I've been running the .46 on my Tower Kaos and have recently had to do a rebuild. I bought an old Fox .50 a couple of years ago that appears to be in good shape. I've only ran it on the test stand (ran fine) so I'm curious if any of you have used one before. Could I expect better performance out of the Fox than the Thunder Tiger? The TT is not quite strong enough to pull the plane over the top of a big loop, so an extra 5% horsepower would make it just about perfect.