Should be able to eek out a tad more rpm with a TD cylinder. Being
a rotary valve it is getting a bit more air in vs reed allowing more fuel
so a plus. Tee Bee tested a Drum Rotary engine with his Scalpel.
Also VGE did one.
http://www.rcuniverse.com/forum/1-2-...49-engine.html
Should make for similar power:
https://www.youtube.com/watch?v=H1Z8Evb5TsM