Prop/Engine combos for Knife
My knife is still under construction, but I do have an OS46FX swinging a 12.25 x 3.75 on a Magic.
The motor works on that plane. At the minimum pull the baffle out of the muffler. If you can get one, put a Tower Pipe Muffler on the OS46FX. It's a straight bolt on addition. Works Great.