twice when I was hovering my heli turn around 180 degree. It was windy outside, but I flew in worst condition than this and this never happen. The heli was sitting for two weeks because of the bad weather. couple of weeks ago I switch my s148 with hitec digital 5625. I have the avcs switch off on my gy240. I don't know if its the servo, the combination, or the way I have the adjustment on the gy240. when I was using my s148 the only problem I had was the servo will become sloppy very fast. the heli spin to the left. Also the heli I notice the tail was wagging alot especially in fast forward flight.

The gain on the gyro is too high if the tail hunt's or wag's in fast forward flight. Tim.

turn the hh on

tomorrow when I test it again I will turn the gain down.
I want to wait until I am comfortable with the heli before I turn on the avcs, considering that when the avcs is on the rudder servo stay in the last position it was commanded to

Am I missing something here ? Your servo should always go back to center in normal or heading hold.

You are missing something, most servos/gyro do not return to the centre in HH mode unless centre is the correct position to hold that heading...

If they travel to the end, they may back off a smidge, but once they sense the heli is not rotating the gyro will stop the servo where it is...

Ya! That sounds right. I guess I never thought about that before. That shows you how observant I am .

hmm..I have the same gyro with a s148 and no problems so far, though I can understand why you would want to get more familiar with the heli why turn off the avcs? doesn't that give you far better performance especially when going in foward flight?

I was using the s148 on the tail for over a year with the avcs off. A month ago I put in the hitec 5625 digital, but the weather have been bad for a month now and I haven't got to fly as much as I wanted to with the hitec in the normal mode on the gyro

You need to put the gyro in the avcs mode. This is the heading hold mode. The reason the servo does not center in the mode is because the gyro is trying to find the hold spot( the spot where you positioned the rudder) You cannot look at it while it is sitting on the table. It will never center in this mode while sitting stationary because the heli never moved(see instructions). When flying it just holds the rudder where you last put. Don't be afraid! Avcs is made for beginners! I have one in my raptor. On a very windy days the tail will still sit rock solid. You will find that flying will be much easier.