Object Details
Manufacturer
Lycoming (Williamsport, Pennsylvania)
Physical Description
Type: Reciprocating, 9 cylinders, radial, air-cooled
Power rating: 220 kW (295 hp) at 2,300 rpm
Displacement: 11.1 L (680 cu in)
Bore and Stroke: 117 mm (4.6 in.) X 114 mm (4.5 in.)
Weight: 248 kg (547 lb)
Summary
Lycoming began as a subsidiary of the Auburn Auto Company, and the R-680 was a development version of its first 138 kW (185 hp) aircraft engine. It was one of a number of engines designed to replace the ubiquitous Curtiss OX-5 following World War I. The R-680 was type certificated in early-1930, and originally rated at 157 kW (210 shp). Considered a very reliable engine, more than 26,000 were built before production ended following World War II.
The R-680 powered the Stearman PT-13 primary American military trainer during the 1930s and 1940s, for which more than 2,000 engines were built. This model R-680-9 was an Army Air Forces engine that powered the Stinson L-1 and L-12, Curtiss AT-9/A, Beech AT-10, Stearman PT-9B, and Stinson CQ-2 aircraft.
Credit Line
Gift of San Jose State University
Date
Circa 1940
Inventory Number
A19860279000
Restrictions & Rights
Usage conditions apply
Type
PROPULSION-Reciprocating & Rotary
Materials
Magnesium Alloy
Steel
Aluminum
Stainless Steel
Copper Alloy
Rubber
Paint
Phenolic Resin
Natural Fabric
Paper
Dimensions
Approximate: 99.1 × 109.2 × 109.2cm (39 × 43 × 43 in.)
Storage: 134.6 × 132.7 × 162.6cm (53 in. × 52 1/4 in. × 64 in.)
Overall: 547lb. (248.1kg)
Other: 43 1/4 x 37 1/2in. (109.9 x 95.3cm)
Country of Origin
United States of America
See more items in
National Air and Space Museum Collection
Data Source
National Air and Space Museum
Link to Original Record
Record ID
nasm_A19860279000