Here is a simple mathematical
equation to determine how fast your plane can go.
This is strictly based on the prop RPM and the pitch
of the prop. To account for the drag of the airframe
multiply by somewhere between .85 to .95. Play with
the drag factor to see how clean your airframe is.
RPM * Pitch / 1056 = miles per hour
Example: for the Zodiac
601 with the continental 0-200 engine and 58 pitch
prop
(2500 x 58)
/ 1056 = 137.3 mph x .90
= 123.3 mph
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