That's pretty basic old school thinking about the power difference between the two and four strokes. There is still some power difference but the four strokes have gotten a lot closer these days to the power of the two strokes, it isn't anything like it used to be with the old fours. The smallest four stroke I have today is the OS .91 and it pulls the same plane every bit as well as my two stroke .91. Isn't as fast but it has about the same power.