Tail Wag

[piper]

I finished installing a new Logitech 3100 to go with the Spartan. the Futaba 3154 was getting too hot. Now I have a tail wag. If I lower the gyro gain, say to 35 or so the wag gets slower, if I raise the to 75 or so it get faster. I have a good bit of slack in the control linkage to the tail pitch slider. I am wondering if this is the cause of the wag.
Unrelated to this the ground came up and hit my blades both main and tail and now I have a fast vibration in the tail. I have replaced all blades and main grip screws. The main shaft was not bend, no gears were striped and the feathering shaft was not bend. I don't believe that the tail shaft was bent but maybe is was and I just can't see it. This would definitely cause the vibration.
Have any of you had this wag problem? If so, what did you do to remedy it?

[Buzzkill]

I'll take a stab at it. Sounds to me like the gryo wires are too close to the ESC and/or ESC wires. I mount my ESC's on the outside of the frame at the back to minimize "noise". I had that problem on my (now sold) T500.

If that's not it, maybe it's the servo speed setting on the 760. Angelos from Spartan RC had this to say in another thread: Set the ds760 to 760uSec/333Hz

-Angelos

Then I'd try the mechanical aspect. Slack is not a good thing. Make sure the links to the tail are free and smooth with no slack.

There's a lot of things that can cause this, I'd start with the above and see if that fixes it. If it doesn't let us know.

[J-Heli]

I had that problem on my (now sold) T500.

You sold your T-Rex 500? How come?

[Buzzkill]

Needed the money.

[J-Heli]

Needed the money.

Oh. Sorry about that. Hope everything is okay.

[Splix]

Make sure you're pulse rate on you're gyro matches they tail servo's requirements.

[stoatnchips]

Try as Buzz suggests on the Spartan for the wag issue. As far as the vibration goes, i'd change the tail output shaft first, i've bent up a couple on my 200SE and had associated vibes... check the tail blades are tracking perfectly. The other thing to check for is there is no damage at all on the mixer/SeeSaw arms and the main Blade grips, especially the bearings... they may have been tweaked very slightly.


You sold your T-Rex 500? How come?

... to buy more 200s of course!!

(...Rotorhead58d... place your team on stand-by, we may have another one that requires 'reeducation'.)

[rotorhead58d]

Try as Buzz suggests on the Spartan for the wag issue. As far as the vibration goes, i'd change the tail output shaft first, i've bent up a couple on my 200SE and had associated vibes... check the tail blades are tracking perfectly. The other thing to check for is there is no damage at all on the mixer/SeeSaw arms and the main Blade grips, especially the bearings... they may have been tweaked very slightly.




... to buy more 200s of course!!

(...Rotorhead58d... place your team on stand-by, we may have another one that requires 'reeducation'.)

THIS IS ROTORHEAD58D STANDING BY TO RE EDUCATE.:whip

[piper]

Spartan is set up right for the 3100 servo and it works as it should and the limits are setting as they should. I have replaced all of the tail components with new ones and will try it after a while. Thanks for all the help guys.

[piper]

Well, I replaced all tail components and reset all of the calibration parameters on the Spartan 760 and my tail is now rock solid and no vibration. This is better than when it was new. It turns out that the vibration was caused by a slight weight difference in the tail blades. One measured 0.3 grams and the other would more often than not measure 0.4.
The actual weight difference was less than 0.1 gram but that was enough to make the tail vibrate like crazy.

[robl]

yes, best to just balance the tail as an assembly, I take mine off the shaft, and put a smaller metal rod through it and just put a little tape on the lighter blade till it balances out, now the tail spins perfect. Wasted so much time trying to get each tail blade balanced perfectly and the tail still didn't spin as smooth as it does now.