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 Pratt & Whitney R-1340-3 engine, one built. YO-20 Similar to the XO-19 with a Pratt & Whitney R-1690-1 engine, one built. XO-21 Similar to the XO-19 with a Curtiss H-1640-1 engine, one built, later re-engined as the XO-21A. XO-21A The XO-21 fitted with a Wright R-1750-1 engine. O-19 Service evaluation aircraft with a 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 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 Pratt & Whitney R-1340-15 engine, 30 built. O-21 O-19 with Curtiss H-1640 Chieftain engine, one built, one converted. YO-23 XO-19 with a Curtiss V-1570-1 Conqueror engine, one built. Y1O-33 One O-19B re-engined with a Curtiss V-1570-11 engine and revised tail surfaces, one converted. Y1O-41 A sesqui-plane conversion of the Y1O-33 with a 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.Designation systems

Operators

Philippine Army Air Corps

United States Army Air Corps

Specifications (O-19B)

See also

References

Notes

Bibliography John Andrade, U.S.Military Aircraft Designations and Serials since 1909, Midland Counties Publications, 1979, (Page 137 and 138) The Illustrated Encyclopedia of Aircraft (Part Work 1982-1985), 1985, Orbis Publishing, Page 3000