JR 8711 jitter's on my 102'  
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All Forums >> RC Airplanes >> Giant Scale Aircraft - 3D & Aerobatic >> Quique's Aircraft Support >> JR 8711 jitter's on my 102'
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JR 8711 jitter's on my 102' - 4/22/2008 6:56:37 AM   
marc 540


 

Posts: 251
Joined: 5/7/2005
From: HUNTINGTON, IN, USA
Status: offline 		Hi all,
my 8711 on the rudder of my Yak 102' has the jitter's and I was wondering if I should send it in or if this is normal? It didn't start doing it until about the 20th flight and it's on a pull pull system. My biggest fear is a hard over rudder in mid-flight. I have 5955's everywhere else with no problem's.

Thank's Marc 540
       Post #: 1

RE: JR 8711 jitter's on my 102' - 4/22/2008 2:16:00 PM   
octanehuffer



Posts: 663
Joined: 7/15/2006
From: Lakeland, MN, USA
Status: offline 		Maybe contact the manufacturer?

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QQ 86" Evolution, QQ 69" Saito 1.25, QQ 49" 32SX, QQ E-Yak, Funtana 90 Saito 1.20, H9 T-Craft G-26, etc

(in reply to marc 540)
       Post #: 2

RE: JR 8711 jitter's on my 102' - 4/22/2008 5:11:48 PM   
Rezagh


 

Posts: 1734
Joined: 6/10/2004
From: Rancho Santa Margarita, CA, USA
Status: offline 		This is normal. 8711 has 0 dead band. Being a single servo on the rudder and not seeing the weight of the control surface plus the fact the tension of the cables are not 100% identical, it jitters to find the surface. With slightest amount of force, it stops!

Reason you are seeing this after 20 flights or so is that gears mesh in (not sloppy but mesh in) after 30 min-60 min flight time!

If you had two servos on rudder you would not see this because there would be slight amount of fight that would keep this from happening!

Reason you are not seeing this with HiTec servos is that they are not 0 dead band.

Tighten your pull and ignore it because once the air flows over the surface it will stop. If this was on Aileron, weight of the control surface would fill that small void and not jittering as result but rudder is vertical and its weight is not applied to the servo plus it is pulled by the cables.

Thank you,
Reza
quote:

ORIGINAL: marc 540

Hi all,
my 8711 on the rudder of my Yak 102' has the jitter's and I was wondering if I should send it in or if this is normal? It didn't start doing it until about the 20th flight and it's on a pull pull system. My biggest fear is a hard over rudder in mid-flight. I have 5955's everywhere else with no problem's.

Thank's Marc 540



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Quique's Aircraft Company

(in reply to marc 540)
       Post #: 3

RE: JR 8711 jitter's on my 102' - 4/23/2008 6:01:30 AM   
dbcaster


 

Posts: 293
Joined: 7/1/2006
From: Petaluma, CA, USA
Status: offline 		I must disagree with this. I have two 8711's on my Dalton in a push/pull configuration. I also have two 8711's on my ailerons. I am getting jitter on both the rudder and ailerons.

(in reply to Rezagh)
       Post #: 4

RE: JR 8711 jitter's on my 102' - 4/23/2008 3:24:08 PM   
Rezagh


 

Posts: 1734
Joined: 6/10/2004
From: Rancho Santa Margarita, CA, USA
Status: offline 		If so, yours might have problems maybe with Pot or too much slop! You may want to contact HH. However on rudder with single servo this is normal!

On the push pull rudder, you still have some minor play with linkages that's what's causing it but if you are saying your aileron jitters under its weight that is not normal! Aileron should not jitter. Weight of the surface in a 35-40% plane should be enough to make the servo settle down. Push-Pull and rudder is very possible to show jitter a little but not normal on the aileron.

Reza


quote:

ORIGINAL: dbcaster

I must disagree with this. I have two 8711's on my Dalton in a push/pull configuration. I also have two 8711's on my ailerons. I am getting jitter on both the rudder and ailerons.



_____________________________

Quique's Aircraft Company

(in reply to dbcaster)
       Post #: 5

RE: JR 8711 jitter's on my 102' - 4/25/2008 1:45:52 PM   
bob_nj


 

Posts: 3474
Joined: 12/3/2001
From: Vineland, NJ, USA
Status: offline 		It's common for the pot to go bad, and the gears to wear on the 86 and 8711.
Once it starts, it's hard to stop.
If you happen to have two of them together on a rudder, you can fool it by adjusting the sub trim on each servo.
This sort of takes care of it for awhile, but the pot and gears don't get any better.

I replaced one 8611a on my 102 rudder with a single 5955, and for my style of flying, it's working fine.
I do a lot of slow to moderate freestyle and 3D, so it works for me.

Good Luck
Bob

(in reply to Rezagh)
       Post #: 6

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