ORIGINAL: Cyberwolf
This as usual has got way off the trail ,but it does make for some interesting reading .Now i'm told that a 2 stroke engine has more torque than a 4 stroke .I'm sorry but I dont buy that for a sec .If that was the case they would be able to swing as big or bigger props than the 4's can in the same size of engine and turn the same RPM's .
In smaller engines, size-for-size, a 2-stroke will outswing a 4-stroke. For example, a 2-stroke 46 will easily out swing a 4-stroke 46.
When the sizes more-or-less reach ~ 1 cu in, the 4-strokes are about on par, & as the sizes get larger, they begin to have an advantage.
2-strokes are not generally used like that, & don't make their peak power when over-propped, but they can certainly do it if appropriate attention is paid to cooling, lubrication & mixture.
I have a TT 42 GP on a 1/7 scale Bucker Jungmeister, swinging a 12-5 APC @ 11,100 RPM. It's only making ~ 0.6 HP when used that way, but it is right in there with any 40 4-stroke that I am familiar with & it's not even a high-output 2-stroke. A TT 40 Pro will turn the same prop at ~12,700 RPM -- show me a 40 4-stroke that can match that.