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cx shake - 5/11/2008 2:05:18 AM   
Speed-Limit



Posts: 66
Joined: 5/10/2008
From: Manson, IA, USA
Status: offline 		Hi,
I have a blade cx and it has a terrible shake, so bad you cant fly it. i think it might be the shaft but if you guys could help me, that would be awesome, thank you in advanced.

_____________________________

Hyper ST
Life moves pretty fast. If you dont stop and look around once and a while, you could miss it.
       Post #: 1

RE: cx shake - 5/11/2008 3:09:03 AM   
goldslinger


 

Posts: 1193
Joined: 5/3/2007
From: GARDEN CITY, KS, USA
Status: offline 		If this has happened after a crash, I would suspect the flybar right off; replace or manipulate it until it is TRUE!
If still present, spool up one motor at a time using rudder stick and see from viewing from top, which shaft is bent; (wobbling) then replace.

Gary


_____________________________

" No Excuse for My Failures; No apologies for My Success."
_____________________________________________

(in reply to Speed-Limit)
       Post #: 2

RE: cx shake - 5/11/2008 3:30:27 AM   
Speed-Limit



Posts: 66
Joined: 5/10/2008
From: Manson, IA, USA
Status: offline 		it was after a crash and the fly bar was bent so i got a new one. i havent checked the shaft but will soon. if top blade wobbles it is the outer shaft and lower it is the inner shaft, right? Thanks.

_____________________________

Hyper ST
Life moves pretty fast. If you dont stop and look around once and a while, you could miss it.

(in reply to goldslinger)
       Post #: 3

RE: cx shake - 5/11/2008 7:48:42 PM   
soloboss


 

Posts: 1467
Joined: 9/17/2006
From: Fort Wayne, IN, USA
Status: offline 		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.

_____________________________

Soloboss
If everyone''s thinking alike, then somebody isn''t thinking . . . G. Patton

(in reply to Speed-Limit)
       Post #: 4

RE: cx shake - 5/14/2008 1:44:21 PM   
DRAGONFIRE81M


 

Posts: 872
Joined: 1/9/2007
From: PORTLAND, TN, USA
Status: online 		most of the wobble i get after a crash is from a bent inner shaft . as far as the fly bar goes its the same one that came with the heli i just try to bend it back in to shap a little iand its fine. but i check my innner shaft by holding the heli eye level and keying in a low rpm spin and whach the flybar mount to see if it wobbles

(in reply to soloboss)
       Post #: 5

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