Prop and Gear Reduction Calculator

[Mike Kimball]

I just uploaded a spreadsheet to the "Software" section that may be helpful
in particular to those of you planning to use an engine that requires a gear
reduction. I have recently discovered that my decision to use a 2.11 to 1
ratio was a bad idea. Based on the max engine RPM I desire I should have
used a lower ratio. I am now faced with trying to modify my gear box or
look at other options. Even for those not using a gear reduction you might
find it useful if you are wondering what diameter prop to use. If you know
your max engine RPM enter that and just enter one (1) for the reduction
ratio and play with the prop diameter to find your optimum prop diameter.
Don't forget to take into account ground clearance. I think the FAA
mandated minimum clearance in a level attitude on the ground is 7 inches.

Mike
044SR




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