Servo linkage alignment

[Basejump]

I have just put some Futaba 3050`s into a standard plastic frame.
The linkages to servo`s from the levers are a quite a angle.
It is the same if i mount the balls on the inside or outside of servo wheel.
Is this a problem using Futaba?
Can you get a straighter run using a different servo.I have no Hitec etc to try.

[Happy|Harry]

i am using futaba 9252's with the rubber grommets and the balls on the inside of the servo arm and i have a straight run, on my second hurri i have JR/Spektrum DS821's again with the grommets but this time the balls on the outside of the servo arm but again a straight run. are you using the rubber grommets? or just mounting the servos directly to the frame?

[istandalone]

are you using smaller size wheels? if your wheels need to be about an inch in diameter for the links to be parallel.

[Basejump]

When i say straight a i mean along the frame.
I can get the links paralell but it is the alignment from levers to discs.

[Happy|Harry]

perhaps posting a pic would be the best way for us to see your setup so we can suggest how to correct this problem :)

phil

[Basejump]

Digi cam no work at moment,i will try to explain again.
When i place 3050`s in the space`s for pitch,ail and ele the servo wheel ends up at a fixed point.
This point is not inlign with the control levers at pitch,ail and ele.
Looking down from above frame the linkages are angled out.They work but it does not look right.
If i put balls on inside or outside of servo wheel it still is not parrarell.
It seems the distance of thr output shaft from lugs of servos is causing the problem.
I am not talking about getting the links parralell to each other on setup.

[istandalone]

i guess the only other thing i can think of is what happyharry asked. how are you mounting them? are you using rubber grommets? or some sort of cf servo mount bracket?

[Pinecone]

You can put the balls on the inside or out, the heli won't know the difference.

[Basejump]

Using 3050`s with supplied rubbers and middle size servo disc.
Push servo straight into plastic frame recess.
If i mount balls on inside OR outside of servo disc the linkage rods are way off line.
Not paralell to frame.IT WILL WORK just does look ideal.
I have seen Finless vid and the linkages on his look paralell to frame.
I just wondered if the offset of output shaft is doing it.
All i can think of is making some spacers to move servo.
The ideal would be balls on outside of disc but this causes the linkages to flair out.
Wish i could get some pictures posted.

[skydude]

The ideal would be balls on outside of disc but this causes the linkages to flair out.


And if you put them on the inside they angle inward?

Sounds like your output shaft is longer than usual, as long as everything is correct. Have the horn down all the way etc. Sounds funny though. Check servo dimension specs against other servos etc.

Servos are setting all the way in the pocket?

If everything is as it should be just put balls on inside and shim (washers or such) body of servo out to proper alignment.

[Basejump]

If i put the servo`s in the aperture as normal with just rubber grommets,linkage alignment is off with balls on inside OR outside of disc.
I have just compared the 3050 with a 3001 and 9254.
The 3050 has a longer output shaft position, just my luck. 3001 and 9254 and 9252 are all the same.
Made some spacers up last night and all links are now paralell to frame BUT with the balls on the inside of disc the bolts for the balls are hitting servo case!!!!!
I am going to have to get different servo`s.
What servo fits perfectly?
I have 2 hitec 6965`s but the servo case holes to not line up with frame.

[Happy|Harry]

if you have it lined up ok with your spacers get some of these ball links here>> Flush Ball Links (http://www.helidirect.com/product_info.php?cPath=322&products_id=5885) these have the bolt sit inside the ball so they wont hit the servo case :)

or if your set on different servos the JR/Spektrum DS821's are good value digitals with a set of 3 available for $60 >> DS821 - $20ea (http://www.espritmodel.com/browseproducts/JR-DS821.html) or you could go with the old favourite futaba S9252's or even S3152's :)

[Mikej]

Basejump / Murph,

I suggested this on RR, but here goes again in case it helps anyone else .....

Trex 600s have balls (same size) with various lengths of "stand-off" - pop into your LHS and get a bag - you will probably find that they will solve your problem.

Cheers,
Mike.

[Pinecone]

You can find the DS821s for as low at $60 for 4 of them in the classified sections. People sell them out of DX7 kits.

And the neat thing is, the JR Large servo wheels have holes drilled that eactly match both offset and non-offset setups. :)

[bjosko]

You can find the DS821s for as low at $60 for 4 of them in the classified sections. People sell them out of DX7 kits.

And the neat thing is, the JR Large servo wheels have holes drilled that eactly match both offset and non-offset setups. :)

I have just finished installing the DS821 (from my DX7 Kit) in my CF frame, and they fit perfectly. I also had the same problem as Basejump with the Maxwell-servos my Hurri was delivered with (as a Kit from Flying Hobby).
They are not so fast as the Maxwells, but for my flying skill right now, I think they will be OK.

I would try to upload a picture of my old setup, so you can see what I think he has a problem with.

[bjosko]

I think this show his problem ?

[Basejump]

bjosko, That is it exactly.It all works BUT it dont look pretty.

[rjarois]

basejump, just put the servo linkage balls to the inside...ya get a straighter linkage.

[Basejump]

Yes, but you are not using 3050`s.The output shaft on these is out further.
I have made spacers and it is looking ok so far.
Using 3050`s it takes a spacer of 4mm and then balls on inside of disc to get a straight run.