaison).
The O-46 was a development of the earlier Douglas O-43. The 24th airframe of the O-43A contract was completed as the XO-46 prototype, with a revised wing and an engine switch, from the O-43's inline engine to a radial engine, the Pratt & Whitney R-1535-7. The Air Corps ordered 90 O-46As in 1935. They were built between May 1936 and April 1937.
At least 11 O-46s saw overseas duty; two were destroyed in the Japanese raid on Clark Field in the Philippines on 8 December 1941. The Maryland Air National Guard operated O-46A's off the coast of New Jersey for anti-submarine duty. The remainder were declared obsolete in late 1942 and after that were used primarily in training and utility roles.
A proposed variant with a Wright R-1670-3 engine received the designation O-48 but was not built.
On 27 November 1942, O-46A, 35-179, of the 81st Air Base Squadron, landed downwind at Brooks Field, Harlingen, Texas, ran out of runway and overturned. Written off, it was abandoned in place. More than 20 years later it was discovered by the Antique Airplane Association with trees growing through its wings, and in 1967, it was rescued and hauled to Ottumwa, Iowa. Restoration turned out to beyond the organization's capability, and in September 1970, it was traded to the National Museum of the United States Air Force for a flyable C-47. The (then) Air Force Museum had it restored at Purdue University, and placed it on display in 1974, the sole survivor of the 91 O-46s built.
Data from McDonnell Douglas Aircraft since 1920 
- Length: 34 ft 6¾ in (10.54 m)
- Wingspan: 45 ft 9 in (13.94 m)
- Height: 10 ft 8½ in (3.25 m)
- Wing area: 332 ft² (30.8 m²)
- Empty weight: 4,776 lb (2,166 kg)
- Loaded weight: 6,639 lb (3,011 kg)
- Powerplant: 1 × Pratt & Whitney R-1535-7 14-cylinder radial engine, 725 hp (541 kW)
- Maximum speed: 200 mph (174 knots, 322 km/h)
- Cruise speed: 171 mph (149 knots, 275 km/h)
- Range: 435 miles (378 nmi, 700 km)
- Service ceiling: 24,150 ft (7,360 m)
- Rate of climb: 1,765 ft/min (9.0 m/s)
- "Douglas Aircraft Builds the DC-1 and DC-2." U.S. Centennial of Flight Commission, 2003. Retrieved: 27 September 2007.
- Armstrong 2005, p. 50.
- Fuller, Craig. "November 1942 USAAF Stateside Accident Reports." Aviation Archaeological Investigation and Research, 2008. Retrieved: 21 April 2012.
- Westburg, Peter W. and Peter M. Bowers. "The Parasols of Santa Monica". Wings, Volume 4, Number 2, April 1974, pp. 68–69.
- Francillon 1979, p. 134.
|Wikimedia Commons has media related to Douglas O-46.|
- Douglas O-46 at Ugolok Neba (in Russian, with drawings and photos)
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