RE: Sig Kobra engine question.
I am running a TT pro .36 in my Kanke F3d plane and love it. I added an Ultrathrust muffler and am running an 8-8 prop at around 19,000 rom. The TT .36 will be cheaper than the OS but do not know the differance in performance. The TT is also a direct swap for the .25 FX. That should be a great combo.