> I had already shown by some pretty simple math that at 2850 
> rmp the tips of
> a 1.65m radius propeller would be supersonic and therefore highly
> improbable, but we now know that the data of hp, gear ratio, 
> rpm etc all tie
> together.
> Thanks
> Vivian Meazza

I have a memory from years back of being told that the reason the Spitfire had such a 
distinctive sound was that the propellor tips _were_ supersonic. Maybe it was just 


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