Stealth

prop driven aircraft are also give away IR signatures (their engines produce heat as they are combustion engines and have exhaust)...so that would improve anything

 

yeah but props don't rely on hot air to fly the plane, unlike jets

 

Jets don't rely on hot air either, jet engines heat air, but they don't need hot air. A piston engine generates heat and a jet engine generates heat, neither relies on hot air in the slightest.

 

Jet
Hot air expands-> leaves jet -> produces thrust-> moves plane

Prop
Propeller spins-> produces thrust-> moves plane

that kind of need

Jet with no hot air produced= basically no engine