Washout arms not level on one side at midstick

[polysheep]

As per subject, it's confusing the hell out of me. All adjustments are done, swash is level. Servo horns 90. At midstick, washout arms are level on one side but not on the otherr side. Makes the flybar cage look tilted to one side : / don't think adjustable links can solve this. Anyone has any idea what the cause might be? Main shaft is new. Main blade grips are new.

[bradharvy]

I doubt this is your problem. However I went through hell and back fighting washout arms. Turned out it was my tracking was off. It looked good at mid stick, 0* pitch but in the air it was way off. Once fidiling around I finally got it. Just a thought..

[InFocus]

I'm not sure that the swash arms level or not would have anything to do with the links above it..

When doing setup, I work from the bottom up.

The swash arms level are strictly a function of the swash itself being at the proper height and level. So, level the servos at 90degrees, using subtrim as needed. then adjust the links between the servos and the swash so that the swash arms are level, throughout an entire revolution. This will also tell you that your swash is level.

Then with the swash level/swash arms level, adjust the upper links so that the blades are at 0 degrees pitch. When doing this, it is important that you manually hold the flybar level, otherwise your blade pitch readings will be off.

on edit: By 'level' I really mean 90degrees perpendicular to the main shaft. Note that the main shaft does have a very slight angle in the frame, this is normal to compensate for tail rotor thrust.

[Bananaslug]

Originally Posted by InFocus

Then with the swash level/swash arms level, adjust the upper links so that the blades are at 0 degrees pitch. When doing this, it is important that you manually hold the flybar level, otherwise your blade pitch readings will be off.

I saw a video once where the guy was using the blade holder to hold the flybar and it works great. Put the paddle in the top slot and attach it to your boom. You may have to work at it a bit to get it level and tight, but it is as easy as 1, 2. I would have said 1, 2, 3... but it's easier than that.

[spykez]

Originally Posted by polysheep

As per subject, it's confusing the hell out of me. All adjustments are done, swash is level. Servo horns 90. At midstick, washout arms are level on one side but not on the otherr side. Makes the flybar cage look tilted to one side : / don't think adjustable links can solve this. Anyone has any idea what the cause might be? Main shaft is new. Main blade grips are new.

Er.. Can't say for sure, but if you are pretty solid from servo arms to swash, the problem probably lies higher up. And one part of the head that has a lot of parts (more likely to have issues I guess) might be the flybar/flybar cage.

Also check linkages for lateral slop, one may be vey loose.

[polysheep]

oh wells, kinda suspecting that the washout control arms might be slightly bent in relation to the washout base. Bought a aluminium set to try, will install it tonight and see how it goes. Got the b400 aluminium swashplate as well just for the fun of it :x

[polysheep]

Deleted

[Thomas.Heiss]

Hi,

I am experiencing the same.

The swash out arms are not the same up/down level on each side.
I had 1-2 crashes.

Therefore the flybar cage is not 100% level as well as one bell mixer arm and both main blades are far off (after fine tuning blade tracking).

So the head after my swashplate is far away from being "perfect".


The Blade nevertheless flyings with 8-10 down elev trims of 0.5 steps and about 5 right ail trims of 0.5 steps.


Did you find the solution?
Where the wash out arms bent?
Bent wash out screws?

Did a new aluminium wash out arm set help?


Threads got also to my attention talking about additional step washers for the pitch to be able to successfully tighten up the wash out arm screws (too tigthen with hard wash out base movement because of twist or too loose with too much play).

Greetings

Thomas

[Thomas.Heiss]

Any update on this? I was therefore flying with front nick (works against pitch up in forward flight) and right roll trim.

Any RCGroups thread which describes this issue?

Have new alu washout arms fixed the issue for you?

[Thomas.Heiss]

Found links:
Washout arms not parallel: https://www.helifreak.com/showthread.php?t=51007
Blades go out of tracking: http://www.rcgroups.com/forums/showthread.php?t=1468317