Propeller Pitch gauge calibration

[Peter Pennisi]

Hi Guys,

 

I have modified a propeller pitch gauge to accommodate larger propellers.
The gauge I have is a very old prop shop model.

 

I have decided to check my APC props because I was getting mixed performance
results between all my prop sizes.

 

Anyway I thought I would check my gauge with a new prop to see how accurate
it was and the numbers I got were different to what was on the prop. I tried
another new prop of exactly the same size I got a different result again.
Anyway I am shocked to find that what is displayed on the prop is different
to my measurements.

 

What part of the prop should I be measuring my pitch as this varies slightly
over the length of the blade?

 

Secondly, how would I go about calibrating my unit because I can't do it
with new props because there all different.

 

How do I express for example 13 inches of pitch as degrees?

 

 

Thanks

 

 

Peter 

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