From:	mielse@euronet.nl (Emiel Stroeve)
Subject: Drawing a crossbridle
Date:	Mon, 22 Apr 1996 20:13:04 -1000
Organization: Euronet Internet
Message-ID: <4lhsdg$ng9@news.euro.net>

Hi all,

When designing a crossbridle it's always hard to see how the foil
actually is shaped when flying.  After designing a crossbridle I end
up with the length of all the secundary bridle lines.  The length of
the primary bridle lines are known (b-line is allways the same length)
and the witdh of the cells is known.

With these ingredients I want to draw the crossbridle with the
attached foil before knotting it to the foil, so I can see the shape
of the foil with the designed crossbridle and start designing a better
one or knotting it to the foil, wichever applies.  

I now math, but I don't succeed in drawing the crossbridle with the
attached foil in a CAD program.  F.i. the distance between the two tow
points is unknown, even when I actually fly one I can change this and
therefor I change the shape.  

thanx,

Emiel



                                                    
Emiel Stroeve             The Netherlands              
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E-mail: miel@knoware.nl                         



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From:	Mark Shelley <mshelley@horeb.demon.co.uk>
Subject: Re: Drawing a crossbridle
Date:	Fri, 26 Apr 1996 12:48:34 -1000
Organization: Home
Message-ID: <830558914snz@horeb.demon.co.uk>

In article <4lhsdg$ng9@news.euro.net> miel@knoware.nl "Emiel Stroeve" writes:
 
> When designing a crossbridle it's always hard to see how the foil
> actually is shaped when flying.  

> I now math, but I don't succeed in drawing the crossbridle with the
> attached foil in a CAD program.  F.i. the distance between the two tow
> points is unknown, even when I actually fly one I can change this and
> therefor I change the shape.  
> 

I'd also like to know the answer to this.

>From the crossbridle dimensions I've used a spreadsheet to draw the 
shape of the foil when flying - but it needs the distance between the 
tow points as an input variable.  This distance makes a crucial 
difference to the foil shape.  But how do I calculate it?  If it
changes in flight then obviously the foil shape changes.  I suppose
it could be done if the tension in each line of the crossbridle were
known, but I don't have the aeronautics knowledge to do this!

-- 
Mark



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