sean - working hard on a CG Tiger? I don't think it will be that hard at all. Your standard servo will have about 4 kgs, for genaral easy flying even 2.5-3 kgs will suffice. You should see some of the old servos, I got some from the 80's, called MINI Servos ... its about 70% larger than your standard ones and they are so slow but they worked fine on my EZ Laser 200 (40).