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I'm using 0.058 inch rubber right now. But it could definitely be thinner because my plane is lifting high and using all of the winds. What rubber width are you using???

Wow ok. I usually use .084" rubber.

I recommend thin rubber under.065" I use .058" rubber which seems good to me. If you find that it is too powerful or not powerful enough it might have to do with your weighting, angle of attack, or propeller pitch.