"DAN" wrote in message ... .

Yes, what-if by the French enthusiast Stéphane Beaumort:
http://bispro.deviantart.com/art/Nor...hell-406226038

The Allison T40 was plagued with problems, including oil leaks, runaway
props, and disintegrating gearboxes. Many promising aircraft designs were
doomed from the start because of down time caused by engine malfunction,
allowing competitors to get a leg up.

https://www.flightglobal.com/pdfarch...0-%202045.html

Had these been grafted to a B-25 airframe the performance would've been
spectacular, especially rate of climb. With three times the horsepower of
the original Wright R-2600s, it probably could have reached 480 mph, that
is, if it didn't fly apart (150 mph faster than its never-exceed speed).