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Other › Why the Hell does my ccpm trex wobble?
12-04-2005 01:32 AM  12 years agoPost 1
upperking

rrApprentice

Spring Hill, Florida

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When I start to throttle down a bit or turn it will start wobbling.
Why the hell is it doing this crap to me?
It don’t look nice when its doing that It looks like a weebles wobble but it will fall down if I don’t land it!!!
It is humiliating when it does this when people see it flying.

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12-04-2005 01:41 AM  12 years agoPost 2
dkshema

rrMaster

Cedar Rapids, IA

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Too slow a head speed? Wobbling on the larger helis is typically the result of running too low a head speed.

I haven't experienced a wobble in my Rexes, and I don't recall seeing wobbles in a T-Rex showing up here.

Of course, check the usual suspects if bumping up your head speed doesn't help - balance on the MR system and the TR system,

Are any of the plastic links in the MR controls tight? You might need to correct the fit of the plastic links on the balls.

Dave

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12-04-2005 02:26 AM  12 years agoPost 3
Ozydego

rrKey Veteran

Westerville, Ohio

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I get wobble when my battery is about to die and the headspeed falls, but I also get wobble if my blades are too tight in the grips... try loosening the blades a little and see if that cures it....

But Honey, I can't live with just stock.....

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12-04-2005 02:29 AM  12 years agoPost 4
upperking

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Spring Hill, Florida

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Do you run it in governer mode or full head speed while only using pitch?

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12-04-2005 03:49 AM  12 years agoPost 5
MikeInMobile

rrElite Veteran

Mobile, Alabama

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Wobble is ALWAYS caused by low headspeed ........... Reduce your pitch, and maybe increase your pinion size to increase your headspeed.

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12-04-2005 04:12 AM  12 years agoPost 6
Ozydego

rrKey Veteran

Westerville, Ohio

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Not always, like I said, blades being too tight has been the culprit as well...

But Honey, I can't live with just stock.....

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12-04-2005 05:04 AM  12 years agoPost 7
upperking

rrApprentice

Spring Hill, Florida

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I was using the EFLRS75 servos all the way around and I decided to change the elevator to a HS56 and it seems to have slowed down the bobbing somewhat compaired to before with the other servo. maybe I will change the other two and see if that helps..
Im thinking it could be some servos have a little to much play and the gearing does not hold them rock solid so you get wobble from the servo arms play?!?!/

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12-04-2005 06:06 AM  12 years agoPost 8
Kevino_heli_man

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Valencia, CA United States

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I always thought you were supposed to use three of the same servos for the swash or it can cause problem from one servo being faster than the other ones.

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12-04-2005 06:12 AM  12 years agoPost 9
nojohnny101

rrElite Veteran

10 miles north of Cincy, OHIO

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hey
m thinking it could be some servos have a little to much play and the gearing does not hold them rock solid so you get wobble from the servo arms play?!?!/
that could be a very real possibility

let us know what happens


Thanks
~Will~

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12-04-2005 07:18 AM  12 years agoPost 10
keyzrrVeteran - , UK - My Posts: All  Forum  Topic

the wobbles can be a number of things
1 head speed to low
2 ball links to tight
3 to much pitch
4 excessive play in the head control system
5 play within the servo's or arms
6 blades out of track
7 over tightened bearing lock nuts on or around the flybar control system
8 blades to tight

check all of them first but you will also notice the wobbles most of all with excessive beer consumption and to much canabis usage!!!!!
hope this helps

and yes if its ccpm you should realy use matching servos that center well

If you need to get high , go and fly !

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12-04-2005 01:17 PM  12 years agoPost 11
upperking

rrApprentice

Spring Hill, Florida

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Guess what!?! It was the servos.
after a while the stress on the servos wore them so they where loose enough so in flight they had to much play in flight and would allow a head wobble.
They did not do this as much when the servos were new..
but since i put new HS56 servos on the wobble went away...
I wonder if the HS56 will loosen up after a while of usage and then wobble again I will see..
I guess cheaper servos should not be used...

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12-04-2005 02:13 PM  12 years agoPost 12
Ozydego

rrKey Veteran

Westerville, Ohio

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The HS56's use ball bearings, so they won't wear out and wobble like servos with plastic bushings.....

But Honey, I can't live with just stock.....

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12-04-2005 03:44 PM  12 years agoPost 13
TheX

rrApprentice

Newport Beach, California

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Looks like it isn't ALWAYS head speed eh?

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12-04-2005 09:59 PM  12 years agoPost 14
MikeInMobile

rrElite Veteran

Mobile, Alabama

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Actually, it IS headspeed ......... The slop in the servo becomes a non-issue once the headspeed exceeds 1900 RPM. If the headspeed is too low, any slop in the servo allows the head mechanics to deviate from the normal rotational mass center. I have machines with EXTREMELY sloppy servos and with a headspeed of over 1900 RPM, the slop is not an issue.

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12-09-2005 02:22 PM  12 years agoPost 15
upperking

rrApprentice

Spring Hill, Florida

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By changing to ball bearing servos it doesnt do it at low head speeds..

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01-01-2006 08:38 AM  11 years agoPost 16
Kevino_heli_man

rrApprentice

Valencia, CA United States

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I finally got my SE working and I just realized I have the same problem. It wobbles like a top. It's not headspeed, 2800+, ball links are good, pitch is +5 -- +7 in hover so I don't think its too much pitch. Excessive play in head system.......It could be a bad headblock, out of true but i'm not sure. No play in the servo horns, Brand new out the box HS 56's servo horns on tight, blades a tracking so good they dissappear, but no seriously they track good. I did losen the blades, they were I guess too tight but I will try that too see if that was the problem.

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01-01-2006 08:56 AM  11 years agoPost 17
Kevino_heli_man

rrApprentice

Valencia, CA United States

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I just went through EVERYTHING and it turned out it was the blades. I just losened the blades and it seemed to not wobble anymore. Thanks for the help.

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