freestyle
Veteran
Location: Redmond WA USA
| I get the impression you are describing a gyro-induced tail wag. This also goes hand-in-hand with your 'higher head speed' observation.
Perhaps the stock blades gave you a higher head speed than the woodies, that might make the gyro feedback too high, so you'd get a wag. That's easy to fix though, just turn the gyro gain down a couple/few percent until the wag goes away. Since the tail rotor is turning faster than before, you'll still get the same holding power, maybe even better.
Do the composite blades have a thinner airfoil than the woodies? That would not surprise me... that would mean less drag, thus higher head speed, thus tail wag.
Put the new blades back on, hover to verify that the wag is back, then turn the gyro gain down a couple percent and retest. Turn the gyro gain a couple more percent if necessary. If you can stop the wag and the tail still feels as locked as before, you've solved the problem, and your heli will probably fly better than it did with the woodies. You'll have more power (less wasted to drag), better autos (less rotor speed decay) and probably better tail rotor performance too (don't let the lower gain percentage fool you).
On the other hand, if the tail starts to feel sloppy before the wag goes away, I'm barking up the wrong tree. Tell us what happens.  |
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