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The Thomas-Morse O-19 was an American observation biplane built by the
Thomas-Morse Aircraft Company for the
United States Army Air Corps .
Development
The O-19 was based on the earlier
Thomas-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 the O-19B with a Pratt & Whitney R-1340-7 Wasp radial engine.
Variants
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 by
Consolidated Aircraft as their Model 23 and exported to Mexico.
Y1O-42
High-wing monoplane version of the Y1O-41, static test airframe only.
[1]
Operators
Philippines
United States
Specifications (O-19B)
Data from The Illustrated Encyclopedia of Aircraft (Part Work 1982-1985), 1985, Orbis Publishing, Page 3000
General characteristics
Crew: two
Length: 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)
See also
Related development
Related lists
References
Notes
Bibliography
John Andrade, U.S.Military Aircraft Designations and Serials since 1909, Midland Counties Publications, 1979,
ISBN
0-904597-22-9 (Page 137 and 138)
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(1924–1942) Tri-service sequence(1962–present)
1 Unconfirmed