This airplane was built for the A-65. It is a Sonerai but the builder wanted to use a GA style engine for the reasons you state. It has a cruise speed of 120 mph. I have had her in a dive or nose pointed down at 160 mph ground speed. Indicated at 149 mph. She has a payload of 500 lbs. This is with a 200 lbs pilot. Hold 14 gallons of fuel with 7 usable without a fuel pump. She has no electric system. This is a two seat Sonerai IILSS. IILSS mean Two seat Low wing stretch with S modes " IILSS". Tony P.S. If you would like to purchase this airplane PM me, I might be willing to sell it.