Recently I had been researching the Acrolite 2M a high wing tandem seat design from Acrolite: http://www.acrolite.org/. I liked what I read but wanted to know if a VW stoker engine could be substituted for the rather expensive recommended Rotax 912 UL. Mr. Ron Wilson was fantastic! He sent me a letter explaining how to use an included weight an balance Excel chart as well as an explanation regarding the feasibility of the VW power plant question.