ORIGINAL: shiver
How would increasing the prop length slow it down? More drag.
Yes... but if you want good advice, don't use a larger prop than that is recommended for your engine... You will burn out your motor. Some people in here failed to tell you that.
I've decreasing the pitch on my props before. It does slow down the plane some and it won't slow down your RPM. Less grab from the prop, slower plane and the engine works a little easier.
