Crashland, Check out the post 'U Can DO with 120+ engines' by krazyC in flying 3D forums for some good info. They are running RCS 1.4s and the uncompromised MVVS 1.6 out of the Chec Republic. 26cc @2.98 lbs with ign. and battery. Unfortunatly the G23 lacks in the power to weight that they offer. There is one guy that modified a G but required a lot of cutting, turning down the FW and even went as far as dremmeling all unesential matter from the engine block as well as converting the ignition system.

Xup, the engine heat exhaust ramp will come out. The UC mount block is pinned in between the main former and a half former inside. It will come out but must be re-pinned with a recommended larger diameter dowel. I added an extra dowel in the center. While in there add four pieces of tri stock vertically in each corner and one horizontally to the block as there is already one in there. These five small pieces and the new dowels are tremendous in strength compared to the small addition in weight. Within the last three weeks I knocked of my UC twice and the only parts affected were the tee nuts, splitting the threads from the washers. No structural damage. You will find that the tank will lower 5/8" perhaps the desired 3/4" if the curve of the tank ends come into play. Missing from the autopsy photos is the half former from inside that the other part of the block pins to. Joe