I have a pair of brand new Hitec 55's. I also have a tool called TXSERVO which is a little gizmo that you plug into a USB Port and can plug up to two servos into and then you can 'exercise' these servos. It comes with software that has a very simple movement program and a 'grid' that you can select movement and 'play' the movment back into the servos. Neat gadget.

Aaaanyway, I use it to zero servos, to make sure the gears are not stripped (I have one that is, and it sort of.. stutters.. for lack of a better term) and to check the maximum throw. I'm sure there are other applications, but those are the main ones I use.

I was just 'playing' with the servos with TXSERVO. As I said, I can plug two servos into this gadget, so I did. And, as I said, I have a pair of new HS-55's, and I plugged one in 'channel 1', and one in 'channel 2'. Then, when I used the grid to move both servos through their range of movement, I found that one was slower than the other.

I swapped the TXSERVO channels thinking that if it was a computer or a TXSERVO problem, then the other servo would be slower, but the same servo was slower, meaning that 'servo 2' was slower than 'servo 1'. If used on ailerons, for instance, one aileron would be slower to respond than the other, the difference was around 1 second, which could be considerable, if used on ailerons or any other application that uses two servos (ailerons or elevators, flaps, whatever).

I guess this is not a question, but an observation. Perhaps someone out there has a comment to offer about this. The only other solution I can think of is to use different manufactuer servos, or play with new servos until I find a pair that match, or not to worry about it at all.

What do you guys think?

CGr