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HomeAircraftHelicopterBeginners Corner › Tail Vibration
03-05-2008 12:07 AM  10 years agoPost 1
Mighty Mouse

rrApprentice

Deep South

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I've got a bad shake up and down of about 1 inch at hover. SO much that my boom pull loose. Think maybe it may be tail rotors out of balance as I have hit the asphault a few times. Any other ideas?

It is on a older Hawk II.

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03-05-2008 01:12 AM  10 years agoPost 2
Markus87

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Melbourne, AU

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If you think its the tail rotors check them out, see if their balanced. If you've hit the tail on the ground a few times also check that the tail rotor shaft is straight, if its bent you going to get some nasty vibes too. also check your belt and your gear teeth make sure you havent stripped anything. Also check how tight the belt is, make sure its not skipping....

the list goes on

Mark

"Takeoff is optional, landing is not"

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03-05-2008 01:42 AM  10 years agoPost 3
Mighty Mouse

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Deep South

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Thanks for the help. I'll check out the blades and shaft. No belt.

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03-06-2008 01:01 PM  10 years agoPost 4
newflyer2008

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edgefield

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Check your gear mesh also.

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03-06-2008 09:32 PM  10 years agoPost 5
Mighty Mouse

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Deep South

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Which gear mesh? I know the main gear clearance is ok, but the others, I am not sure are adjustable.

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03-07-2008 01:10 AM  10 years agoPost 6
Robin Jackson

rrNovice

Richmond, VA. USA

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I bet the Tail-rotor hub isn't true any more. It would take a chunk to knock the balance out of the blade for the vibration that you're describing. At the speeds your tail-rotor turns, it wouldn't take much of a bend to get what you have. The output shaft is another suspect.. But I still bet it's the hub.

while looking at the tail-rotor track from behind, Spin the head up just a little. You don't have to spin the head all the way up to see what you're looking for. If that's your problem It should leave track pretty quick.

Something else to consider.

Cheers,

Robin Jackson

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03-13-2008 12:34 PM  10 years agoPost 7
JetFire

rrKey Veteran

The Golden STATE

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Check that shaft..
After reviewing your gallery, cause wasn’t sure about an older hawk, you definitely have a shaft driven tail. Tail boom strikes can easily bend that shaft. I would start there. I prefer shaft driven tails myself however, they are not as resistant to boom strikes as belts. Even a slight dent on the boom can throw your alignment off.

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03-13-2008 05:34 PM  10 years agoPost 8
MichaelP

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Northumberland UK

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Is your engine running ok? you can get all kinds of vibrations with an out of tune engine.

http://www.webstarts.com/micksscalehelicopters

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03-13-2008 05:43 PM  10 years agoPost 9
Mighty Mouse

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Deep South

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The wire appears to be in good shape. The engine could be suspect I suppose. I runs well, perhaps on the rich side. But is starts fine and hovers well. It doesn't sound like it is missing any. I do have a TT36 I could drop in there fro kicks. I have notice you can notice the movement starting at idle. I think it could be in front somewhere. I am going to take the tail off and rev it a bit to see.

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03-13-2008 06:04 PM  10 years agoPost 10
MichaelP

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Northumberland UK

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Let us know how you get on.

http://www.webstarts.com/micksscalehelicopters

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03-15-2008 06:01 PM  10 years agoPost 11
Dilbeck

rrElite Veteran

Springdale Arkansas

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An up and down tail shake is usually an indication of too low a head speed or dampers to tight as apposed to a left to right tail wag which is something totally different. This is only if its not been crashed and just started this after an upgrade or a change in pitch/throttle curve in the radio. Did this just start or did it start after some change?

Clint

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