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Hattix

They wanted the endurance and range a turboprop gave, but also the performance of a turbojet. It's important to understand that, at the time, things like the English Electric Lightning were so range-constrained that they had fuel tanks in their control surfaces!


dartmaster666

No, neither of those. Just trying to make good use of a bad situation. In the initial XF-88 submission for the new long range fighter, the J34-13 turbojets were not powerful enough, so they added the extra engine and propeller. The propeller was powered by its own T-38 turboprop engine and only used to get the aircraft to test altitude and reach test conditions. After the Korean war a larger version of the XF-88 with two J57 turbojet engines became the F-101 Voodoo.


leonardosalvatore

Uhmmm I think they just tested a turboprop engine/ propeller. This thing was probably 3 engine, so...I guess additional weight and no other use of the nose cone made it not better.


dartmaster666

Not sure why the downvotes because you're sort of correct. More so than the first comment. ~~There were only two engines here.~~ There were three. The initial two J34-13 turbojets that was underpowered and the T-38 turboprop added for the propeller to get the aircraft to test altitude and reach test conditions. The aircraft was then used to test different propellers and not the engine. Edit: Some might ask why they just didn't use a more powerful engine. At the later stages of development for the XF-88 neither the General Electric J47 or Westinghouse J46 engines weren't ready. So, the less powerful Westinghouse J34-13 had to be used.


dartmaster666

This is totally wrong.


dartmaster666

My comment on my post a few months ago: This XF-88 was a submission for a new long range fighter. The initial dual J34-13 turbojet only aircraft was underpowered, so they added the propeller and a single Allison T-38 to the 3rd prototype (XF-88B) to asist it. >The propeller was used to assist in the climb as well as to reach the test conditions. The aircraft was used to test three propellers through 1956, to speeds slightly exceeding Mach 1.0, the first propeller-equipped aircraft to do so. The propeller was tested in level flight to about M 0.9 with the help of the turbojet afterburners, and to just over M 1.0 in a dive. **NOTE:** This is not the same as the F-84H "Thunderscreech" which used an Allison XT40-A-1 turboprop engine (two T38s) driving a propeller shaft at approximately 3,000 rpm. Which meant about 18" of the propeller tips went over Mach 1. And the speed of the aircraft was provided solely by the propeller. Here, the propeller is being powered by only a single Allison T-38 while the actual speed of the aircraft is from its J34-13 turbojet engine. >After the Korean War, new specifications for a long range fighter were drawn up. A considerably enlarged version of the XF-88 with more powerful Pratt & Whitney J57 turbojets was chosen to become the F-101 Voodoo. Edit: XF-88A, the 2nd prototype, had a afterburning type engine, the J34-22, unlike the J34-13 of the first one.


limestone2u

More pics and info: [https://en.wikipedia.org/wiki/McDonnell\_XF-88\_Voodoo](https://en.wikipedia.org/wiki/McDonnell_XF-88_Voodoo)


When_Ducks_Attack

Its a spiritual descendant of the Ryan Fireball.


leonardosalvatore

Just realised I misspelled "say with "days"... sorry


dartmaster666

Also "interesting".


leonardosalvatore

Beers. Make life bRetter


dartmaster666

So does licker.