Yeah its a BLS 172 they are 513 oz at 7.4 volts, Its a big jet and the rudder is beefy.... I normally only use these on my stabs but this being a 3D jet figured why not, futaba doesnt have a nice good 350-400oz Sbus servo.
The jet is right 50lbs wet so using something in the 300oz range didnt seem right.
I was more worried about ripping the control horns out of the control surface not stripping gears.....thats a costly servo to loose.