lama v4 botom blades tracking - RC Groups
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Aug 13, 2007, 06:29 PM
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lama v4 botom blades tracking

Top tracking is done wih the ball link but what about the botum blades?
I have a wierd vibration that couses one blade to vibrate out of track every 1/2 sec or so.

any sugestions?
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Aug 14, 2007, 01:09 AM
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same problem here, not sure how to solve it
Aug 14, 2007, 01:12 AM
Registered User
check outer and inner shaft straightness and swashplate for becoming separated.

See if the servo arms are jittering, or if it is just the swash, or even just the lower blades or head themselves.

perhaps spin up the shafts without blades, one at a time, and see if there is still vibration? With or without the flybar installed. (it can throw the upper head into oscillation, causing vibrations in the outer shaft)
Aug 14, 2007, 11:00 AM
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ktm520's Avatar
you have to twist the blades in order to add/remove pitch. imo, its better to add pitch to the lower blade. it take quite a bit of twist because the blade will spring back. its one of those trail and error things.
Aug 14, 2007, 07:29 PM
Registered User
canadianfan ; i balance blades / flybar by disconencting the other motor and then add tape to the middle of one blade then test , move to the other blade if vibrations increased or add more if they became less untill it runs smooth.
Also spin up top with flybar only to check ballance and then balance the top blades liek the botum ones and set tracking.
my swash is the aluminium one as is the lower head / bladegrips ; top is stock plastic.
Servo's are fine too btw and the axles are strigth too
i think some of the problem is resonace frequency since it does not happen with only the botum running.
It shows also by the tail vibrating UP-DOWN and not left right like unballanced blades would.

so there is a lot i need to learn about this heli
Mar 04, 2009, 01:17 AM
Registered User

Blade balancing

It may sound very basic but the simplest way to balance blades top or bottom is to take them off the helo, bolt them together and 'hang' them over a knife blade above a flat hard surface. If one blade is heavier than the other, the distance to the surface will be different. Small strips of insulation tape make very good balance's a walk in the park and will smooth out miscellaneous vibration.
Try this before you go to the trouble of dismantling the drive mechanisms....good luck
Mar 04, 2009, 05:02 AM
Registered User
kodak_jack's Avatar
This is a problem for me too. BTW, this should be in the Lama 4 thread, but that being said, why don't any of you guys ever post there? There's good stuff in there.

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