I thought about mounting the twin upside down but the exhaust pipes won't clear. I flexed them as much as I dared on this installation. Given what Horizon Hobby charges for replacements I didn't want to press my luck. I have mixed feelings about the needle valves. Yeah, they sure stick up. But on the other hand, they are accessible unlike some of my prior projects with other engines.

I'm hoping that I can scrape up the $$$ to build a "Mark II" with the same hardware, replacing only the fuse and cowl. I think I can clean things up a bit. I learned a lot about working fiberglass with this project. I also discovered I could move the engine about 1/8 inch back and maybe 1/16 down. I think I won't have to relieve the intake manifold area if I make those changes. Also, I want to try to fiberglass the door opening as was suggested here earlier.

As near as I can tell, the only way to have a really clean cowl is to use a OS61. As much as I like that engine, I'm sooo tired of that two stroke sound.