This video talks about the later war "Super Prop" fighters that the USAAF was considering near the end of WW2. Some were built, some were not. We also end up in a Sicilian elevator.

I did not cover the USN or British super props, although one makes an appearance.

My video on aircraft Supercharing and Turbocharging:    • Turbo vs Supercharging in WW2 Airplanes  

Adam's video on props vs. jets:    • Aircraft Performance | Piston Engine ...  

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A lot of people are asking about the destruction of Republic's records. I talk about it more in this video just after the 21 min. mark.    • P47 Thunderbolt Pt. 6 Range, Deceit ...   At that time, in 1987 Fairchild wasn't sure what Republic records were still classified and what were not. The Republic F105 had only retired from service three years earlier, and Republic built equipment that was classified. Rather than figure out what was classified and what was safe to release to the public, they just destroyed it all.