The buzz word in the automobile industry today is “hybrid.” Pure electric-powered cars didn’t quite make it, so support was withdrawn by the feds. Alternate-power-means are the new key words, hybrids, synthetic fuel, fuel cells and further refinements of pure electrics. Now the aviation industry is also looking for alternate propulsion which very well might include electric/diesel hybrids.
When the first turbine jets were developed in the mid 1930s they didn’t quite earn the trust of the designers. In 1939 Italy’s Campini Caproni CC.1 used a propless radial gas engine to turn the compressor blades of the jet engine so they could pump fuel into it, ignite it, and turn the rig into a crude jet engine. The plane did fly, but not well enough to warrant further study or production; in effect it was the world’s first hybrid. Italy dropped all jet research until much later.
Back in the USA, during the late 1940s, Ryan designed, built and produced the Fireball, a Navy fighter with a large radial engine in the nose plus a jet engine in the tail, another hybrid tested and used briefly, then retired.

Ryan Fireball
As jet engines became more available and dependable, they were added as auxiliary power plants to existing aircraft, like the Fairchild C-119 Stinger Gunship, the Fairchild/Chase C-123J Provider and others. In essence, aircraft equipped with after burners are sort-of hybrids, as they use jet turbines for main propulsion and ram jets (afterburners) installed in the tail pipes, when extra thrust is needed; two entirely different types of jet propulsion.

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