Prop Pitch Question
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Join Date: Apr 2000
Location: 500' above Ireland
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Prop Pitch Question
I have a Rotax 582 with a 2.62:1 C type gearbox. I need to know the correct pitch for a 68" GSC 3 blade prop. It will be fitted to a Kitfox.
Many thanks,
737
Many thanks,
737
Join Date: Aug 2000
Location: S Warwickshire
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Not an easy question to answer. Often it is best to take the propeller manufacturers recommendation or use the experience of someone else.
The nominal pitch is easy to calculate:
Pitch(inches) = (TAS(MPH)*63360)/(60*RPM)
where TAS is the cruise speed and RPM is the propeller RPM.
This then has to be increased by 5-10% for the 'slip factor'.
Of course the relationship between cruise speed and RPM will vary with propeller pitch.
The nominal pitch is easy to calculate:
Pitch(inches) = (TAS(MPH)*63360)/(60*RPM)
where TAS is the cruise speed and RPM is the propeller RPM.
This then has to be increased by 5-10% for the 'slip factor'.
Of course the relationship between cruise speed and RPM will vary with propeller pitch.
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