Is there a difference between air and surface servos?

[JERRY2KONE]

Not sure what your references are Harold, but that is pretty much what I was thinking as well. i mean really, what could they possibly do to one servo from another that would make it propriatary to only one R/C field and not another? Metal gears are metal gears, right? Seems to me that all of the specs depend on what you plan to use it for, and how much you are willing to pay for it.

The only other question still looming is why would a servo have a spec that says nmh batteries only? I don't really see what difference it would make where the stored energy comes from as long as the voltage is within the specs of the servo requirements, right? After all we are not talking about rocket science here. The only real issue is whether you purchase the right size servo for your application, and also that you get a servo strong enough to hold up to your pounding on it. Case solved Professor Paralyzed.