I am 98% sure it will take a "standard size" servo; example: http://www3.towerhobbies.com/cgi-bin...&I=LXZV41&P=ML What I can't tell you is if will need to be a digital one and/or what input plug it will require to the receiver. Stuff tends to be pretty standardized around the Futaba I linked to but with the off-brand RTR's, I can't say for sure.