RCU Forums - View Single Post - Engine size, Proppeller, RPM
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Old 02-14-2016 | 10:09 AM
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speedracerntrixie
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Ken, not sure how this would be done as far as actual prop sizes as there is such a size range that will work for each engine and different makes of the same size will load the engine differently as well. My rule of thumb is to prop to not exceed the following max RPM on the ground.

53, 63, 70. 12,000

91, 110, 115, 120. 10,000

140, 160, 175, 185. 8,500