I run a ST 90 on mine. It's a good combo. The YS 1.20 powered ones are a great combo. It dosn't need reinforcing. I would not test fly it on low rate elevator. If it dies the low rate is not enough. It will be in the ground before you know it. The stock landing gear is to flexable to run wheel pants. One hard landing and the pants will be into the wing.

Good luck and enjoy. The Goldberg ULT is one of the best all around flyer out there.

David