ZDZ 80 RV. An 80 ccm, 8,2 HP gas engine. I have tried to calculate a moki radial, but it wont go under cowl. So it's a one cyl. engine, but it does a very good job. The exhaust was a tricky business, but at end, it came uot very well. Oh there is also a smoke system installed and flight comp. DPSI-TWIN. There IS a plenty of space to fill on board the WACO.