I don't really think the YS110 on the 46 UCD is the real issue since you can always throttle back. I think the real mistake is using this plane as a trainer. I think your friend would do better to get a 60-sized trainer, and use his 110 on it with some good servos, then make the UCD-60 his next plane with the 110 & the good servos. Still not the cheapest and safest route, but probably better then going straight to the UCD. Of course he could be a natural born flier, greasing every landing, and start flying 3D right from the get go...wonder what the odds are for that?