Topic summary
X-24 engine
Extracted from the Wikipedia article X24 engine.
The X-24 is one of the few configurations of X-type engines known to have been produced. The design consists of four banks of six cylinders with a common crankshaft. This is lighter than other multi-bank designs, which require multiple crankshafts. Few of the X-24 engines developed saw service, and their production lifetimes were very limited. Postwar developments of the turbojet and turbofan engines obviated the need for large piston aircraft engines of this type.