I think i found something. This is the Goteck 9757MG

http://www.ebay.ca/itm/Goteck9257MG-Metal-Gear-RC-Servo-for-Align-Trex-450-500-Helicopter-Plane-HH-/111777588604?hash=item1a0676a57c:g:uP0AAOSwKIpV~7MC

This one will cost half the price of the trackstar and with good spec. Better torque and good speed. The Trackstar has Titanium gear vs unknow metal gears but still i dont think that will be a problem for this project. The Dimension: 35.5mm x 15.0 x 28.6mm. 

Trackstar 30$

Goteck 17$

I think i have a winner there. Since this project is kind of a try out thing i dont want to spend more than necessary.

Edited 1 time by Silok Oct 21 15 2:14 PM.