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Graupner Koala-Bell 230-Elektro Skaler > Uni 60 Rotor Head - is something missing
 
 
Thumbpilot
Senior Heliman
Location: Navan, Ireland

I just bought a Uni 60 second hand and noticed that on the rotor head, directly below the blade grips there are two brass threaded holes (one on each side). What are these for? Am I missing a critical part of the rotor head?

I've seen pictures of other Uni 60s and they don't have these holes. They are not on the manuals either.

I believe I've got a '98 version.

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08-30-2004 Over year old.
 
 
Thumbpilot
Senior Heliman
Location: Navan, Ireland

Bump!

Anyone?

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08-31-2004 Over year old.
 
 
zapa
Heliman
Location: Prague, Czech Republic, Europe

UNI 60

Hi,
I have UNI 60 (UNI Expert 98) mechanik in my BO-105. You can have a look at pictures such as http://zapa.aeroomni.com/modely/uni60/stavba/v5.jpg. or http://zapa.aeroomni.com/modely/uni60/stavba/v7.jpg If you need any advice, please let me know, but actually I am not sure what are you talking about ...

Send me a picture of that part, or ask and I will send you a more detailed picture of the head as well as a picture of the assembly ...

Best Regards
Pavel
09-02-2004 Over year old.
 
 
Thumbpilot
Senior Heliman
Location: Navan, Ireland

Picture sent

[color=green][/color]
09-02-2004 Over year old.
 
 
Thumbpilot
Senior Heliman
Location: Navan, Ireland

I've discovered it is a head from a UNI Profi mechanics, pn# 4607/26

I dont have the two M3x10 bolts that go into the bottom of the head. Still wondering what these bolts do and are they necessary. Maybe they control the amount of head flap???

Kinda quiet here on the Graupner Forum.

I've flown the heli and it is very stable in a hover but a bit wild in FF.

Anyone flying a Uni 60 with a 9CHP that wants to share their setup info? Especially the percentage settings on the Swash AFR for Ail, Elv and Pit

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09-06-2004 Over year old.
 
 
zapa
Heliman
Location: Prague, Czech Republic, Europe

... did not get any pictures ... (

Never mind, these bolts are not on EVERY head - my friend has UNI Expert, but without it as well.
09-08-2004 Over year old.
 
 
the collective
Veteran
Location: Bayside, NY, U.S.A

Are the two threaded holes down near the bottom of the rotor hub, below the level of the jesus bolt? I remember the older Heim rotor heads had a pair of holes down near the bottom of the head which were used to adjust the static tracking.
09-08-2004 Over year old.
 
 
Thumbpilot
Senior Heliman
Location: Navan, Ireland

Zapa, not sure why you did not get the pic - I sent it to the email address from your web page. You are right - most of the newer heads do not have bolts (or bolt holes). I seem to have a head from an older Profi mechanics on a UNI expert 98.

the collective - yes the bolt holes are near the bottom of the head. What difference will it make if I put bolts in and how tight should they be. Or do I not bother?

Any one have a link or a pdf on setting this up. I've currently got -5 to +10 and the heli is very stable in a hover. I wonder will putting bolts in the head help with FF.

[color=green][/color]
09-08-2004 Over year old.
 
 
zapa
Heliman
Location: Prague, Czech Republic, Europe

Hi,
I ha ve a manual for that, but just i German do, I am not sure to catch all details. I have used these bolts in quitesimple way. I have put the complete machine on the table and mark the position of one blade tip(the distance from the table desk). Afterward I turn rotor 180 degrees and check the distance again - it should be equal. If not play with bolts. How tight ? I can't provide you some numbers in Nm, but use a "reasonable" power ...

I think bolts are not so important, it is just fine tuning of static tracking, that's all. Overall UNI Expert is solid rock mechanics suitable for the semiscales. -5/+10 is fine and with O.S. 61 WRC-HGL and light body it is a perfect combination.

Pavel

PS: I have check the mail, it is working, but no picture anyway - please resend it, it could be captured by the anti-spam software (
09-09-2004 Over year old.
 
 
the collective
Veteran
Location: Bayside, NY, U.S.A

Quote 
the collective - yes the bolt holes are near the bottom of the head. What difference will it make if I put bolts in and how tight should they be. Or do I not bother?


If the hub fits snug to the mainmast you don't really need to worry about those bolts. If the fit is a bit loose and the hub can wiggle at all on the shaft then intall a bolt in each hole and run them in until they lightly touch the mainmast on each side. That gets the wobble out.

Now install a set of blades on the head and measure up from the tailboom to each blade. If the measurements are different you'd loosen the screw on the high blade side a quarter turn and snug the screw on the low side in a quarter turn. Measure again. Repeat until both blades are the same height above the boom and your static tracking is done.

If the hub is snug and you go without the screws, check the fit after several gallons worth of flight. If any looseness has developed, installing the screws will eliminate it.
09-09-2004 Over year old.
 
 
Thumbpilot
Senior Heliman
Location: Navan, Ireland

zappa & the collective

Thank you both very much - you have "solved" my problem. Your help is very much appreciated.

PS. zapa - I sent the photo to try and describe which bolts I was referring to, no need to resend as you fully understand what I was talking about.

Thanks guys

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09-09-2004 Over year old.
 
 
heli_headcase
Key Veteran
Location: Hovering around Atlanta

One last thing...

The static tracking screws should be locked into the brass inserts by first threading a nyloc nut onto the M3 bolt. Very little force is needed to obtain perfect static tracking - too little to reliably secure the bolts/screws. Gently tighten the nut after tracking is done and nothing will change. Thread-lock juice isn't needed here.

FYI: Miniature Aircraft offered a similar adjustment on their plastic block X-Cell heads. Some were quite loose on the shaft.

A tip: Be sure the feathering spindle is comfortably settled in the damper O-rings before measuring the tip tracking otherwise you're wasting your time.


HHC

So many heli's - too little time...
11-02-2004 Over year old.
 
 
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Graupner Koala-Bell 230-Elektro Skaler > Uni 60 Rotor Head - is something missing
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