Speaking of the F8F version of Bearcat....ESM makes a very nice F8F Bearcat if you are in the market for a bearcat. It is a bit larger I think than the Thunder Tiger. I have not looked at specs, but my friend flies the ESM plane with a twin DLE 40 or some other brand of gas twin 40cc. He has a newer version of Sierra Retracts in it that are stronger than the first version he said. Other than that, I have only built and flown a 1/12th scale F8F in the past that was a hand launch and flew great with an old OS .26 surpass 4 stroke. Great fun!