I know of two expert level flyers that had tried 4-stroke power for stunt, but noticed they went back to 2-stroke.
When I asked why they both said the vibration level was "shaking their planes apart".
Do you build more beef into a plane that will use a 4-stroke. Also interested in general comments about vibration levels of 4-stroke versus 2-stroke.
In R/C Pattern, the vibration is mitigated with "Hyde" type motor mounts.
The larger the piston mass, the more vibration whether its 2 or 4 stroke. Obviously, the vibration level is higher for a 4S vs a 2S of the same displacement.
The main advantage with a 4S in Pattern was the constant speed character of these motors. The downlines are controllable as the motor acts like a brake. A 2S accelerates on the downlines and the electric motors require a brake function to prevent speeding up as the plane dives.
I flew a Saito 56 in my Pathfinder for my first contest. I could have used my LA 46, but the 4S gives me more time to see the plane and think about my next input. Its more than a matter of timing, its adjusting the transmitter inputs to accommodate the position of the plane. My saito is set up to run about the same lap times, but it comes down at a constant speed which, as a beginner, I appreciate.
Mike