Engine - .46
Prop - 10 x 8
Comments - I took some 40 size air plane floats that I built, mounted a quarter inch piece of plastic as a base for the .46 size engine with a 10x8 prop, then welded together some 3/16 steel tube stock for the duel rudder support. The boat is extremely light (balsa floats) and really moves, I had some handling problems at first, but after lengthening the rudders from 2 1/4 to 3 inches, this closed the gap between the rudders at full turn and made it handle much better. I'm guessing this boat went between 30 to 35 mph.