Mine turned the Top-flight PP 18-8 at 8200 RPM, a Dyna-thrust 18-8 (plastic) at 8000 RPM, and a Top-flight PP 20- 6/10 at 6200 RPM all on 10% fuel, It seemed to pull about 18+ Lbs. static on the fish scale with any one of these props. Have since gotten a Bambula 18-8 and a Master Airscrew wood Scimitar 18-8 which I will try next time out. Plane weighs 12.5 Lbs. (H9 Edge 540) so it should be alright, now if only the weather would allow.