[MHml] jordan drogue

[Bill Gibbs]

The value of a Jordan Drogue is that it has been well tested as a drogue, that is a device to trail and reduce the speed of a boat
to manageable levels.  It has not been tested as a sea anchor, that is a device to hold a boat bow to wind and waves, while holding
station.  As a parachute anchor does.

 

Your idea of building a sea anchor from a Jordon Drogue concept is interesting, but way over my ability to know how successful it
will be.  Nothing I'd want to bet my life on.

 

But if I had to guess, I'd guess that the Jordon cones quickly lose strength and stiffness as they increase in size.  I'd also guess
that a Jordon drogue would need a hell of an area increase to move up to sea anchor from it's current drogue status.

 

Bill

 

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From: multihulls-bounces at steamradio.com [mailto:multihulls-bounces at steamradio.com] On Behalf Of rob dalton
Sent: Tuesday, November 21, 2006 3:19 PM
To: Informed discussion of multihull issues
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 <mailto:cateran1949 at yahoo.co.uk>  dalton 

To: Informed <mailto:multihulls at steamradio.com>  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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