Has anyone out there put one of the 4 stroke Rotax 912 (100-115HP) engines on an experimental J3 or PA-11? I am considering building an ultra light experimental J3 or PA-11 and was wondering what different engine alternatives were available in addition to the C-90 or 0-200. According to the Rotax literature, the 912 non-turbo install weight is approximately 140 lbs which is close to the weight of a C-65, I think. What other engines are out there that would be good for a J3/PA-11? Just trying to figure out my next experimental project.