This is kind of hard to explain. The back theside with the slotyou are doing the sharpining. I know you said all you do is sand the front. Do you do any sharpining of the front edges that come down to the hub. Or do you just leave them thick. Hoppe this makes sense. I have a lot of experiance building planes over 20 years but boats not much. Whats the difference between theprops with the rounded tips and the pointed ones. Also how do you tell if an engine needs more prop or less?
Dave