A very neat bird! I did a search for the 20-20 episode but could not find it. Thanks for the link, it clearly shows how the engine is mounted upright in the open. this is what I wanted to do with my challenger to get away from the inverted engine issues. what climate did your fly in? I had researched the F33 hirth (spendy) and they do make a pretty slick kit to mount on a challenger. I think this is probably a better way to go since that engine is in use in a pusher.