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Hybrid jet-propeller planes in real lift where a weird thing that existed in the 40s & 50s, no type of them ever saw combat use or even limited production. In modern day not even much research is done on them. But what could allow them to see significant military use? The level of technology is near future.

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    $\begingroup$ What is a "hybrid jet-propeller aircraft"? The answers mention the Republic XF-84H, but that was an ordinary turboprop aircraft, not any kind of hybrid. (There are many turboprop aircraft in former or current military use, from the Embraer EMB 314 Super Tucano to the legendary Tupolev Tu-95.) $\endgroup$
    – AlexP
    Oct 7 '21 at 16:55
  • $\begingroup$ @AlexP this is a better example: en.wikipedia.org/wiki/Consolidated_Vultee_XP-81 $\endgroup$
    – OT-64 SKOT
    Oct 7 '21 at 21:58
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    $\begingroup$ @OT-64SKOT The problem of a hybrid like XP-81 would be that it is usually more efficient to just take more fuel rather then whole additional engine. At high speed propeller itself becomes major source of drag and may slow you down even if powered, so jet+prop just do not work. You would either use jet engine or turboprop (it is sort of combined jet and prop in single engine) $\endgroup$
    – Archelaos
    Oct 7 '21 at 23:03
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what could allow them to see significant military use?

If there was no material enabling the construction of pure, jet only engines, turbo-propellers would become the limit for airplane propulsion, and therefore make this the cutting edge of technology.

They would probably need to be improved from the early prototypes like the Republic XF-84H

The XF-84H was almost certainly the loudest aircraft ever built, earning the nickname "Thunderscreech" as well as the "Mighty Ear Banger". On the ground "run ups", the prototypes could reportedly be heard 25 miles (40 km) away. Unlike standard propellers that turn at subsonic speeds, the outer 24–30 inches (61–76 cm) of the blades on the XF-84H's propeller traveled faster than the speed of sound even at idle thrust, producing a continuous visible sonic boom that radiated laterally from the propellers for hundreds of yards. The shock wave was actually powerful enough to knock a man down; an unfortunate crew chief who was inside a nearby C-47 was severely incapacitated during a 30-minute ground run. Coupled with the already considerable noise from the subsonic aspect of the propeller and the T40's dual turbine sections, the aircraft was notorious for inducing severe nausea and headaches among ground crews. In one report, a Republic engineer suffered a seizure after close range exposure to the shock waves emanating from a powered-up XF-84H.

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Asymmetric Warfare anti stealth

Having just looked up the XF-84H the first thing that springs to mind is a cruise missile.

The JU87 Stuka had a siren mounted under the engine that gave it its infamous scream - adding a psychological effect to dive bombing.

Imagine a warship launching a cruise missile powered this way. Missiles are normally fired broadside, and the shock waves travel sideways from the direction of flight, which would initially be rocket powered in any case while the wings, props, air intakes and things unfolded, so the crew would be unaffected.

After that this thing would hurtle toward its target at as low an altitude as possible at well over 800kph making the most awful racket, clearly audible to anyone it passed right out to the horizon. It may even damage structures it passed over directly.

Everybody in the target area knows somebody just had a really bad day.

Provided the opponent was unable to shoot this kind of aircraft down it would be an appalling terror weapon, while being as tactically useful as any other remote/self guided precision weapon system.

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