lasuen,
I had the world models 1/5 cub. Powered it with the same os.91fs that I'm going to use in the busa 1/4 cub. Rediculously over powered. I got a real good deal on that cub and loved flying it. Second best arf I ever bought (first is the rascal 110). Its a good quality arf (as far as arfs can go). You cant go wrong with that one. It flew comfortably at 1/4 throttle. I prefer to fly scale and let it hang in the wind. No bad habits on the ground or in the air. It was lost due to battery failure, should have used a new one, oh well. Ever since then I've been wanting another cub so I'm building the next one. I'm using 4-strokes because I like the sound of the soft putt-putt as a cub flys by.
Edwin