Next I made the engine mounting box. For an R/C scale aircraft, this must be made from pretty solid pieces of wood, to prevent the engine from ripping the aircraft apart. I had an “AHA” moment, when I realized the engine can be angled and turned up-side down to get the propeller axle at the top of the aircraft. The aircraft mounting box is slanted back to offset the angle of the engine mounts. I have placed a servo behind the firewall. This should be connected to the engine carburettor to adjust the engine speed.