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soloboss -> RE: cx shake (5/11/2008 7:48:42 PM)
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When I get a shake that bad I start by pulling off the upper and lower blades and the fly bar. Then I check to see that the bearing at the top of the outer shaft is seated. Those get knocked loose and the inner shaft has no control.
Then, with all of the heavy stuff removed, spin the inner shaft, then the outer shaft. If those are good, spin them together at about 1/4 speed. If each shaft is out just a little, they will look worse when you spin them together. They should be perfect, but chasing that will make ya nutz! Shoot for 'Darned good' and let it go at that. If one is bent, it can be straightened - or replaced.
Now put on the flybar and check that. I got a flybar that was out of balance. It was straight as a laser, but one end was heavy. I took out the brass weight (from the rubber boot) on the heavy end and sanded it a little at a time until the flybar ran true. If the flybar won't spin dead true at speed, you won't get the heli tuned.
When you are satisfied to this point, balance a pair of upper blades. Snap the two blades together and balance the balls on a hard edge and check the balance. Balance with tape as required.
Install the blades and check the tracking. Adjust the link between the flybar and blades to set the tracing dead-on. Perfect is not required, but vibrations all add together, so better is always better.
When you are happy with that, add the lower blades - oops, balance them first - then install them. Again, check the tracking. If they are off, they are a power hog and they'll shake the heli. If they are out of track, pull them off and try another pair until you get a pair that plays together well. (Hint - boiling the blades will restore them to the original shape. Boil water, add blades, boil gently for a minute and hang out to dry. That should make them perfect.)
Maybe the answer is in here somewhere.
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