Imbalance around lengthwise flybar axis.

[DrJustice]

On my V2 the flybar assembly is imbalanced around the lengthwise axis (not the axis that the seesaw turns). It clearly tilts to one side, although not with much force. It can be made less worse by turning both flybar weights with the set screw in the opposite direction of the tilt.

The imbalance could be in the paddles or the control arm assembly, or it could be a bent flybar, I don't know which yet. BTW, everything is new and it all looks looks and fits perfectly good. The questions are, is this to be expected? Do people balance this assembly around the lengthwise axis? Does anybody bother to do it with the main and tail blades?

DJ
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[sleddog7]

Does this happen when the main blades are on? Take the main blades off and see if it does it.

Be sure the flybar (separate item) and paddles are the EXACT same distance from the head.

[DrJustice]

There are no links or blades on the head, so everything moves freely. The flybar is balanced around its teetering axis, so that's fine. The imbalance is around the lengthwise, or spanwise, axis of the flybar, so that e.g. one of the paddles could be heavier towards the leading or trailing edge.

DJ
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[sleddog7]

The FLYBAR is balanced, but when you put on the paddles (same distance out) they're no longer in balance?... is that what your doing??

[DrJustice]

No, around the "normal" teetering axis of the flybar, all is well. But around the lengthwise (or spanwise or pitchwise), i.e. 90 degrees in the horizontal plane from the flybar teeter. Below is an ASCII graphic showing the flybar assembly from above, hopefully making it clear:


|
/-----+ +-------+ +------+
--- | |----------|---O---|----------| | ---
| +------+ +-------+ +-----/
| |
| |
around this axis not around this axis


DJ
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[sleddog7]

Ahh, that's chordwise, not spanwise.

I never heard of a set of paddles having mis-matched chordwise CoG. I think the 'problem' may be something much simpler than that.

You MAY have a kink in the flybar rod within the paddle cage area... going through the bearings.
Has the rod ever been bent before and you tried to bend it back???

[DrJustice]

Sorry for not being clear. I would have thought it is around the lengthwise axis or along the chord, so to speak... :)

All parts are brand new, this bird has not flown yet. The flybar seems straight when rolling it on a flat surface. I guess I'll just have to take it apart and hunt for the imbalanced or bent component. I still wonder if people bother with stuff like this, i.e. balancing the components of the rotorhead, or even the head as a whole. Seems like a good idea to me, but that will have you filing away on the alu parts, and I've never read aout anyone that.

DJ
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[groundparrot]

Most paddles are heavier on the leading edge.This is not ideal.It won't hurt anything.Just live with it or make your own paddles.Refer to Chinese weight discussions to get a better understanding of how and what unbalanced paddles affect.