That was the APC 16X4W, I believe. The other one I ran was the Xoar 18X6. I really prefered the APC. It brought the engine up to just about 9k RPM's, so I had a really nice throttle range.

The oil is Klotz SuperTechniplate from Tower Hobbies at about a 40:1 ratio.

This was after a few gallons through the engine, so it was nice and broken-in. The biggest mistake I'm finding that people that move to gasoline engines are making is running the engine rich during break-in or expecting the engine to be broken-in after a few tanks like in most glow engines.

The gassers really pick up a lot of power after they're thoroughly broken-in.

I didn't do anything to keep weight down except move the battery pack aft instead of adding weight to the tail.

-Pat