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Tailplane torque tube bushing question

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georgepowell(at)hotmail.c
Guest

Posted: Sun Sep 16, 2007 8:15 pm Post subject: Tailplane torque tube bushing question

I purchased an XS kit in 2003 and never got my Accelerated Stage I kit, due to the collapse of EMIL.  Later, I purchased the tailplanes already built from a charity that got them from someone's estate.  The torque tube TP4 is extremely tight when I try to put the tailplanes on, and it is nearly impossible to get the TP4 to seat properly in the TP6 sleeve already bonded into the tailplanes (the TP12 pins will not seat into the TP13 bushes, due to the difficulty in getting the torque tube in).  If I can't get the tailplanes on in my shop, I certainly won't be able to get them on the completed airplane.   



It appears I have 2 choices:  cut into the tailplanes and remove/reseat the TP6 sleeve, or build new tailplanes.



How difficult a task is it to unbond the TP6 bushing and reseat it, making sure the TP4 fits properly and does not bind?  If I go this route, what is the best course to take?



Any suggestions would be greatly appreciated.



George Powell

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fklein(at)orcasonline.com
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Posted: Sun Sep 16, 2007 8:56 pm Post subject: Tailplane torque tube bushing question

On Sunday, September 16, 2007, at 09:14  PM, G&amp;TPowell wrote:



 	  Quote: 	
		   

 <georgepowell(at)hotmail.com>


	


 	  Quote: 	
		   The torque tube TP4 is extremely tight when I try to put the 

 tailplanes on, and it is nearly impossible to get the TP4 to seat 

 properly in the TP6 sleeve already bonded into the tailplanes (the 

 TP12 pins will not seat into the TP13 bushes, due to the difficulty in 

 getting the torque tube in).


	


George,



I had the same extremely tight fit and found that a liberal coating of 

vaseline on the tube did wonders.



Fred

A193

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ptag.dev(at)tiscali.co.uk
Guest

Posted: Sun Sep 16, 2007 9:16 pm Post subject: Tailplane torque tube bushing question

Hi! Fred

Vasiline is too viscus try very light oil.

Bob H G-PTAG



Robt.C.Harrison

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hurstkr(at)redzone.com.au
Guest

Posted: Mon Sep 17, 2007 12:39 am Post subject: Tailplane torque tube bushing question

George,



I take it that the TP5 sleeve (at the root end of the tailplane) slides 

easily along the torque tube TP4 until the torque tube begins to enter TP6 

(the sleeve with the pip pin hole).



As I see it,  there is more than one scenario that could cause this.



1    The TP5 sleeve could be slightly out of alignment causing the torque 

tube not to want to enter TP6.  On forcing the alignment during rigging, TP5 

would then bind on the torque tube and jam.



2    TP6 may be slightly out of alignment which would cause it to bind as 

the torque tube enters it.



3    There may be a slight film of epoxy or similar on the inside of TP6



4    TP6 may have been shrunk.  This can happen if grooves were ground 

around its periphery to enable better bonding (the heat causes the sleeve to 

shrink -  Ask me how I know this !)



5    Any combination of the above.



If TP5 is tight all the way along TP4, either 3 or 4 above may apply ??  If 

TP5  IS  indeed tight all the way, will the tailplane fit on the wrong end 

of TP4 torque tube ?



I think it is important to properly identify the problem before trying to 

determine a fix.



Good luck

Kingsley in Oz.

 	  Quote: 	
		   I purchased an XS kit in 2003 and never got my Accelerated Stage I kit, 

 due to the collapse of EMIL.  Later, I purchased the tailplanes already 

 built from a charity that got them from someone's estate.  The torque tube 

 TP4 is extremely tight when I try to put the tailplanes on, and it is 

 nearly impossible to get the TP4 to seat properly in the TP6 sleeve 

 already bonded into the tailplanes (the TP12 pins will not seat into the 

 TP13 bushes, due to the difficulty in getting the torque tube in).  If I 

 can't get the tailplanes on in my shop, I certainly won't be able to get 

 them on the completed airplane.

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georgepowell(at)hotmail.c
Guest

Posted: Mon Sep 17, 2007 6:20 am Post subject: Tailplane torque tube bushing question

Thanks to all for the replies.  



To answer the points raised, I did lubricate TP4, but with Teflon white lithium grease, as I saw suggested on another thread.  This helped some, but not much.  The TP4 does slide through TP5, but not very easily on one side.



I did check for epoxy contamination; I believe that both TP5 and TP6 are clean.  I opened up the bottom of the tailplane to check the integrity of the TP6 join, and I found that a few blobs of epoxy had dripped between the joints of the foam in the empty foam tube area between TP5 and TP6.  I thought that these might be binding the TP4 as it passed through.  Removing these little blobs helped a little.



With the bottom of the tailplane open, I can easily see the TP4 when it reaches TP6.  The serious binding begins when TP4 enters TP6.  



The points raised by Kingsley seem possible, if not probable.  As I did not construct these tailplanes, I don't know how well they were made when the TP5 and TP6 sleeves were set.  It seems entirely possible that one or the other (or both) are not in alignment.  From visual inspection of the TP6 it does not appear that grooves were cut in it to "key" the epoxy bond, so I don't think that would have contributed to TP6 "shrinking".  



I am glad I opened up the bottom to check this, as I will now roughen the surface of TP6 with a dremel or drill when doing the layup described in Service Bulletin 006.



If I have to remove TP6 (and/or TP5) to reset them, what is the proper technique to do so?  



Your suggestions are greatly appreciated.



George Powell

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jrgowing(at)bigpond.net.a
Guest

Posted: Mon Sep 17, 2007 12:49 pm Post subject: Tailplane torque tube bushing question

And Kingsley and George

If one of the bushes are out of line, only tightening when the second is 

mounted on the tube - then a  heat cure while mounted might free them by 

letting them go into alignment?

JR (bob) Gowing also in Oz



do not archive

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ptiller(at)lolacars.com
Guest

Posted: Tue Sep 18, 2007 12:56 am Post subject: Tailplane torque tube bushing question

Hi George,



I have the same problem as I am repairing a crash damaged Europa.  I have tailplanes from a Classic Europa and a new XS fuselage and torque tube.  



To cut a long story short, the XS torque tubes and bushes are ground to a tolerance specified by a drawing whereas the Classic tubes and bushes were ground down to match each other but not necessarily to a known size.



I need to do exactly what you are proposing which is to extract the old bushes and replace them with new ones that came with my XS torque tube.



Neville Eyre was going to write a procedure for me a few months ago but he never got round to doing this and I never got round to chasing him up.  I suggest we both contact him and ask nicely if he can write this procedure up.  He tells me it is quite easy to do although will require cutting into the lower surface of the tailplanes.



Regards,



Phil

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