I've test flown several planes with this motor, (LS Pro 26, same motor, http://lsproengines.com/lspro_004.htm ), they run great. I've flown a Seagull SS, a Cermark Pitts, and a 73 inch Yak54 powered with them, power is great, spool up is quick, idles very well, nice Pitts muffler stock. I've flown the Pitts maybe ten flights, great combo I would say a perfect motor plane match. It doesn't have unlimited vertical, but a full size one doesn't either, but it'll haul the little sucker around and go straight up until it's real small then I do an outside snap into a inverted spin, real pucker factor.

The only negative is that they don't have a choke on the carb, so the first start is tough needing a starter, after that for the rest of the day it's one or two flips. I just bought one for myself, I intend to just put a fuel line to the carb opening so I can prime the engine, if you do that it starts with two or three flips on the first engine run of the day. Larry had them on sale for $275 when I bought mine.