Even with a bigger engine the ultra isn't the most suitable plane to learn hovering on. (that isn't to say that it won't do it) it needs more elevator so it is easyer to pull the tail back under the plane after it starts to fall out. I'm in the process of modifying mine by making a new stab/elevator for it that is similar to the one used on the UCD. A couple guys here on RCU have done that and like it.