Thank you for all the info. I will get a 20x8 prop. As for flipping the prop I will be using a rolling chicken stick. or something like that. I am minus half of my pinky finger from getting my hand in the prop. Cut it clean off. As for apc props. We all use them on our nitro planes. And sand the edges before using them. The props can be low to the ground. Wood props do not break. But they chip from the grass. But I have hit the ground with the apc prop on my nitro planes and cracked the firewall. Nose over after landing.