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if you fly your P47 with a 3.3m diameter prop instead of a standard 4m, you'll definitely lose more efficiency, perhaps 10%, at 0.7Mach(above Vmax).
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Not at top speed or dive performance.
In general....Smaller disc = higher top speed because a large disc means more tip lose.
Larger disc means better low speed performance, ie take off, climb, cruise, and turn.
Examine the diameter of supersonic propellers.....