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HomeAircraftHelicopterHIROBOOther › Carbon Extreme Dampers & Evo -- Bad fit?
11-06-2004 09:13 AM  13 years agoPost 1
pariah

rrVeteran

South Jordan, UT - United States of America

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I just installed a set of CarbonExtreme dampeners on my Evo50, and noticed something I didn't like: Now there is some play in the grips with relation to the spindle -- as if the spindle had grown by about 1mm or so. I didn't forget the washer(s) that space the yoke from the grip(s), however it seems as if I need to add another pair of washers.

This new gap doesn't seem normal to me, and I thought I should check. It seems to me that this leaves the possibility that the grips (and hence the rotor blades) would then (due to one of the grips being 1mm farther from the yoke than the other) be a cause of significant vibration, as well as other less obvious problems.

Would the proper solution be to shim both sides with another washer, to lock the grips into a 'centered' position on the spindle?

Thanks,

Pariah


--
The last thing I want in a heli is a few loose screws.

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11-06-2004 09:46 AM  13 years agoPost 2
Augusto

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US

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There seems to be a recent batch that came out shorter. I'm checking into it.
Please send an e-mail to CustomerService @ CarbonXtreme.com to return them for a replacement.
Regarding yourr question you can shim them to have no play and they would work exactly as expected.

Augusto.

Avant Aurora Ultimate

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11-06-2004 08:43 PM  13 years agoPost 3
HawkNoob

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Pa

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Augusto, what are the proper dimension on CX dampeners? I got a pair and want to make sure they are OK before I install them.
Thanks.

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11-06-2004 10:23 PM  13 years agoPost 4
I3DM

rrProfessor

Israel

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i seem to recall mine are just plain flush with the headblock once inserted...

www.liorzahavi.com

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11-06-2004 11:17 PM  13 years agoPost 5
rcjunky

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Cypress, CA

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pariah
You're not alone... Check out this thread: http://www.runryder.com/t139410p1/

I emailed Carbon Extreme as AUGUSTO suggested. Although I'm still waiting for the new dampers (recently emailed them my address), Customer Service was helpful and willing in trying to resolve the issue.

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11-07-2004 03:40 AM  13 years agoPost 6
Scotty

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Calgary, Canada

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Hi Guys ....My 2 cents
I have an evo 50 with the hyper50 and mp2 quite combo. I also installed the cx dampners and the heli had a continuous bobble at anything less than about 1850 on the head. What I found was the cx dampers extend beyond the head block and preload the thrust bearings. What I did was shave the cx dampers flush with the head block. I did this by installing the dampers in the head block and then after I was sure the were fully seated I used a very sharp blade to trim the damper flush with the head block. After putting it back together, I flew it and the head bobbles are gone..Fantastic cyclic response. I also did the ccpm conversion with jr8311's , rotortech 600's and 2000 on the head speed and it is a wickedly smooth heli with wild 3d performance. I have yet to bend a spindle and I has survived some pretty wild screw-ups! and of course everthing I have been able to throw at it..... Hope this helps.
Regards
Scott

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11-07-2004 04:32 AM  13 years agoPost 7
rcjunky

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Cypress, CA

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Hey Scotty...
Now if they could only make the dampers between your thick ones and our thin ones!

Any idea what thickness you ended up with after shaving your dampers?

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11-07-2004 04:41 AM  13 years agoPost 8
franz

rrApprentice

KINGSTON JAMAICA W.I.

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hi guys,
i assembled my evo with the sdg head and the carbon extreme dampners along with the normal dampners, os 50 hyper, 90size mp2,
600v blades, and have never seen a head wobble . the machine is as smooth as silk and extremely aerobatic.
best regards
franz.

FRANO

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11-07-2004 11:42 AM  13 years agoPost 9
reloader

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Baton Rouge, LA US of A

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Hi, all.
When I installed the CX dampers in my EVO 30 I was also changing the blade axle to a homemade one. I had the same problem, too much endplay, so I just took the axle out and cut, if I remember correctly, about 3mm off one end of the axle, making a good, snug fit with little or no play when I tug on the grips in the axial direction. Flys good, but I too have an intermittent side-to-side wobble unless I keep the headspeed above 1600. This wobble was there with the original dampers as well, so the CX has nothing to do with it in in my heli.
I checked the threads on this problem and tried all the remedies. Found the receiver/battery tray and the servo tray a little loose - tightened them, but no help. If I'm running low head speed and just give a quick left-then-right twitch on the aileron stick, the wobble starts and may or may not continue until another input is given, maybe a forward-aft one. Or sometimes it will just stop on its own!
Interesting problem!
Dave

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11-10-2004 04:05 AM  13 years agoPost 10
rcjunky

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Cypress, CA

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Replacement dampers arived today!
Thickness of ~7.07mm

NO MORE SLOP!! Main blade holders, bearings (thrust and radial) and spindle assembly fit perfectly.

Emailed Carbon Extreme Friday late afternoon, received them in the mail today. Thanks CX!!

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11-10-2004 11:46 AM  13 years agoPost 11
davehour

rrElite Veteran

Guayama, Puerto Rico 00785

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I'm happy your problem is solved.

For the record, What was the thickness of the bad dampeners?

Thanks.

David

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11-15-2004 01:51 AM  13 years agoPost 12
rcjunky

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Cypress, CA

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Bad dampers were 6.7mm in thickness.

Just a "hair" makes a difference!

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11-15-2004 07:53 PM  13 years agoPost 13
BigRob

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Long Beach, CA

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Replacement
A buddy of mine had gotten a bad set just a few weeks ago from a LHS. Do as Augusto said and notify CarbonXtremes customer service dept. and they'll get a 'corrected' replacement sent to you.

Thats what they did for my buddy and had it in a matter of days.


The one......
the only...
The BigRob

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11-15-2004 11:12 PM  13 years agoPost 14
rcjunky

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Cypress, CA

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Hey BigRob...
Missed your 1st place flight at Appollo field, congrats! Steve showed me the video of AZ poor canopy!

Do you have ANY play with the main blade holders on your Evo50? I guess I should ask first if you are using the stock head with CX dampers. (If your not, what are you using?)

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11-16-2004 12:08 AM  13 years agoPost 15
HawkNoob

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Pa

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Just measured mine, they are 6.82mm Should I send them back? What is the exact measurement supposed to be from the manufacturer???

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11-16-2004 12:19 AM  13 years agoPost 16
BigRob

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Long Beach, CA

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blade play
rcjunky, thanks. Honestly, I really just wanted to fly...they had to shut the whole flight line down for a contest and I didn't want to have to wait an hour to fly again. Never did a contest before, but it was sure fun and plan on participating in more events. It was nice to beat out the couple 90 size ships that participated with my little 50 powerhouse.

Nope, no main blade play at all...thats if you are referring to the spindle and grips...Only upgrade items i got on my Evo is the Carbon Xtreme dampers and their fin set. Everything else is pretty much all stock. "plastic fantastic!" Including the stock plastic yoke.


The one......
the only...
The BigRob

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11-16-2004 12:21 AM  13 years agoPost 17
mrNoodles

rrProfessor

Borlänge, Sweden

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Give them a try
Replace the standard dampers and check any eventual play before and after the CX ones was put in.

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11-16-2004 01:46 AM  13 years agoPost 18
rcjunky

rrNovice

Cypress, CA

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BigRob,
First contest, first place, awsome!

Blade play...
Replacing the CX dampers with thicker ones solved my initial problem, movement of main blade holders parallel to the spindle (push one blade holder in, the other pushes out about 2mm).

Parallel play to spindle is fine now, BUT, I notice that if I push up on the tip of the main blades the holders (grips) have slight PERPENDICULAR play to the spindle. Tightened spindle bolts with all washers and bearings. BTW, is there an "easy" way to get those bolts off the spindle without clamping the spindle in a vise and scuffing the spindle up?

Whatcha' think?

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11-16-2004 01:57 AM  13 years agoPost 19
BigRob

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Long Beach, CA

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Hmmmm
To my recolection this is normal..are you able to measure the amount of perpindicular movement? I'll have to look at mine when i get home tonight.


The one......
the only...
The BigRob

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11-16-2004 02:30 AM  13 years agoPost 20
rcjunky

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Cypress, CA

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Get home?! Busted, cool, all this from work! I use Window Washer, it automatically deletes all cookies and histories as I shut down my computer.

I'll have to meausre as well. Do you bend spindles as often as reported on RR?

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