ORIGINAL: jester_s1
I didn't catch that he was in Denver, which of course makes the engines less powerful. The problems with going too big are still there though. I have a .60 size stick that the former owner used a 100 Saito on. He said he couldn't get it to sit still at idle, couldn't land it without cutting the engine, and couldn't get it trimmed to fly right due to the weight and the torque issues. He had several wrecks that he blames on the big engine and wound up giving up on the plane.
None of his problems were the cause of the engine. These are 60 size planes I have built from kits or scratch. The Harley Extra 300 had the OS 1.20 FS but I went back to the YS 1.20, the yellow Extra is also another CG kit with a YS 1.40, the Hots is a midwest kit with a YS 1.10, the Daddy Rabbit is scratch and powered with the SK .91, it also flew with a SK 1.10, the 4*60 is powered with a Saito 100, the blue Extra 260 is running a SK 1.10 but went back to the .91 when I had to return the engine.
The Boeing bipe is scratch and had a OS 1.20 in it for years, I changed it out for a Brisn 40cc gas engine. None of them roll out or have any trouble with landing and all trim perfect. Low idle or tension on the wheels keeps them from rolling out. Building straight keeps the plane from doing odd things in the air that you can't trim out. The Boeing bipe is a giant though with a 68 inch wing, the 1.20 flew it but was really lacking when you wanted to show off and stunt it.