I have been at it all nite looking into engines for this combo... seems the zenoah g-26 from the posts i have read would be too heavy up front. They were saying you would have to do mods to put servos in the rear, and shift everything aft yet still add tail weight to get it to balance! I personally do not know if this is true but it's funny H-9 has it as one of their recommended gassers, so go figure. I wanted to keep this thing lite so as to have it perform well and even 3-d the best it is capable while still running gas, so weight savings up front was crucial! I have even thrown Mike McConoville an e-mail to see if he had any comments or experience w/ the g-26 USL combo. I actually decided to go with the MVVS myself. More power, Less weight! Should be fun!