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Torque tube lubrication

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jonsmitheuropa(at)tiscali
Guest

Posted: Mon Jan 28, 2008 3:21 am Post subject: Torque tube lubrication

Hi, I'd like to ask for advice on suitable products for lubricating the tailplane torque tube where it goes through the fuselage bushes, both on initial fitting and subsequent servicing?



Mine had got quite stiff - elevator control felt fine but checking mass balancing was rather imprecise due to friction.  I'm about to reinstall it following removal for the mod 62 oversize pins and Bob harrisons (excellent) clamp mod.  During a trial fit I gave the bushes a light oiling with some 3 in 1 type oil and it was enormously improved; virtually friction free.  



Is a smear of this sort of light oil, and periodic re-application considered suitable or are there better ideas?  I think mine had been greased previously (didn't build it myself) but the grease seems to have gummed it up over time.  I know some people have built in lubricating tubes but I do not have this.



Thanks, Jon

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carl(at)flyers.freeserve.
Guest

Posted: Mon Jan 28, 2008 9:57 am Post subject: Torque tube lubrication

You may well find that that your TP12 assemblies are slightly distorted due 

to the welds. We had this problem which didnt really manifest itself until 

the lid was on after which it was too late.



Certainly using a light oil is better than using grease and seems to provide 

better lubrication especially with the tufnol bearings (eg: the roll tubes 

under the seats).



We drilled 1/4" in holes in the upper sides of most bearings (including the 

tailplane tubes) and drizzle 3 in 1 oil through these on a regular basis.



Whilst a friction free system is desirable to set the counter balance 

weights it is probably better to have some stiffness in the pitch control as 

this will provide a degree of damping in flight.



Carl Pattinson



G-LABS

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Fergus Kyle

Joined: 03 Jun 2007
Posts: 291
Location: Burlington ON Canada

Posted: Tue Jan 29, 2008 8:39 pm Post subject: torque tube lubrication

Someone may already have revealed this, but there was an archived discussion

which ended by noting that grease actually expanded the composite bearing

(after I had arraned to lubricate same) and caused expansion.

You might want to chase this up.

Cheers, ferg

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jonsmitheuropa(at)tiscali
Guest

Posted: Fri Feb 01, 2008 1:19 am Post subject: Torque tube lubrication

Thank you very much for your replies, Carl and Ferg.  Much appreciated. Oil it is then!

Cheers, Jon

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