The Altitude and Radius spinners in Tower don't allow fast spinning. For instance, if you're at 100ft and try to spin it down to 30ft, you can try to spin it down fast but it will keep bouncing back to the higher number, only dropping by a few feet per spin despite the speed of the spin.
It looks like it's sending a small change to the copter, waiting for a ACK, and then displaying that before listening to the next change. As a result, you have to spin constantly, fighting against this "stickyness" to get it to move at all.
The Altitude and Radius spinners in Tower don't allow fast spinning. For instance, if you're at 100ft and try to spin it down to 30ft, you can try to spin it down fast but it will keep bouncing back to the higher number, only dropping by a few feet per spin despite the speed of the spin.
It looks like it's sending a small change to the copter, waiting for a ACK, and then displaying that before listening to the next change. As a result, you have to spin constantly, fighting against this "stickyness" to get it to move at all.