Plumber, did you keep the nose portion of your patriot with the .60 size engine, or have to cut off all up to the firewall? My friends moves along, but he put an old K&B on it, that never did run right. I bet yours with the YS hauls. Sure wish they still made YS two cycles, great engines as are the four strokes. I sure hope you pick the patriot and .91, I would LOVE to hear about the speed you would get, that is insane! Over-all what engine gave you the most speed on your current and aging patriot? F-4 would be cool, what about the DF .91 on the F-4?? Or a larger engine for the F-4, like an O.S. 1.40, 1.20, or nice webra speed in that size? I think the F-4 would cook with the DF.91., but I'd put my money on the Patriot. Have fun either way, I'll be watching that thread. gotta luv prop jets!
Peace