The Internal Combustion Catapult. The C14 Internal Combustion Catapult was developed in the 1950s and successfully launched planes. Used the same launch engine as the steam catapult. Was more powerful than the steam catapult. Used JP5 and compressed air burned in a single large combustor.
Allows alternative ship concepts and ship types to function as aircraft launch and recovery platforms like the baby flat-tops of WWII.