The most unique feature of the B-36 was its unusual hybrid propulsion system, combining both propeller and jet engines.

The Convair B-36 was soon to be obsolete ... Powered by four turboprop engines, the Model 1211-J was a colossus—160 feet long with a wingspan of 227 feet, about the size of the Convair behemoth ...

On April 18, 1952, the Convair YB-60 took to the skies for the first time. Developed as a jet-powered evolution of the B-36 ...