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Old 10-15-2008, 12:57 PM
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Default RE: CRRC 40cc kit

With the amount of drag on the biplane the 18X8 gave me the best thrust vs speed for the performance I wanted.
I think you will need to try different props, 18X8 or an 18X6-10 or a 20X6 or a 20X8 or an 18X10.
It will all depend on how you want the edge to act.
Props perform differently on different airplanes. It's trail and error until you find the prop and RPM combination that makes the plane fly the way you want it to.
You will also find that there is a slight performance difference between different brands of props of the same pitch and diameter.
For the most thrust (pulling power) you will want higher RPM, large diameter, low pitch such as the 20X6.