NEED HELP, Strange Kick In Flight

[Way2evl]

So to start from the complete beginning I just recently started to hear my tail control rod make a high pitch rattling noise in flight. It isn't consistent and I can only hear it sometimes. People have told me they hear it in hard collective inputs.

Now the tail kick I am having I can simulate most times when I am doing a tail in inverted circuit. It will pitch almost a complete 180 (about 160*). I have also simulated it on a loop and once again on a full collective pull out.

I have no idea where the problem is leading from. Tail, FBL Unit, Blades, etc....It is not consistent and it will also happen when the wind is blowing hard into the heli. Maybe a reason I can simulate in hard collective maneuvers. Any help is greatly appreciated.

[duchoaaz]

if it is a belt driven tail, I would look into static. Else you may have binding somewhere.

[Way2evl]

Originally Posted by duchoaaz

if it is a belt driven tail, I would look into static. Else you may have binding somewhere.

Thanks, It's a TT.

[fvdriver]

Check that your servo setup in the Bx are correct. I had an intermittent tail jerk that was because I had the wrong number entered for the center pulse.

[Way2evl]

Originally Posted by fvdriver

Check that your servo setup in the Bx are correct. I had an intermittent tail jerk that was because I had the wrong number entered for the center pulse.

I did change one thing recently and that was the swash plate servo frequency. I changed it from 165hz to 200hz. That shouldn't cause the problem though should it?

[Way2evl]

Any suggestion is greatly appreciated.

The tail is smooth. Anywhere else I should check for binding?
The only thing I've changed in the BX is the swash servo frequency. It is at 200Hz now.

[ddj74]

Make sure the tail servo frequency is set to 560Hz and pulse length to 760μs

Those are the specs for your tail servo.

[fvdriver]

Having the servo pulse set incorrectly was what caused my problem.

[Way2evl]

I think I may have figured out the problem. When setting up the beastx I didn't set my end points as far possible as they would go. Everytime I went really close to the edge the didn't hold in memory so I brought them out some. A buddy of mine told me that they were too far and I had to be losing quite a bit of tail compensation by not having them at the limits. So he helped me to get the beast to learn them much closer. I flew it today and although very nervous it seemed to hold pretty well.

On another note, I think I may almost be outflying the KBDD blades. I don't want to think I could possibly do that, but I might be able to. Definitely going to try some edge or CY carbon tail blades.