Date:	Mon, 16 Jan 1995 04:12:41 -1000
From:	andrewh@phoenix.harvard.edu (Mark Johnson)
Message-Id: <3fdusp$nlp@epsilon.qmw.ac.uk>
Organization: Queen Mary & Westfield College, London, UK
Subject: Re: Bar/Quad Deadman

Mark Johnson (andrewh@phoenix) wrote:
: After the recent discussion a control bar as a multiplier, 
No He DIDNT.  I DID.  ITS ME!  HELP.

I seem to have become (temporarily via computer induced dna transplant)
Mark Johnson.  I am Andrew Hawken. a.hawken@qmw.ac.uk. Honest!  Mark
doesn't even fly kites (although he did go paragliding once!)

Andy HAWKEN not Mark Johnson
--
____________________________Andrew Hawken______________________________
          "However many ways there may be of being alive,
     it is certain that there are vastly more ways of being dead"
                                                                R Dawkins.
	Home  :	0895 420110		QMW   :	071 975 5542
	AIIT  :	0494 677045		Email :	A.Hawken@QMW.AC.UK


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Date:	Mon, 16 Jan 1995 01:50:38 -1000
From:	andrewh@phoenix.harvard.edu (Mark Johnson)
Message-Id: <3fdmie$94a@epsilon.qmw.ac.uk>
Organization: Queen Mary & Westfield College, London, UK
Subject: Bar/Quad Deadman

After the recent discussion a control bar as a multiplier, 
I had a think about the possibilities of a dead man control bar,
and realised that a miniaturised version would be a quad deadman
handle.

Here is  a design, based on the Lynn principle.


  .                       
  . Fly line                      
  .                       
  .
  .
  .
  .        GGGGGGGGGGGGGGGGGGGGGG
  .      _ GGGGGGGGGGGGGGGGGGGGGG
  .     // --Lug                    
  .    //                   
  O ......_                      
  BBB//   ||BBBBBBBBBBBBBBBBBBBBBB                 
  BBB||   //BBBBBBBBBBBBBBBBBBBBBB                  
  BBB\\__//BBBBBBBBBBBBBBBBBBBBBBB                    
  BBBB\__/ BBBBBBBBBBBBBBBBBBBBBBB                  
   
The diagram is terrible, but is supposed to represent 
one end of the bar/handle in mid release.  Let me 
explain!

The (sacrificial) line comes down through the guide at 
O, and then into a Lynn type 'trap' represented by the 
slashes.  However, instead of this being directly 
connected to a grip as in the Lynn handle, the grip on 
the lynn handle is replaced by a short lug which is 
trapped under a grip GGGG.  The diagram shows the lug
escaping to release the line.

The grip can be gently sprung towards the main bar BBBB,
and could either be free floating with a lug at each end,
or there could be two parallel grips each with a lug at one
end and a hinge at the other.

As long as the angles are gotten right between the line guide and the 
trap so that it rotates to release the line under the correct forces,
then this looks to work.

As far as possible, ignore the diagram and think "lynn handle with trapped 
lug instead of regular grip".  If this concept seems to work then
you can make the grip curved for quad handles, and as long as you like for
control bars.

Andy     
--
____________________________Andrew Hawken______________________________
          "However many ways there may be of being alive,
     it is certain that there are vastly more ways of being dead"
                                                                R Dawkins.
	Home  :	0895 420110		QMW   :	071 975 5542
	AIIT  :	0494 677045		Email :	A.Hawken@QMW.AC.UK


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