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Wing dolley - where to put the pivot point

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alan_milner(at)totalise.c
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Posted: Mon Mar 24, 2008 4:48 am Post subject: Wing dolley - where to put the pivot point

I had hoped for an Easter weekend in Cornwall, but with snow, rain, gales and generally miserable weather I thought I'd make up some wing dolleys to aid self rigging.  



I've pretty much copied the design used by many; essentially two layups clamped around the tip, hinged on the underside and supported by a two wheeled metal frame the pivots to allow the wing to move from vertical to horizontal.  The layups are curing now in this tropical heat so they should be ready by next Easter 



Anyone who has been using a similar design, can you suggest where to put the pivot point for a trigear wing?  I planned to balance it so it's slightly leading-edge heavy.  It would then fall to the vertical for storage and when wheeling it around.



Any comments from experience most welcome.  I haven't built the frame yet.



Alan

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ptag.dev(at)tiscali.co.uk
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Posted: Mon Mar 24, 2008 7:18 am Post subject: Wing dolley - where to put the pivot point

Hi! Alan

I mused about this problem when I built my wing dolly and also since

having used it often. However when I rig with a helper, who initially

handles the tip, when I take over the tip end from him having engaged

the spar, I lift the tip trailing edge with one hand until he is out of

the way, so my thoughts are that the tip end C of G is in fact behind

the trailing edge (in fresh air!) when the root end of the wing is

supported  by the spar.

In other words you can not make the dolly to fit the C of G. I plumped

for approx. mid chord for the pivot.

Regards

Bob Harrison G-PTAG



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alan_milner(at)totalise.c
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Posted: Wed Mar 26, 2008 2:53 pm Post subject: Wing dolley - where to put the pivot point

Thanks Bob



I'll go for the same point then. 



Did you do anything to the spar to allow it to slide better over the tufnol, eg a strip of ptfe?



Alan

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

Posted: Wed Mar 26, 2008 4:03 pm Post subject: Wing dolley - where to put the pivot point

Hi! Again Alan

I missed your question but have picked up your thread from the System

notification.

The tufnel slide has a step in it to keep the spa aligned but also it is

a little rounded.

My best aid is the ramps I welded on the starboard socket since provided

the port tip is directed aft wards (therefore keeping the spa tight to

the starboard seat back) the port spa has to engage the socket since the

ramps automatically guide the spa tip home to the socket.

I think the pictures are still on John Cliffs web page

http://www.crix.org.uk ....under G-PTAG "Rigging aids" But they are

lousey photos!

Regards

Bob Harrison G-PTAG



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karelvranken(at)hotmail.c
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Posted: Thu Mar 27, 2008 1:54 pm Post subject: Wing dolley - where to put the pivot point

Bob,

Your lousey photos are non figuratif artefacts and it doesn't matter if we 

don't understand what you mean.

Best regards,

Karel Vranken.

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ptag.dev(at)tiscali.co.uk
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Posted: Fri Mar 28, 2008 12:48 am Post subject: Wing dolley - where to put the pivot point

Karel, Seriously now! Do you need a better description ?

Regards

Bob H 

Do not archive.



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