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deepak · 03-07-2011, 10:11 PM

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

kanglou · 03-07-2011, 10:16 PM

Check all 3 mainshaft bearings if they goes smooth?nothing in the head that is loose?

deepak · 03-07-2011, 10:17 PM

Not that I can tell.
Everything seems smooth. Head tight on shaft .
Any other ideas
D

kanglou · 03-07-2011, 10:30 PM

Do you run mikado vbar on your machine?

kanglou · 03-07-2011, 10:33 PM

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?

deepak · 03-07-2011, 10:49 PM

Hi
Will do the vibration analyzer tomorrow and post my findings
Thanks
d

Daniel Jetschin · 03-08-2011, 12:56 AM

Hi

Whats your Rpm?

Cletus · 03-08-2011, 07:40 AM

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?

deepak · 03-08-2011, 07:59 AM

Morning.
Rotor rpm set to , 1800.1900.2000
does the hula at all 3 settings
D

deepak · 03-08-2011, 08:01 AM

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

Cletus · 03-10-2011, 02:51 PM

Lower is sweeter

Laurens · 03-11-2011, 11:01 AM

Are those QuickUK servo horns?

deepak · 03-11-2011, 11:20 AM

Yes Laurens,
They are the 9.5mm ones.
Working out nicely
regards
d

united737pilot · 03-11-2011, 04:06 PM

Cletus: did you cut down your avant head and use the holes where the flybar carrier was?

Cletus · 03-11-2011, 04:38 PM

Quote:

Originally Posted by united737pilot

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.

united737pilot · 03-11-2011, 04:58 PM

Wow. Very Nice!!!
Also, what blade grip arms are those?

deepak · 03-12-2011, 09:03 PM

Hehe
Wobble and vibration gone!! Finally a vibe free heli.
Main shaft was not true and bearings were shot?
Finally. She's sweet.

Cletus · 03-13-2011, 06:06 AM

COOL! ....I've been a fan of SKF bearings for a long time! Use them almost exclusively in all the machinery at my factories.

Laurens · 03-13-2011, 06:10 AM

Have you crashed the aurora before? Or where they bad from the beginning?

deepak · 03-13-2011, 09:20 AM

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

03-07-2011, 10:11 PM	#1 (permalink)
deepak Registered Users Join Date: Jul 2007	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 __________________ deepak kirpalani Deepak.g.kirpalani@gmail.com

03-07-2011, 10:17 PM	#3 (permalink)
deepak Registered Users Thread Starter Join Date: Jul 2007	Not that I can tell. Everything seems smooth. Head tight on shaft . Any other ideas D __________________ deepak kirpalani Deepak.g.kirpalani@gmail.com

03-07-2011, 10:49 PM	#6 (permalink)
deepak Registered Users Thread Starter Join Date: Jul 2007	Hi Will do the vibration analyzer tomorrow and post my findings Thanks d __________________ deepak kirpalani Deepak.g.kirpalani@gmail.com

03-08-2011, 12:56 AM	#7 (permalink)
Daniel Jetschin Registered Users Join Date: Nov 2004	Hi Whats your Rpm? __________________ Team Compass; Optipower Europe; Graupner

03-08-2011, 07:40 AM	#8 (permalink)
Cletus Registered Users Join Date: Apr 2009	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? __________________ A helicopter in flight is a working demonstration of all the basic physical laws of the universe in action. Member: AMA 928457 - IRCHA 3449

03-07-2011, 10:16 PM	#2 (permalink)
kanglou Registered Users Join Date: Feb 2008	Check all 3 mainshaft bearings if they goes smooth?nothing in the head that is loose?

03-07-2011, 10:30 PM	#4 (permalink)
kanglou Registered Users Join Date: Feb 2008	Do you run mikado vbar on your machine?

03-07-2011, 10:33 PM	#5 (permalink)
kanglou Registered Users Join Date: Feb 2008	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?

03-08-2011, 07:59 AM	#9 (permalink)
deepak Registered Users Thread Starter Join Date: Jul 2007	Morning. Rotor rpm set to , 1800.1900.2000 does the hula at all 3 settings D __________________ deepak kirpalani Deepak.g.kirpalani@gmail.com

03-08-2011, 08:01 AM	#10 (permalink)
deepak Registered Users Thread Starter Join Date: Jul 2007	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 __________________ deepak kirpalani Deepak.g.kirpalani@gmail.com

03-10-2011, 02:51 PM	#11 (permalink)
Cletus Registered Users Join Date: Apr 2009	Lower is sweeter __________________ A helicopter in flight is a working demonstration of all the basic physical laws of the universe in action. Member: AMA 928457 - IRCHA 3449

03-11-2011, 11:01 AM	#12 (permalink)
Laurens Registered Users My HF Map location Join Date: Apr 2004	Are those QuickUK servo horns? __________________ Logo 800/Jeti DS16

03-11-2011, 11:20 AM	#13 (permalink)
deepak Registered Users Thread Starter Join Date: Jul 2007	Yes Laurens, They are the 9.5mm ones. Working out nicely regards d __________________ deepak kirpalani Deepak.g.kirpalani@gmail.com

03-11-2011, 04:06 PM	#14 (permalink)
united737pilot Registered Users Join Date: Feb 2007	Cletus: did you cut down your avant head and use the holes where the flybar carrier was? __________________ united737pilot

03-11-2011, 04:58 PM	#16 (permalink)
united737pilot Registered Users Join Date: Feb 2007	Wow. Very Nice!!! Also, what blade grip arms are those? __________________ united737pilot

03-12-2011, 09:03 PM	#17 (permalink)
deepak Registered Users Thread Starter Join Date: Jul 2007	Hehe Wobble and vibration gone!! Finally a vibe free heli. Main shaft was not true and bearings were shot? Finally. She's sweet. __________________ deepak kirpalani Deepak.g.kirpalani@gmail.com

03-13-2011, 06:06 AM	#18 (permalink)
Cletus Registered Users Join Date: Apr 2009	COOL! ....I've been a fan of SKF bearings for a long time! Use them almost exclusively in all the machinery at my factories. __________________ A helicopter in flight is a working demonstration of all the basic physical laws of the universe in action. Member: AMA 928457 - IRCHA 3449

03-13-2011, 06:10 AM	#19 (permalink)
Laurens Registered Users My HF Map location Join Date: Apr 2004	Have you crashed the aurora before? Or where they bad from the beginning? __________________ Logo 800/Jeti DS16

03-13-2011, 09:20 AM	#20 (permalink)
deepak Registered Users Thread Starter Join Date: Jul 2007	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 __________________ deepak kirpalani Deepak.g.kirpalani@gmail.com

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