[MHml] [jordan drogue

[Peter Southwood]

That is another thing entirely, and at this stage I see no obvious reason why it shouldnt work.. It may be a bit of an awkward thing to handle, and if large enough, each cone will probably need reinforcing around the edge. 
You may need slightly more total frontal area because the further cones will be in the wake of the nearer ones, but if it works as a true sea anchor, ie the speed is very low, this may not be a significant effect. 
Try one and let us know, I think it would be a good experiment. As a first estimate I would suggest keeping the length the same as that recommended for the Jordan drogue for the vessel size, but with combined frontal area about equal to that for a parachute anchor for the same boat. The distance between cones would probably scale with the cone diameter.
Cheers,
Peter
  ----- Original Message ----- 
  From: rob dalton 
  To: Informed discussion of multihull issues 
  Sent: Wednesday, November 22, 2006 1:19 AM
  Subject: Re: [MHml] [jordan drogue


  No argument with this, but was considering a separate, larger-diameter Jordan-style drogue instead of a sea anchor.
   Robert

  Peter Southwood <peter.southwood at telkomsa.net> wrote:
    Hi Rob,
     As I understand it the length is important to keep the line immersed and in unbroken water at all times. If it is shortened too much it may fail. 
    Cheers,
    Peter
      ----- Original Message ----- 
      From: rob dalton 
      To: Informed discussion of multihull issues 
      Sent: Tuesday, November 21, 2006 6:40 AM
      Subject: Re: [MHml] [jordan drogue


        I was tawling through the archives and came up wit the discussion of Jordan drogues and parachutes, wher someone suggested using a Jordan drogue as the line to tether the chute. It makes  sense to me except that the drogue would have to be retrieved before the chute could be deployed.
         I was wondering about the optimum size of drogue. The present size on a Jordan drogue seems to work but I couldn't see any work done on optimising the diameter. They seemed to have a guess that worked and left it at that. If the dorgues were larger, then the length of line needed would be less. Double the diameter, halve the number and you double the area. Possibly a series of larger drogues could take the place of a parachute if the drogues were sufficiently large, removing the problems of deflating with waves and damping down yawing,
         Robert

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