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Helicopter
e-
Mikado
Other › tail rotor and skid vibrations
07-03-2008 02:41 PM  9 years agoPost 1
deepak kirpalan

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Trinidad and Tobago

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Hi Folks
I've been doing some flying lately. I now have about 212 flights on my 600 3d fly bar version.
Doing simple rolls flips stall turns etc. just the basic sttuff.
I have some vibes showing up on the vertical fin and on the skids. The tracking is dead on, the fly bar is centered all the nuts and bolts are tight.
Does any one have any ideas on what one should look so that I can eliminate the vibration?
Kindly let me know
Thanks
D

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07-03-2008 04:16 PM  9 years agoPost 2
Blackrat

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South Africa ;-)

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with nothing bent or broken i would be looking at a worn bearing, perhaps the thrust bearing in the tail grips ? check for 'notchiness'

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07-03-2008 05:24 PM  9 years agoPost 3
Terrabit

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Seattle, WA - USA

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I would recomend the following:

check all bearings including the motor
check tail shaft/rotors/hub assembly
check belt tension
check main gear for wobble
look for any slop in your servos or linkages

After 212 flights and assuming no crashes or hard landings, I suspect your problem is most likely a bad bearing. You may have one spining or moving in its recess. Don't forget the belt tensioner bearings.

Good luck!

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07-06-2008 03:15 AM  9 years agoPost 4
deepak kirpalan

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Trinidad and Tobago

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tail rotor vibes
Well,
I did some feeling around the tail rotor and found there was a lot of play in the blade grip where it screwed onto the blade holder.
Switched out all bearings and now everything is tight.Will fly tomorrow. Let you know how it works out.
Thanks
deepak

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07-07-2008 11:59 PM  9 years agoPost 5
deepak kirpalan

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Trinidad and Tobago

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tail rotor changed
Folks
Changed out parts but still have vibration.
Any ideas.
Let me know please
Thanks
d

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07-08-2008 01:54 AM  9 years agoPost 6
helicraze

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Victoria - Australia

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I had a problem on my E550, turns out the main gear had been worn funny causing vibs, took me 3 months to find it. Change the main gear maybe???

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07-08-2008 02:03 AM  9 years agoPost 7
deepak kirpalan

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Trinidad and Tobago

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re main gear
Just stripped one on friday last
Brand new gear on. Any other thoughts?
D

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07-08-2008 02:05 AM  9 years agoPost 8
helicraze

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Victoria - Australia

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Spindle straight? Could be bent from hard landing? Not running crap rotors? Could have thrown a weight.
Did you increase of decrease the RPM to see if it comes or goes?

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07-08-2008 02:10 AM  9 years agoPost 9
deepak kirpalan

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Trinidad and Tobago

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re spindle
Never took it out of the head and rolled on a piece of glass.
Vblades track properly and blade grips roll smooth to the touch.
Not exactly sure what you mean by throwing a weight or increase od decrease rpm to see if it comes or goes?
D

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07-08-2008 02:18 AM  9 years agoPost 10
Ronald Thomas

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Gainesville, Fl, USA

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The weight in the blades could have shifted. Increase/decrease the throttle curve to see if the problem happens only at a certain RPM....Ron

Team MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!

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07-08-2008 02:21 AM  9 years agoPost 11
deepak kirpalan

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Trinidad and Tobago

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weight in blade
Hi Ron
Long time no chat.
Dont understand what you mean. I'm using v blades. How would the weight shift?
D

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07-08-2008 02:30 AM  9 years agoPost 12
Ronald Thomas

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Gainesville, Fl, USA

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Yeah, long time Where ya been? If you were using woodies. Weights shift sometimes I meant. Sorry for the confusion....Ron

Team MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!

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07-08-2008 02:39 AM  9 years agoPost 13
deepak kirpalan

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Trinidad and Tobago

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Still here
Ron,
Just trying to figure how to get rid of the vibes.
Funny thing when its on the ground it seems not to vibrate as much ?
Any ideas?
D

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07-08-2008 07:00 AM  9 years agoPost 14
KC

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WA

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deepak, I had a similar vibe that was easy to fix.

tracking was fine, everything looked right, except in climbouts where I figured out it was the blades weren't rotating on axis.

all of the m0915 grips I have tried are tapered and very few blades are a perfect fit inside them except a few of the Mikado blades

order this and cut your own shims to fit,

http://www.onlinemetals.com/merchan...=299&top_cat=60

fwiw, 0.025 and 0.032 shims seem to be a good fit for most 12mm blades.

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07-08-2008 09:08 AM  9 years agoPost 15
fergus

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Ireland

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Maybe worn out damper rubbers in the head. Have they been changed at all since the first flight?

Regards

Fergus

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07-08-2008 01:21 PM  9 years agoPost 16
deepak kirpalan

rrApprentice

Trinidad and Tobago

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re vibes
Hey,
Thanks for the responses. I have not changed the dampers and the head is not as rigid as it once was. Perhaps I'd give it a try.
Thanks
Deepak

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07-09-2008 12:56 AM  9 years agoPost 17
deepak kirpalan

rrApprentice

Trinidad and Tobago

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tail rotor vibes
Hi Folks
Checked the main rotor head today.
Sheesh, found a destroyed thrust bearing. The balls of the bearing wer all over the place. There was a lot of play in the head as well.
Changed the thrust bearings and added the k&s dampers.
Will fly again tomorrow and let you know how it turns out.
Thanks for the advice guys
D

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07-09-2008 01:41 AM  9 years agoPost 18
helicraze

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Victoria - Australia

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sounds like it would be the problem

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07-09-2008 07:04 AM  9 years agoPost 19
KC

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WA

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K&S or K&B??? I still cross them up but I figure you mean K&B. If you are going to use those, use the thin shim from the Mikado 3092 dampener set between the dampener and the grip...the other shims (i.e. 2755, 2756) are too thick and will squeeze the thrust bbs.

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07-09-2008 01:14 PM  9 years agoPost 20
deepak kirpalan

rrApprentice

Trinidad and Tobago

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Re shims
I have used these. You're right the dampers are from K&B. Bit of a bran teaser there.
thanks
D

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Helicopter
e-
Mikado
Other › tail rotor and skid vibrations
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