.50 cubic inches is a lot more than .36 or even the 40's that sometimes slip by at The Brodak.  I was toying with the idea of twin 15's but they won't allow an electric starter and I refuse to hand-flip a twin, especially against a time constraint.

 FWIW, I have a Sterling P-38 with two LA.15's. For me it was just a fun fly plane and would be worthless for any type of tight maneuvering, like combat. It now hangs on my shop wall, where it belongs. Imagine swinging a two pound rock around on a 55 foot rope, these are the flight characteristics of this combination, literally. And landing after the engines quit? Barely more than a controlled crash.

Nick Ziroli designed a P-38 for combat. Single engine but dummy spinners on the booms. Plans available thru Barry Baxter or possibly Flying Models. Looks like it would be a good flier. On my future build list.

The large problem with the 36" Sterling P-38 is it builds heavy from the kit for its size.  With wood substitution, it would fly well with Norvel .061, probably.  It is way too small and heavy to actually fly well with the modern .15s.

BIG Bear
RNMM/AMM

             Rick, I certainly feel they would suffice. They're light enough for the thin wing the plane had, and they have ample power. I'm quite sure Tee Dee .09 heads would give more power if needed. The main problem is the plug issue as they're getting harder to locate. I believe the weight is the killer on the modern 15's. They fly the plane but when the power cuts it's a brick. Ken