A friend at the field has the ultra stick 40 with a 46FX on it, and it won't pull out of a hover. Stability seems ok, but it just doesn't have the power you need. If it's around 5.5-6 pounds a YS .63 will hover it. It's possible to hover pretty much everything provided it has enough power. Wait until you see a 1/3 scale stearman hovering, you'll believe it.

Reid