I think this is the servo to use for a lot of large jets
out there. I use it on DC10 elev and Rig turbine
rotation.

http://www.multiplexrc.com/servo_digi.htm#daten2


Multiplex Jumbo BB Digi
On 6 volts... 255 oz torque...460 holding power... ~ $130

They are very tight and quite large but the gear train
is far large and can take much more abuse than standard
size servos.

Eddie Weeks