I just bought a used 72" QQ Yak with engine and all servos except for the rudder. The specs call for a servo with a minimum of 130 ounce-inch of servo torque. I found [link=http://www.troybuiltmodels.com/items/HD-DS120MHV.html]these[/link] for a good price and wondered if anyone has experience with them. Their specs are:

Operating Speed: 0.13/0.11 sec/60°
Stall Torque: 164oz-in. at 4.8v, 178oz-in. at 6.0v, 214oz-in. at 7.2v
Dimensions: 40.7x20.5x39.5 mm
Weight: 56.0 (g)
Operating Voltage: 4.8v/6.0v/7.2v

I DO want to save some money but DON'T want to take any chances with the plane. The seller says they're fine.

Any advice would be appreciated.