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Graupner Koala-Bell 230-Elektro Skaler > Uni-Expert Pitch Adjustment
 
 
blackhawk_UK
Heliman
Location: Wilts - UK

Hi,

I'm building some uni-expert mechs, and i'm having trouble getting the pitch range set up (page 28 of the manual).

The manual says that when sliding the swash up as far as it will go, the swashplate should rest against the compensator, and the compensator should rest against the underside of the rotor head.

The manual covers what to do if this is not the case, but it only says what corrections should be made if there is a gap between the swash and the compensator, OR a gap between the compensator and the rotor head. My problem is that I have a gap between BOTH !

I have adjusted the angled rods so that the swash rests against the compensator, but there is still a gap between the compensator and the rotor head. The manuals advice for this would mean that I undo the adjustments that I have already made to get this far !

Any ideas as to what I'm doing wrong ?

I bet its something really simple, and I'm going to look really stupid ....again !!

06-23-2005 Over year old.
 
 
blackhawk_UK
Heliman
Location: Wilts - UK

Is there anyone out there that can help with this ?

Please ????!!!!!!!
06-24-2005 Over year old.
 
 
Heimypilot
Heliman
Location: Hengelo Netherlands

Hello,

It looks like an impossible story. I checked my helias rotorheads and found not even a possibility for any part to run against something before the swash and pitch-comp. are in the most upper position. Maybe you should post a foto of the upper and lower position so we (I) can visually check.

My best guess is that it runs stuck on any other part or maybe a scratch on the mast. Else I think no-one will know....

Steven
06-27-2005 Over year old.
HOMEPAGE  
 
 
blackhawk_UK
Heliman
Location: Wilts - UK

SOMEONE REPLIED !!!

THANKYOU !!

OK. Heres a pic



I have moved the swash all the way up (after disconnecting the servo rods), and as you can see I still have a gap between the pitch compensator, and the rotor head.

I have adjused the angled rods to decrease the gap between the swash and compensator, but I am lost as to how I can now decrease the gap between the compensator and the rotor head !

This is driving me nuts ....
06-28-2005 Over year old.
 
 
Heimypilot
Heliman
Location: Hengelo Netherlands

Please put a (ore more) hi-res picture in my mailbox. (hotmail has now 25 Mb)
As far as I can see on this small pic. you'll have to shorten the angled rods even further more.
I'll get my uni star out of the box and make some pic's too of the rotorhead. I guess we'll find out what's wrong.........

Steven
06-28-2005 Over year old.
HOMEPAGE  
 
 
Heimypilot
Heliman
Location: Hengelo Netherlands

Well am I stupid. I just found out clicking the small image makes it big.

Up is a pic of my uni star head but I mounted a Vario centerpiece. However I took the original centerpiece out of the box and the Pitch Compensator neatly slides between the metal pins and bumps onto the centrepiece.
So here I think we go from:
1. Take the angled rods off at the flybar
2. slide the swash an P.C. all the way up.
3. Hold it there , an hold the flybar horizontal.
4. Adjust the angled rods until they are just in front off the ballends on the flybarbridge.
5. now you should be able to put them back on without moving the swash and P.C.

steven
06-28-2005 Over year old.
HOMEPAGE  
 
 
blackhawk_UK
Heliman
Location: Wilts - UK

Steven,

I was just about to fill up your mailbox with hi-res images of the rotor head !!

I give it a go, and let you know how I get on.

Thanks for spending the time helping me with this.
06-28-2005 Over year old.
 
 
Heimypilot
Heliman
Location: Hengelo Netherlands

Guess my pic won't show up
If you need it just yell.

good luck
06-28-2005 Over year old.
HOMEPAGE  
 
 
blackhawk_UK
Heliman
Location: Wilts - UK

Steven,

Just had another look at it, and realised that there is no way i'll decrease the gap as the 2 guide pins (that go from the head block) are touching the swash plate when the swash is pushed up all the way.



The other way of looking at this problem is like this .....

The pitch range I am getting is -5 to +15 (!!!)

How can I decrease the positive pitch (to something like +12) and get something like -8 on the negative.

Does this make things any more clear ????
06-28-2005 Over year old.
 
 
Heimypilot
Heliman
Location: Hengelo Netherlands

It's all clear to me,
I checked my rotorhead : The two pins don't touch my swashplate. they end in the gap of the swash. maybe they're not all the way in the centrepiece. The pins measure 2.00 cm out of the centrepiece.
However tilting the swach is limited in the utmost upper position.

Unfortunately the pitchrange of the Heim rotorheads are somewhat limited. I guess 20 degrees total is the most you can get. To shift the outer limits trim the rods which control the blades.
1. I always start by putting the stick in the middle pos.
2. Then I determine what I want as central pos. +5 or 0 degrees.
3. Trim the servo's in the mid pos.
4. put the swash in the mid pos. and adjust the rods from servo to swash
5. adjust the blade rods to obtain +5 or 0 degrees on the blades.(whatever I determined to)

I hope this makes any sense to you. I just might write some foreighn Dutch in between.

Steven
06-30-2005 Over year old.
HOMEPAGE  
 
 
Heimypilot
Heliman
Location: Hengelo Netherlands

Hey, I just took another look at your picture. Here's the difference:
You have a metal swash an I have the plastic one. The manual probably also assumes you have a plastic one.

Steven.
06-30-2005 Over year old.
HOMEPAGE  
 
 
blackhawk_UK
Heliman
Location: Wilts - UK

Hi Steven,

Yes, you are correct about the metal swash !!

The stock plastic swash has a kind of recess right below where the pins from the rotor head come down. The metal swash does not have this recess, and the pins end up touching the swash at the highest position. I double checked the length of the pins, and they match yours (2.00 cm). I guess its just the way the metal swash is

I've just spent a bit of time adjusting the rods, as in your instructions, and I now have a pitch range of about -6 to + 13 (or thereabouts !).


Thanks for spending your time helping me with this. Its greatly appreciated. Its been driving me nuts !!

Thanks.
06-30-2005 Over year old.
 
 
Heimypilot
Heliman
Location: Hengelo Netherlands

Any time again.........

steven
07-01-2005 Over year old.
HOMEPAGE  
 
 
cuckoospringer
Senior Heliman
Location: Marietta Ohio

I am haveing the same problem. I have a metal swash and it hits the pins. Would it work to shorten the pins a little to compensate. At present I am only getting +9 and -6.

Doug Thomas
07-03-2005 Over year old.
 
 
blackhawk_UK
Heliman
Location: Wilts - UK

Cuckoospringer

I would NOT shorten the pins. If you do, they will no longer guide the pitch compensator at negative pitch. You should have 2.00 cm of pin coming out from the rotor head.

As you can see from the length of this thread, it took me a while to get it, but I got there in the end.

Follow Heimypilot's instructions on this thread and you should be OK.
07-03-2005 Over year old.
 
 
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Graupner Koala-Bell 230-Elektro Skaler > Uni-Expert Pitch Adjustment
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