Just want to know the speed limit for the THS trim wheel. Since the max trim rate is 2 deg/s when 2 systems are operating. from the position ratio of 1/2.13, the max wheel speed is only 0.93 deg/s. Is this correct?

Thanks for trying to answer my question! I'm asking the max wheel speed, not the trim rate. I did the calculation from the info I have and it just seems pretty slow, so I would like to as anyone can confirm it.

The word paranoid was response to the post of 1234, nothing to do with the question itself. He was so troubled by the fact that I'm asking such a question

BTW, it a nice picture, which I happened to look at it too yesterday. That page is a pretty good introduction for basic facts of A320 EFCS.

Thanks for both of you guys! However, the number in your post is pretty much halve the ratio (0.97) of (pitch angle / wheel turn) comparing with my calculation (2.13). So it is A320 we are talking about, is it?

there is a test that the ths resets to 0 from full up and full down position. it definetly turns faster than 0.93deg/sec. what the exact value is though.. no idea

There is no speed limit, you can turn it as fast as you want. the speed the stab moves is controlled by the hyd motors that turn the screw jack. I suppose that if you can spin the wheel fast, you can keep up with the motors, but i haven't ever tried.