ORIGINAL: garywi I have never bought one before. If I can find a metal geared micro with 60oz of torque at 6v with bearings, with a tiny case, what is the downside? I am looking to use to mount externally on a Sig Kadet. The only thing I can think of, the micro's have only two mounting screws, instead of four and you may ripp the servo out of mount?
Why 60 oz torque on a Kadet unless the model is grossly out of balance? even 33 ounze at 4.8v has been more than adequate for past 25 years.
Micro servos and recent mini servos were designed for the new generations of ultra lightweight park flyers, 1/2A etc and whilst they have the torque, the teeth simply do not have the "shear" factor required and as imposed on the gear train by shock loads of GP models. Smaller servos have lighter circuit boards, pots anmd other components which also suffer under the vibration of GP motors. Rule of thumb is to fit the servo with the thickest possible gear set and largest case practicable for size of model, especially if weight difference is minor. When next near LHS, wander in and examine the packets of gears sets and see how very thin the gears get as the servo gets smaller and remember metal gears wear out and get sloppy much much faster than nylon. A hard landing may flap the control surfaces enough to shear a thin gear tooth with a premature end to next flight - jammed servo gear (gitching / loss of control) often blamed erroneously on TX or RX failure..
Refer
101 - Servo FAQ & picking the right servo for the job and the many articles on my web page relating to servos.
Regards
Alan T.
Alan's Hobby, Model & RC FAQ Web Links