For what it's worth, I have an ASP (Magnum) 61 four stroke on my Kadet Senior. I can take off in just a few feet and climb out at a very steep angle (although I can't go vertical.) I can putter around all day at just a few notches above idle. Take offs at 1/2 throttle with this engine are very scale like ... smooth acceleration, tail comes up, then after a few more feet the plane lifts off and you can climb out at a nice angle. The Kadet is reasonably strong, but is made out of very light construction. I don't think it's designed to be severely overpowered. But half the fun of this hobby is testing out our crazy ideas. :-)

Curt.