Bill, Thanks for the reply. I put together a pusher/puller SPAD using .28 Magnums and 9X6 APC props. The same engines and props I had on a tail dragger SPAD with engines in parallel. In the pusher puller I could barely get off the ground. It was so marginal that I doubt if it would get in the air without a headwind. Each plane was about 6 to 6.5 pounds. The P/P is tric gear and the other was a taildragger. I finally put a 9X5 APC prop on the front and all is just fine now. The P/P is a way, way stand-off scale of a Cessna Skymaster. However, since I started in twins with the GP P-38, I feel like naming it my PP-38. A photo of the earlier twin is in an earlier post under twin spad.