Pratt & Whitney R-1860 Hornet B
| R-1860 Hornet B | |
|---|---|
| Pratt & Whitney R-1860 Hornet B | |
| Type | Radial engine |
| National origin | United States |
| Manufacturer | Pratt & Whitney |
| First run | 1929 |
| Major applications | Consolidated Fleetster Keystone B-4 Sikorsky S-40 Sikorsky S-41 |
| Developed from | Pratt & Whitney R-1690 |
The Pratt & Whitney R-1860 Hornet B was a relatively uncommon aircraft engine. It was a development of Pratt & Whitney's earlier R-1690 Hornet and was basically similar, but enlarged in capacity from 1,690 to 1,860 cubic inches (30.5 L). Cylinder bore was increased by 1/8" and the crankshaft stroke by 3/8". Both engines were air-cooled radial engines, with a single row of nine cylinders.