The Pratt & Whitney R-1860 Hornet B was a aircraft engine introduced in 1929. It was in use with following aircrafts. Bellanca C-27 Airbus Boeing Monomail Boeing YB-9 Consolidated Commodore Consolidated Fleetster Fokker F-32 Keystone B-4A Keystone LB-8 (prototype only) Keystone XLB-12 (engine evaluation testbed only) Martin XT6M (prototype only) Sikorsky S-40 Sikorsky S-41