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Old 10-14-2007, 10:51 PM   #1
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How to measure prop pitch

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I have several old 14-18 inches wooden props with no marks on them. I need to know what their pitch is.
Could somebody show me a practical way to measure the prop pitch?


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Old 10-14-2007, 11:09 PM   #2
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I may be wrong but i do not think that it is a simple process because most props do not have a constant pitch throughout their radius.
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Old 10-15-2007, 07:39 AM   #3
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The pitch of the blade is constant along the blade, or at least it should be. The angle of pitch along the blade is different. Let's see if I can explain why.

A 10" dia prop x 10" pitch. Ignoring the helix it gets too complicated. The tip will travel around 31.416" and forward 10" in one revolution. Halfway along the blade the 5" dia point will travel around 15.708, but will still travel forward 10".

SOOO draw a triangle with a 31.416" base and a 90deg line 10.00" up. Join the two points and measure the angle. That will give you the angle of the blade at the tip. Repeat that process (eg 15.708" base and 10" up) at any selected point along the blade using the point travel as the base. Join the points and you will see a much larger angle. If you look at any prop the angle of the blade at the root is always much steeper than the tip.

You will now need some type of adjustable protractor to measure the angle of the stations along the prop. Or make up a bunch of paper templates form the drawings you made, (Not likely to happen, right?)

Try and find a Pylon Racer who has a pitch gauge. Pitch can be determined in seconds.

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Old 10-15-2007, 09:13 AM   #4
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pitch on props

Surely a quick way would be to get some props that you know the pitch of & view down them to compare with the unknown . Think that would be a less complicated method & good enough for the purpose you need .
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Old 10-15-2007, 09:21 AM   #5
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Although this method is accurate enough for my liking;
- mount a protractor to a square block and measure the defelected angle at .75 of the diameter.

Follow up with a tach, pitch and diameter are not the only factors.

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