700N DFC How do you get zero pitch with the DFC links

[malloryn]

As the title says,

How do you setup for zero pitch without having to practically unscrew the the DFC ball link off?

Setting up as per the manual ie all 90deg and the DFC ball links securely screwed on gives about -2 deg pitch.
Unscrewing the ball links to get 0 deg and they're nearly falling off.

If you try to raise the swash then you end up unscrewing the elevator link instead.


I read that longer links can be used but where to do get them from?

Also are there any other tricks?

I thought about sub-trimming the servos to give zero pitch. i,e. past the ideal 90deg setup.

Also, do Align actually build their kits??

[panosg]

You could always lengthen the links to swash plate to raise the swash a bit?

[swale]

To be honest I used longer ball links I also removed the ball li k reinforcement ring and added it to the longer ball links.

[J-S-Q]

I found the same problem. I used some threaded rod (actually some bolts with the heads dremeled off) with a lock nut to tighten it against the aluminium link. In theory it works very well but I have yet to fly it and am just slightly nervous as to whether it's a good idea to use this solution. Will the bolts hold up? Any thoughts welcome!

Here's a picture

[swale]

I found the same problem. I used some threaded rod (actually some bolts with the heads dremeled off) with a lock nut to tighten it against the aluminium link. In theory it works very well but I have yet to fly it and am just slightly nervous as to whether it's a good idea to use this solution. Will the bolts hold up? Any thoughts welcome!

Here's a picture

[ATTACH=CONFIG]59343[/ATTACH]

I dunno about that method...not so sure tbe bolt used will be strong enough

[panosg]

You could always lengthen the links to swash plate to raise the swash a bit?

Ok scrap that idea, I can see the problem with lengthen the links to swash, has an A arm so that's not possible!

Poor game by Align though!

[jayfrs]

Are you 100% sure that the elevator servo is at 90* when i first set mine up it un wound off the links almost to get it to zero pitch, but when re looked the servo was off of 90* after i adjusted the elevator servo and put the swash leveller back on to get the swash perfect again the pitch links was fine!

[Obi Wan]

I had the same problem - I wanted perfect geometry also and ended up taking off the DFC links and using the old style links which are longer. These only needed slightly unscrewing. But you are right - the geometry is wrong out of the box.

Glad to hear it was not just me :-).

[Delarado]

I had the same problem - I wanted perfect geometry also and ended up taking off the DFC links and using the old style links which are longer. These only needed slightly unscrewing. But you are right - the geometry is wrong out of the box.

Glad to hear it was not just me :-).

I second this, and ended up using a longer link. I think it either came as a spare in the 700N DFC kit or I had it spare from some of the links I have from other helis.

In any case, I definately used a different link to get the right geometry and still had to unscrew it a bit to get it right. I think In the end I also used to vbar software to adjust it, I dont think my servo is 90 degrees at 0 pitch, its been ages since I checked to be honest, I just set it up and flew it!

[swale]

Hmmm...I did use longer links on mine but they screwed in nearly all the way for a very snug fit. ....has been fine for some time now.

I just thought it was like this as i was useing vbar and never really looked into it....im sure a team mate hasnt had to do it and bes useing beast x

Longer arms job done. ..a minor issue

[moonmanflyer]

I had a similar issue, I had to also raise the swashplate up to get the head links better

[swale]

I had a similar issue, I had to also raise the swashplate up to get the head links better

How did u do it.....did you still maintain 90 degrees on arms etc? Your on beast x right?

[malloryn]

Vbar vs Beastx vs 3GX should make no difference.
It's all mechanical

As has been mentioned already, it seems the geometry had been designed wrong by Align.
You can't get 0 pitch with the servos and control arms at 90 without unscrewing the head links out to dodgy levels.

[PorscheBoy]

As a statement/question, are you sure the swash plate is dead centre of movement capability so you get the same +/- degrees (on full up/down stick movement) then the links are not long enough to get the blades at 0deg in the middle?
I appreciate I have a 550e DFC, but my ball links are screwed into the hilt to get 0deg at mid stick. Imho the only way you can prove that your swash is middle of travel for 0degs is if your max +/- degs are the same, if the links arn't then adjustable to achieve the blades at 0deg midstick that really is bad by Align (I am assuming your curves are currently set as a linear 0,25,50,75,100 if that matters at this point?) but surely this would have been raised before now? Seems like a setup issue.
Sorry if I am teaching my granny to suck eggs. I would be well interested to know the answer though.

[Obi Wan]

As a statement/question, are you sure the swash plate is dead centre of movement capability so you get the same +/- degrees (on full up/down stick movement) then the links are not long enough to get the blades at 0deg in the middle?
I appreciate I have a 550e DFC, but my ball links are screwed into the hilt to get 0deg at mid stick. Imho the only way you can prove that your swash is middle of travel for 0degs is if your max +/- degs are the same, if the links arn't then adjustable to achieve the blades at 0deg midstick that really is bad by Align (I am assuming your curves are currently set as a linear 0,25,50,75,100 if that matters at this point?) but surely this would have been raised before now? Seems like a setup issue.
Sorry if I am teaching my granny to suck eggs. I would be well interested to know the answer though.

The 550e link set up to the swash is different to that of the 700N. The elevator link is basically non adjustable and when set at 90 degrees (for perfect geometry), it sets the height of the swashplate. It is different from the 550e (where you can adjust all 3 linkages to the swashplate).

Paul