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HomeAircraftHelicopterAlignT-REX 600N › uneven cyclic
06-07-2009 09:36 PM  9 years agoPost 1
datidun

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N Ireland

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im trying to figure out why i have uneven cyclic on both, all my rods seem to be matched the same lengh ,i have 6 degrees on one side of elevator and 8 on the other ,is there a specific rod ,many thanx.

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06-07-2009 11:23 PM  9 years agoPost 2
Sam2b

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Tacoma, WA

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When you say "on both ends" do you mean towards the tail and nose? Or do you mean up elevator & down elevator?

_Sam B_

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06-07-2009 11:59 PM  9 years agoPost 3
datidun

rrKey Veteran

N Ireland

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i mean on forward elev and backwards elev ,also on left aileron and right aileron ,i cant figure this one out ,for exzample backwards elev i have 6 degrees on forward i have 8 degrees all the rods are equal distance trying to get them equal

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06-08-2009 12:28 AM  9 years agoPost 4
baddynergy

rrElite Veteran

sierra madre, ca- usa

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swash plate is not centered in its mid position and or not level. If ALL lnkages are identical lengths, you need to start checking to make sure they are the correct length.

**Unattended children will be givin a shot of espresso and a puppy**

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06-08-2009 12:34 AM  9 years agoPost 5
datidun

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N Ireland

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thanx ok i have my swash mix as follows aile is +48 elev +57 pitch -60 are they all suppose to be set at 60 maybe this has something to do with it

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06-08-2009 02:46 AM  9 years agoPost 6
baddynergy

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sierra madre, ca- usa

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The swash values have nothing to do with unequel for and aft and roll cyclic. The problem lies in your linkage.

**Unattended children will be givin a shot of espresso and a puppy**

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06-08-2009 04:17 AM  9 years agoPost 7
Sam2b

rrElite Veteran

Tacoma, WA

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My original thoughts are one or both of the following. I've experienced the same problem when:

1) The blade being measured is not 90 degree perpendicular to the main shaft (or 180 degrees from the other blade grip & blade).
2) The flybar is not perpendicular to the main shaft upon measuring.

Point #1 above is solved by making the blades pretty snug with the blade grip bolt and then spin up the heli to about 1,000 RPM or more and then let it come to a complete stop on its own. Do not stop the blades with your hands. The goal is to preserve the two blades being perfectly 180 degrees from each other. Carefully pick it up and put it on the workbench and measure the pitch again, and make sure the flybar is perpendicular or parallel with the boom.

One's efforts to make the blade straight via eyeballing or other methods will not be the same as simply spooling up the heli. Can't spool it up right now? Wait until you get out the field to get a perfect measurement, and get a temporary measurement for now.

I hope that makes sense. It is way more simple than it may sound while reading the procedure. The exaggerated effect is if you measured your pitch while the blade is rabbit ear'd a little. The blade being measured needs to be perfectly straight that only centrifugal force can accomplish.

Thanks for listening.

_Sam B_

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06-08-2009 04:51 AM  9 years agoPost 8
TmMugen

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Tiny Little Red Dot aka Singapore

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Check your servo centering?

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06-08-2009 04:59 AM  9 years agoPost 9
dkshema

rrMaster

Cedar Rapids, IA

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Just for fun, what did you do, if anything, with the endpoint/travel limit adjustments on your elevator, aileron, and pitch servo channels? Did you leave them at 100%, or did you adjust them to some other number?

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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06-08-2009 05:53 AM  9 years agoPost 10
Daved Gutierrez

rrVeteran

Chicago, IL

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i had the same isue and the problem was that the swashplate was not center so check your links i used a swashplate leveling tool to do this, one of my links was off by a turn and the result was that i was having uneven pitch and it also felt like a tail heavy helicopter.

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06-08-2009 11:04 AM  9 years agoPost 11
datidun

rrKey Veteran

N Ireland

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thanx for all the info ,i will go through the whole set up again getting the bell cranks perfect 90 degrees ,and try to get servos centred ,sometimes i have to add a bit of sub trim even if the wheels are on perfect to get them centerd ,it has to be one of the links ,yes all my atv is at 100%

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