ORIGINAL: kid chuckles
I have my first 4-stroke now in a sundowner and have not had the opportunity to fly it yet. A buddy of mine has a couple and he can do stuff my two stokes do not want to do. Like come in for a hover at no throttle and hit the gas and it responds quick.
What your buddy is using , is the torque of the 4 stroke. The horsepower and the torque band on 4 strokes , come in at a much lower rpm . Thus he can run a higher pitch prop and lower rpm`s to hoover, ect with. On 2 strokes the power band is at the upper end of their rpm range and to get the same torque as the 4 stroke , has to run a higher rpm. and is why you cannot run as high of pitch prop.
For flat out speed, get a 2 stroke, for stump pulling get a 4 stroke.