The R985 features a built-in centrifugal supercharger and direct-drive propeller. The R-985 was in production from 1930 through 1953. Over 39,000 were produced.
The Wasp Junior was used on the Vultee BT-13 Valiant, Beechcraft -18 Expeditor (and its AT-7 and AT-11 variants), and the DeHavilland L-20A Beaver.
Specifications
| Manufactured by: | Pratt and Whitney |
| Power: | 450 h.p. @ 2300 r.p.m |
| Cylinders: | 9; radial; aircooled |
| Displacement: | 985 cu. in. |
| Weight: | 668 pounds |
| First manufactured: | 1929 |
