Page 28 MA mag from Al Clark, dont know it thats BigAl or not , but its a cool concept, kind of a airhog bipe only not a bipe twin rear engines 2 channel small enough to build a box and put on the back of his motorcycle, and idea I had of doing for my extra, but his is a lecky and mine aint so I need more box for fuel and battery and ignitor and starter,,,looks like a pretty easy build, but I dont know why he decided to go pusher instead of tractor,,a good read anyway.....Rog