Patrick does say minis are ok for the aileron, but I have seen many posts regarding 225's stripping out. I'm going with Futaba 9602's on the ailerons of my second ultimate. The first had standard size servos on the ailerons. The ailerons are very large and I think flutter is/could be a problem. In any case, I would at least go with metal geared 225's and seal the gaps. The amount of torque necessary is not large with one each on the ailerons.