Originally Posted by
Tom Nied
Yes, the good news is you don't have a problem. All you have to do is cut away some of the fuselage side to allow enough clearance for the muffler. Do it neatly and give yourself enough room so that the muffler wont effect the fuselage as far as heat. This is a common mod. Use the engine you want. Once I had to find a muffler spacer to make the clearance, but I think you can just cut a nice slot. Same with the needle valve, cut/grind a nice semi circle.
the muffler is where it would be side to side in the plane, it would need to be down about 3/8”. I understand cutting the cheeks for the needle valve and muffler, but I would have to clearance into the fuel tank bay for it to fit without it burning the balsa. Would also have to cut through the firewall for the wider part.