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Old 03-07-2011, 10:11 PM   #1
deepak
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Question wobble

Folks
Have any of you experienced a wobble, much like a hula dancer, on your machine.
Cant figure out what it is. advice appreciated
Thanks
D
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Old 03-07-2011, 10:16 PM   #2
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Check all 3 mainshaft bearings if they goes smooth?nothing in the head that is loose?
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Old 03-07-2011, 10:17 PM   #3
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Not that I can tell.
Everything seems smooth. Head tight on shaft .
Any other ideas
D
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Old 03-07-2011, 10:30 PM   #4
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Do you run mikado vbar on your machine?
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Old 03-07-2011, 10:33 PM   #5
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well deepak i saw that you run vbar in the another thread.So how does the spektrum analyzer look like if you have run it?Maby you can lockate where the vibes are?

Maby you should check the TT?So the bearings gooes smooth and the TT is straigt?
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Old 03-07-2011, 10:49 PM   #6
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Hi
Will do the vibration analyzer tomorrow and post my findings
Thanks
d
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Old 03-08-2011, 12:56 AM   #7
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Hi

Whats your Rpm?
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Old 03-08-2011, 07:40 AM   #8
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From your description of a "Hula Dancer" it suggests a slow, orbital, oscillation. Assuming normal head-speeds, anything in the head would result in a vibration associated with the head-speed and not the "Hula" thing. My thinking is the "Hula" may be an oscillation setup by the Vbar system as it tries to correct the aircraft's attitude. Look at the setup carefully, inspect the spec analyzer and what about auto trimming?
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Old 03-08-2011, 07:59 AM   #9
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Morning.
Rotor rpm set to , 1800.1900.2000
does the hula at all 3 settings
D
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Old 03-08-2011, 08:01 AM   #10
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Cletus
The auto trim was done prior to changing the head.
I did try to adjust the gains on the gyro to no effect. Have not had the chance to do the spectrum thing yet.
Hopefully today.
Thanks
d
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Old 03-10-2011, 02:51 PM   #11
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Lower is sweeter
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Old 03-11-2011, 11:01 AM   #12
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Are those QuickUK servo horns?
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Old 03-11-2011, 11:20 AM   #13
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Yes Laurens,
They are the 9.5mm ones.
Working out nicely
regards
d
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Old 03-11-2011, 04:06 PM   #14
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Cletus: did you cut down your avant head and use the holes where the flybar carrier was?
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Old 03-11-2011, 04:38 PM   #15
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Quote:
Originally Posted by united737pilot View Post
Cletus: did you cut down your avant head and use the holes where the flybar carrier was?
No, that’s a Custom Short-block I machined from billet for Deepak, to solve his "wobble" issues and gain him some increased cyclic agility.
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Old 03-11-2011, 04:58 PM   #16
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Wow. Very Nice!!!
Also, what blade grip arms are those?
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Old 03-12-2011, 09:03 PM   #17
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Hehe
Wobble and vibration gone!! Finally a vibe free heli.
Main shaft was not true and bearings were shot?
Finally. She's sweet.
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Old 03-13-2011, 06:06 AM   #18
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COOL! ....I've been a fan of SKF bearings for a long time! Use them almost exclusively in all the machinery at my factories.
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Old 03-13-2011, 06:10 AM   #19
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Have you crashed the aurora before? Or where they bad from the beginning?
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Old 03-13-2011, 09:20 AM   #20
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Remember Laurens
This is the second main shaft which was not true. I believe the shafts and vibration combo helped destroy them.
I had no crashes but I did have the heli roll left before take off in the earlies twice. Cost me a spindle, main shaft and blades both times. After using zeal tape on the vbar sensor I got it to settle down and work like it should.
The short block is awesome. Flip and roll much tighter.
Thanks
regards
D
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