TheThomas-Morse O-19 was an American observation biplane built by theThomas-Morse Aircraft Company for theUnited States Army Air Corps .
TheO-19 was based on the earlierThomas-Morse O-6 biplane. It was a conventional two-seat biplane of metal construction with fabric-covered wings and tail surfaces. The design was evaluated with a number of different engine installations and the type was ordered into production as theO-19B with a Pratt & Whitney R-1340-7 Wasp radial engine.
XO-19 Improved version of the XO-6 with a 450 hp (340 kW)Pratt & Whitney R-1340-3 engine, one built. YO-20 Similar to the XO-19 with a 525 hp (391 kW)Pratt & Whitney R-1690-1 engine, one built. XO-21 Similar to the XO-19 with a 600 hp (450 kW)Curtiss H-1640-1 engine, one built, later re-engined as the XO-21A. XO-21A The XO-21 fitted with a 525 hp (391 kW)Wright R-1750-1 engine. O-19 Service evaluation aircraft with a 500 hp (370 kW)Pratt & Whitney R-1340-9 , two built. O-19A O-19 without the 88 US Gallon main fuel tank, one built. O-19B Production version with a 450 hp (340 kW)Pratt & Whitney R-1340-7 engine, two machine-guns and modified cockpit, 70 built. O-19C O-19B with tailwheel, ring cowl and minor changes, 71 built. O-19D One O-19C converted as a VIP staff transport with dual controls. O-19E O-19C with extended upper-span wing and a 575 hp (429 kW)Pratt & Whitney R-1340-15 engine, 30 built. O-21 O-19 with 600 hp (450 kW)Curtiss H-1640 Chieftain engine, one built, one converted. YO-23 XO-19 with a 600 hp (450 kW)Curtiss V-1570-1 Conqueror engine, one built. Y1O-33 One O-19B re-engined with a 600 hp (450 kW)Curtiss V-1570-11 engine and revised tail surfaces, one converted. Y1O-41 A sesqui-plane conversion of the Y1O-33 with a 600 hp (450 kW)Curtiss V-1570-79 engine, one converted. Later modified byConsolidated Aircraft as theirModel 23 and exported to Mexico. Y1O-42 High-wing monoplane version of the Y1O-41, static test airframe only.[ 1] Philippines United States [ edit ] Data from The Illustrated Encyclopedia of Aircraft (Part Work 1982-1985), 1985, Orbis Publishing, Page 3000
General characteristics
Crew: twoLength: 28 ft 4 in (8.64 m)Wingspan: 39 ft 9 in (12.12 m)Height: 10 ft 6 in (3.20 m)Wing area: 348 sq ft (32.33 m2 )Empty weight: 2,722 lb (1,235 kg)Gross weight: 3,800 lb (1,724 kg)Powerplant: 1 ×Pratt & Whitney R-1340-7 Wasp radial piston engine , 450 hp (336 kW)Performance
Maximum speed: 137 mph (220 km/h, 119 kn)Service ceiling: 20,500 ft (6,250 m)Armament
2 x 0.3in (7.62mm)machine-guns (one fixed forward-firing, one movable in rear cockpit) Related development
Related lists
Notes Bibliography John Andrade, U.S.Military Aircraft Designations and Serials since 1909, Midland Counties Publications, 1979,ISBN 0-904597-22-9 The Illustrated Encyclopedia of Aircraft (Part Work 1982-1985), 1985, Orbis Publishing, Page 3000
Thomas Brothers Thomas-Morse
Manufacturer designation By role
Trainers Observation aircraft Fighters Patrol Bombers Transports Reconnaissance
USAAC/USAAF sequence Tri-Service sequence
1 Unconfirmed
