ORIGINAL: sctcrash
I am using a S3003 on the throttle, and i have 6V battery to get more power out of the 3004 on my rudder. I may just get a high torque for my rudder and go back to a 4.8 battery.
You could use a Hitec HS 81 or 85. They are smaller and lighter than the standard Futabas and work well for a throttle servo. I think the one I have as a throttle servo is the 85...[8D]