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Help Please!!

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jonsmitheuropa(at)tiscali
Guest

Posted: Tue Oct 13, 2009 11:51 pm Post subject: Help Please!!

Hi, I'm just on the last stage of completing the mods 52 and 74, (weight increase and wing pin etc..) which is making the spar strap.



I've laid up the spar strap which seems to have gone well but - you've guessed it - I can't get the wings apart again! 



I was wondering if anyone has any tips for doing this.  It does say in the instructions that a "scissor jack" may be needed, so I'd guessed it was going to be tricky!   Is this a car type jack and if so, where is the best place to use it?  I don't want to destroy anything!  Bear in mind the wings are fully complete with root fairings etc.



Cheers, Jon

G-TERN, classic mono.

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frans(at)paardnatuurlijk.
Guest

Posted: Wed Oct 14, 2009 12:22 am Post subject: Help Please!!

JonSmith wrote:



 	  Quote: 	
		   I've laid up the spar strap which seems to have gone well but -

 you've guessed it - I can't get the wings apart again!


	


I would try it with a high-lift-jack, as commenly used by off-roaders:

http://www.vislandrovers.nl/extra/HighLiftJacks.php



These "clamp" can get far apart enough to clamp over the ends of the

wing spars, and they can be configured either to move outwards (like

lifting a car) or compressing (like you need to force the wing spar to

slide out of the strap).



If this doesn't work, you can try to heat up the connection between both

wing spars.



If nothing helps, you can always take the spar strap apart again, clean

up the mess, and after releasing the wings, build the strap again from

scratch....



Frans

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

Posted: Wed Oct 14, 2009 12:54 am Post subject: Help Please!!

Hi! Jon

Hopefully you have done the spar strap/cuff with the wings pinned together

away from the aircraft ?

If so I would apply a small amount of heat round the cuff, but not where it

is bonded to the spar, whilst giving some sharp pulls to part the wings.

If the wings are fitted to the aircraft then I don't profess to have an

answer other than some sharp pulling shocks (with the pins out!) I'm

sceptical about the Sissor Jack idea other than again only with the wings

detached and jacking two pins apart which are only engaged in each wing

separately and that would involve some device being made since the jack

would have to engage on a pin either side of the assembly simultaneously.

Regards

Bob Harrison G-PTAG



--

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Ivor Phillips

Joined: 16 Jan 2006
Posts: 253
Location: London UK

Posted: Wed Oct 14, 2009 1:21 am Post subject: Help Please!!

You could use a long sash clamp diagonally across the spar ends, with a very small amount of heat if needed,

http://www.technologystudent.com/equip1/sash1.htm

best of luck

ivor

---- Frans Veldman <frans(at)paardnatuurlijk.nl> wrote: 

 	  Quote: 	
		   

 

 JonSmith wrote:

 

 > I've laid up the spar strap which seems to have gone well but -

 > you've guessed it - I can't get the wings apart again!

 

 I would try it with a high-lift-jack, as commenly used by off-roaders:

 http://www.vislandrovers.nl/extra/HighLiftJacks.php

 

 These "clamp" can get far apart enough to clamp over the ends of the

 wing spars, and they can be configured either to move outwards (like

 lifting a car) or compressing (like you need to force the wing spar to

 slide out of the strap).

 

 If this doesn't work, you can try to heat up the connection between both

 wing spars.

 

 If nothing helps, you can always take the spar strap apart again, clean

 up the mess, and after releasing the wings, build the strap again from

 scratch....

 

 Frans

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jonsmitheuropa(at)tiscali
Guest

Posted: Wed Oct 14, 2009 5:55 am Post subject: Help Please!!

Thanks for the suggestions everyone.  I'm going to have another go tonight with a little heat and effort to start with!!  Yes (Bob) the wings are pinned together OFF the aircraft, but the only difficulty with using jacks etc on the spar ends is that the rigging cup is bonded on the port wing thus the stbd wing's spar tip is hidden within!!

Cheers, Jon

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frans(at)paardnatuurlijk.
Guest

Posted: Wed Oct 14, 2009 8:14 am Post subject: Help Please!!

JonSmith wrote:

 	  Quote: 	
		   

 <jonsmitheuropa(at)tiscali.co.uk>

 

 Thanks for the suggestions everyone.  I'm going to have another go

 tonight with a little heat and effort to start with!!  Yes (Bob) the

 wings are pinned together OFF the aircraft, but the only difficulty

 with using jacks etc on the spar ends is that the rigging cup is

 bonded on the port wing thus the stbd wing's spar tip is hidden

 within!! Cheers, Jon


	


You could drill a large hole through the rigging cup so you can use a

bolt as a push rod. Heating the cup and temporarily removing it is

another non-critical thing you could do.



Succes!

Frans

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budyerly(at)msn.com
Guest

Posted: Wed Oct 14, 2009 9:56 am Post subject: Help Please!!

<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]-->  Jon,

 I've done a number of these spar straps and all had to be disengaged alone  by me in the shop before the guys arrive.  

  

 Once cured, I use a long putty knife (flat blade scraper of about .025  inches) and slide it between the release tape and the glass strap.  

  

 When visually I see I have air around the contact points on the aft side  top and bottom, then I wiggle them.

  

 I pull the pins out with the wings properly supported by saw horses or  suitable supports.  Normally I have saw horses midway down the wing and  both spars pinned.  When ready to remove I support the mid point with a low  saw horse or tool stand shimmed up to give support and make removal of the pins  uneventful.

  

 I find that the removal of the pins and a slight up and down movement of  the wings clears any stubborn corners I couldn't get to release.

  

 Lastly, I don't use a jack, but my back against one root side and  my foot against the other rib (properly padded if the wing fillets are on) and  push.  I never had it fail me, but now that I am older, I have one of the  guys help me push as I don't have the flexibility I used to have.

  

 A good jack is your auto screw jack with a properly sized piece of lumber  to join together between the ribs and light pressure is all that is  needed...

  

 Bud Yerly

 Custom Flight Creations

 [quote]   ---

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jonsmitheuropa(at)tiscali
Guest

Posted: Thu Oct 15, 2009 3:24 am Post subject: Help Please!!

Thanks for all the advice everyone - I now have two wings again instead of one big one!!  Bud's advice about the putty knife (many thanks) plus a little heating and lots of swearing and grunting seemed to do the trick!

Cheers Jon

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