I am a newbee to heli's. I have a 30 size raptor with an os.32, jr-652 and a csm 540 gyro. Why does it move to the side when I am hovering. I thought that a true heading hold gyro would not let this happen. It moves slow if I use my trim, just one click makes it go the other way. any tips.

Having recently gone thru a similar experience with my Raptor 30 check the following:

Tail rotor control linkage needs to be ultra smooth with no drag - check ball links as some may be too tight. The tail control rod guides may be out of alignment as well. You might need a bit more negative gain programmed into your Gyro thru the radio.
Did you use the CSM supplied mounting tape or something else as sometimes mounting tape can make a huge difference.

steinhofftrio: One other thing with the CSM 540 is the ATV's are set up threw the gyro wich you probobly already know, but the ATV's on channel 4 in the radio will change the linier value that the gyro gives the tail. I started out with moving my ATV's on channel 4 to 65% and this gave me more of a linier movement on the tail, meaning when you move the rudder stick to full left the tail moves to 100% left. When you increase the value on the ATV's this will give you more rudder with less stick, less linier.
I know have my ATV's at 80% because I wanted a more sensetive tail. With your ATV's at 100% on channel 4 you will get 100% tail with about 50% stick travel, this may have in combo with some points that shemphoward has may be the problem.

I'm thinking that one click on the trim tab is sending the tail in the other direction because your trim is less linier if you have your ATV's at 100% in the radio, so one click may be giving you too much trim. Mine was like this untill the tail got broke in and wasn't so tight.

Hope this hepls.

Heli on,
Shannon

Don't the CSM gyros also require a specific start up method? Like having it in heading hold as you turn on the heli, and keeping the heli still, (straight) as the gyro sets itself.

I haven't flown a CSM for a while but remember that you have to use some caution with the start up procedure as with the newer futaba and jr hh gyros.

That would give you the exact heli response as what you are saying. heli rotates slowly to one direction..(due to gyro not centered) then with 1 click trim input, (you now are telling the gyro to go the other direction all the time (not ITS netural position)) That would cause it to slowly, and continually turn the other direction.

Might be a simple solution, but I'll bet you a buck!

Jeff

Hitch-Hicker: The CSM 540 doesn't need to be HH, it just needs to self initialize for a few seconds befor you move it or the rudder stick, my servo is always trying to find center so it chatters and after powering up the gyro I know it is done initializing when I hear the servo start to chatter.

Also you make a good point with the gyro not being centered, I can recall the 540 being kind of a bear when I set it up the first time. I wasn't used to the set up functions and I can see how easy it would be not to get it centered properly.

You kinda have to read the instuctions about three times and try the set up on the gyro befor it makes sence on the first run.

Heli on,
Shannon