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What prop is on it presently? Probably the cheapest option for a prop to try is WARP. Very tough prop and it lets you adjust the pitch for performance in take off climb or cruise. WARP will know what works on that motor / aircraft combo. Check with Zenith, they have 3 - 4 CH300 parked (abandonned) outside the Zenair, Midland shop. They were used as part of the type certification for the factory built CH300 sold in Europe.