ORIGINAL: MarkGrabowski
Thanks for the update, Matt. Taking a look at boring/stroking this motor might yield some extra power there. BTW, what are the bore & stroke dimensions currently? If the crank is a two-piece design with separate crank pin, getting it stroked shouldn't require anything other than a 0.5mm offset crank pin...
The engine is oversquare and IF I remember correctly, it has a 36mm bore and 30 mm stroke. If that's right, then it's a 30.5 cc engine. Two things....the oversquare allows the engine to make its more HP at higher revs. One of the reasons why we saw as much jump in trhust when turning the 18x6 Vess woodie. The rpm jump was about 1000 over stock muffler. Second the relatively short stroke means reduced or damped vibration at all rpm, which is exactly what we saw.
Anyway, I am outfitting a test bed and hope to have it flying weekend b4 TG so if weather holds I can get a few flights on it. I'll post a couple photos soon
Matt