I have Tom Morris Old Time Stunt drawings, and on the Moitle plan it shows a 12"X12" prop for the Cyke. Seems a little extreme to me, but hey, you never know. I have been running a 12"X8" on my Boxcar Chief, and it works really well. A 12"-6" worked OK, but the 12"-8" pulls much better. May have to try a 12-12 just to see how it works. Spitfires and Orwicks work well with 13-6 wood props or 12-6 APC's. I have one great running Cyke, I might have to think about the Moitle. You might have to modify the firewall to mount the ignition goodies through the front. Unless you mount them permanently in the fuse. I am sure it would fly better on a light weight glo, but where would be the fun of that?