Shuddering with negative collective

lespaulrob · 07-15-2012, 10:45 AM

So I noticed a large bit of vibration when I would give some negative collective when trying to bring my 130x down (no 3d, just standard circuit flying). Any thoughts on this? I didn't see any wear on the gear after a 4 minute flight and was wondering if this was something that I could easily resolve.

lespaulrob · 07-15-2012, 10:46 AM

Note, this isn't the tail that's shuddering, it's the whole body.

GSPI · 07-15-2012, 10:49 AM

Have you changed the O-rings on the swash and head assembly with the canopy grommets?

d12bn · 07-15-2012, 11:34 AM

I find the canopy grommets are too thick. I cut some fuel line tubing and no more shakes.

lovespicyfood · 07-15-2012, 12:55 PM

Quote:

Originally Posted by GSPI

Have you changed the O-rings on the swash and head assembly with the canopy grommets?

This absolutely cured my shudders from hell.

lovespicyfood · 07-15-2012, 12:56 PM

Quote:

Originally Posted by d12bn

I find the canopy grommets are too thick. I cut some fuel line tubing and no more shakes.

Canopy grommets worked for me, but thanks for your post. Fuel tubing makes sense, is cheap and I would think last longer (less brittle) than the grommets...

lespaulrob · 07-15-2012, 01:35 PM

Yep, that fixed it! Man this thing flies sweet! I'm 4 flights in and it's really starting to break in (or more it's me relaxing with it!).

I'm going to take it out to a field later today and open it up.

Merse · 07-15-2012, 02:26 PM

Quote:

Originally Posted by lespaulrob

Yep, that fixed it! Man this thing flies sweet! I'm 4 flights in and it's really starting to break in (or more it's me relaxing with it!).

I'm going to take it out to a field later today and open it up.

the canopy grommets are a must to cure the shudders. flyies amazing after!!!

RapTH44 · 07-15-2012, 10:18 PM

I added half a canopy grommet to the existing rubber bushing on each blade grip and it cured half my shudder, the other half was due to the umbrella gear not being pushed all the way up on the main shaft, there was about 1/16" of play on there snd it made for an aweful shudder, even managed to pull the ball end off a blade grip partially during flight so check this often as it appears the umbrella gear can sink down the shaft a little.

Also noticed a small air bubble in the plastic for the ball on the main blade grip. So that probably contributed too.

07-15-2012, 10:45 AM	#1
lespaulrob Registered Users Join Date: May 2012 Location: Nashville, TN USA	Shuddering with negative collective So I noticed a large bit of vibration when I would give some negative collective when trying to bring my 130x down (no 3d, just standard circuit flying). Any thoughts on this? I didn't see any wear on the gear after a 4 minute flight and was wondering if this was something that I could easily resolve.

07-15-2012, 10:49 AM	#3
GSPI Registered Users Join Date: May 2012 Location: CLE	Have you changed the O-rings on the swash and head assembly with the canopy grommets? __________________ Beating the air into submission... one Blade® at a time! Lynx Heli Innovations Team Pilot SilentDRC.net -The Order of Brushless Witnesses

07-15-2012, 11:34 AM	#4
d12bn Registered Users Join Date: Jun 2011 Location: La	Hey I find the canopy grommets are too thick. I cut some fuel line tubing and no more shakes. __________________ Team MicroHeli Team HeliProz Check out my Youtube channel JJ Inverted Production http://www.youtube.com/user/JJInvertedProduction?feature=mhee

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07-15-2012, 10:46 AM	#2
lespaulrob Registered Users Thread Starter Join Date: May 2012 Location: Nashville, TN USA	Note, this isn't the tail that's shuddering, it's the whole body.

07-15-2012, 01:35 PM	#7
lespaulrob Registered Users Thread Starter Join Date: May 2012 Location: Nashville, TN USA	Yep, that fixed it! Man this thing flies sweet! I'm 4 flights in and it's really starting to break in (or more it's me relaxing with it!). I'm going to take it out to a field later today and open it up.

07-15-2012, 10:18 PM	#9
RapTH44 Registered Users Join Date: Jul 2012 Location: NY	I added half a canopy grommet to the existing rubber bushing on each blade grip and it cured half my shudder, the other half was due to the umbrella gear not being pushed all the way up on the main shaft, there was about 1/16" of play on there snd it made for an aweful shudder, even managed to pull the ball end off a blade grip partially during flight so check this often as it appears the umbrella gear can sink down the shaft a little. Also noticed a small air bubble in the plastic for the ball on the main blade grip. So that probably contributed too.