I discovered this about a week ago and this morning I had the chance to verify the prop pattern. A smart car (2008 or newer) with the 3 bolt wheel pattern is the same as a SAE-1 prop pattern. While this isn't a great discovery , having a mostly pre-made prop hub is useful for working on gear reduction, a test stand or build a mount for the corvair. Just line it up drill three more holes and your done. I hopes this helps the group. Thanks David Boyer
