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Richard Casady

On Sun, 15 Feb 2009 08:30:24 -0500, wrote:

Pitch is the theoretical travel a prop makes in one revolution. It is a
measure of the prop not a dozen measurements of the prop.

That's hilarious... and wrong

It is true that pitch can vary from one point to another. It does with
aircraft, but there is a number for pitch that the props have. Even
so, a prop has a nominal pitch, and I am sure there is a standard way
to measure it. That is what engineering societies are for. I am sure
they measure it once, not many times. There have been some true screw
propellors, actual screw threads, trimmed. And you could screw them
into a giant threaded hole, if you had one. You can measure those
anywhere and get the same number.

Casady