Sideways mounted Wing Engines

Upright engines were obsolete in and around 1961. There's advantages to having a upright engine in some cases. However, it was susceptible to breaking the beams right out of the plane in a inverted landing. For this reason, Sterling made the T-Square with a bolt on plate which had the maple mounts glued to it for easy replacement. You don't want a muffler on your engine unless you want to break the crankcase snapping the jug right off. It will also break your muffler. I will mention this and probably no one will believe it but I have bent 3 Enya .35 crankcases in my time and all of the over grass. I can't see the .15 being any different as it's design is essentially identical. I have completely obliterated Fox .35's but never on grass. One exception was a straight in impact which broke the exhaust stack due to muffler being on the engine.

      The other downside is the loss of power your going to have using it. Even opening up the stinger on the muffler, it's going to run hot. This isn't a r/c plane, there's lots of drag with the lines and the plane.

         There's no gliding a plane in with crap hanging off the bottom. If you even use a tank with  it's overflow hanging out the bottom, your going to break the pipes right out of the tank. If they don't break initially, they will get caked with dirt. We sometimes use tongue mufflers that we make which are real short but they're still loud and we have a wire loop skid on the nose block. This would be your only real alternative as it will protect your engine but that muffler will also seriously alter the plane's maneuverability.