I had a H9 33% extra (older version) with the 5.8, it weighed about 26lbs, and the 5.8 pulled it with authority. It vibrates a bit, but so do any of the other big singles. Its a good motor and makes good power. I ran a menz 26x10 and a mejzlik 26x10 on mine. You should be fine, just try to keep the plane as light as possible. The motor has a tad bit more power than a zdz 80 (couple hundred rpm). I think J&A makes a pitts muffler for it.