Vans RV-12. Link here!!!! The kit normally is setup for the Rotax 912ULS engine but people are balking at it because it's a $26K engine. Some folks have converted the RV-12 to the Viking and there has been some serious engineering put into it and it's half the cost. If you go to this link.... HERE!!!!!! and go to the 2nd video on the RV-12, there is a play list of 7 videos that show the plane and engine together and flying. I'll see them at Oshkosh in a few days and make an assessment.