The one in my avitar is powered with a Saito 1.50, which works well. I covered mine with Coverite 21st Century fabric, which I really liked. There was a club member years ago that had one powered with a US engines 41cc. His flew nicely with the big heavy gasser, but the muffler hung out the side of the cowl quite a bit. There is really no need for flaps on this plane, as it lands nicely without.