patriot vs f-20 vs kouger
I hate to burst your bubble here but i have the F20. The 46fx is a great runnning engine, I have one in another plane BUT if your looking for speed out of any of the 3 you described, your not going to get it with a 46fx in those planes. Jett 50 will give you what your looking for.
*Another alternative is a .40 size Lanier Shrike. I have one with a TT46pro and Ultrathrust muffler. around 120mph. Not bad for a basic 46 engine or consider a Diamond Dust. 46 engine will pull the snot out of a 3lb plane.