I know this has been brought up before but I have been trying to compare apples to apples on some of these alternative engines. I am looking at either the Valley Engineering VW redrive or the Great Plains. They claim to be at 180 to 185lbs with the drive. 450 lbs of thrust with an 84 inch prop. Allot more affordable than the Rotax 912. Thought maybe some of you might be interested in this chart. I took it off of the "fly geo yahoo group".