Originally posted by tiggerinva
The engine weight is also a factor. OS states that a .46LA weighs 9.6oz whereas the 65LA weighs 18.87oz ( I know yours is TT, just a comparison..).
And the TT46 Pro weighs about 18oz... not to mention the fact that it doesn't have to be tail heavy. There are ways of balancing that don't necessarily include adding weight.
Comparing a Cub to a heavy plywood ARF trainer isn't really fair. I've got a Zephyr which has a 62" wing and that only has a .15 in it. But it's a very lightweight structure.
It's a valid comparison, as it illustrates the point very well. His TT46 Pro will swing a 12x4 at 13,000 or so RPM. That's plenty of thrust to fly that airplane. It won't go straight up, but it will
fly rather nicely.
I don't know about the rest of you, but when I fly a trainer I don't bore around at full throttle. I'm usually down below 1/2, and that's plenty to pull it around without worry. Putting a 90-size on that 60-size trainer will only increase the wing loading, stress the structure, and won't serve the purpose of practicing landings nearly as well. A good quality, ball-bearing 46 like he has will do just fine. We're not talking about a huge trainer; we're talking about a 69.5" wingspan, with a flat bottom wing.