Video of Jordan Series Drogue deployment... - Page 5 - SailNet Community

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  #41  
Old 04-11-2012
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Re: Video of Jordan Series Drogue deployment...

Steve has a padeye welded to each of his stern bollards from which he uses a chain bridle and the JSD comes off that, the bollards are welded to the hull (below decks) and doubler plated at deck. They have a great blog at *|*


Quote:
Originally Posted by Irunbird View Post
From Jordanseriesdrogue.com -

Attachments on the Hull
The hull attachments for the drogue should be as far outboard and as far aft as possible. I have no information on the ultimate strength of a typical sheet winch installation, and it would be difficult to evaluate each structure. Unfortunately, a winch is not an ideal structure, since the load is applied above the deck line and tends to overturn the winch and pull it out. The optimum attachment for the drogue is clearly a strap similar to a chainplate, bolted to the hull at the corners of the transom and extending aft with a shackle.

For a load of 14,000 lbs, a strap ľ x 2.25 x 18 inches attached with six 3/8 bolts would provide a conservative design.

A large steel cleat would be acceptable if the deck is thick solid fiberglass and a steel plate is provided underneath.
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  #42  
Old 04-11-2012
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Re: Video of Jordan Series Drogue deployment...

I don't think the separate retrieval line is a good idea. It might work if you are deploying the JSD for a quick lunch, but if left out for a while my guess is that the line would end up wrapped around the JSD anyway and when you pull it, you would still be pulling the JSD from the front, not the back. That must be why they have elaborate instructions for retrieving the JSD using winches on alternating sides. I have never used a JSD, but I am convinced that it deserves a spot in one's bag of tricks.
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  #43  
Old 04-12-2012
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Re: Video of Jordan Series Drogue deployment...

I used 4 inch sch 40 pipe for the mooring bits on Silas Crosby, ran thru a 12 inch square , 3/16th doubler plate, to a point ten inches below decks , where I welded it on a horizontal piece of plate, which was welded to the transom. You can see this bit in the bottom of the picture, next to the chock. It has a sheer strength of 90 tons.
If there was a chafe problem , one could run a short length of chain around the bit, to take it clear of the hull, where the rope would be attached.
The Silas Crosby has a single aluminium door for a main hatch , which is extremely tough and resistant to any boarding wave. She is also a centre cockpit boat, which makes her even more resistant to boarding waves.
Altho I have never cruised in a boat with a reverse transom, those who have, said they invite, and even launch a breaking wave into the cockpit. The difference between a reverse and traditionally sloped transom is around 6,000 lbs of extra buoyancy in the stern of the boat with the traditional transom. Thus, a reverse transom may be the cause of waves ending up in the cockpit.
Being a steel hull, she has a fraction the structural worries of non metal boats.
She has since rounded the horn.
On a fibreglass boat a large stainless U bolt in the corners of the transom, with huge backup plates would be the best attachment points for a drogue.
With the drogue shackled on, thru hard eyes, there would be zero chafe.
I built my own parabolic drogue from salvaged seat belts ( free) , using a large mooring ball , about 5 ft in diameter , as a mold. I stapled the webbing in the shape of a half sphere over this ball, then sewed it later, while removing the staples.
A friend on a Fraser 41 , during the queens birthday storm off New Zealand used this type of Galerider drogue with good success. He kept having to shorten the rode to stop it from fouling the skeg, in the troughs, when the line went slack. When it was down to 80 feet , it worked far better, the rode stopped going slack, and they went to sleep til the storm was over. This saves one from having to carry a huge amount of line.
Boats with drogues from the bow tend to lie beam on, which is far less comfortable and puts far greater loads on the drogue and line.
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Brent Swain, Boat designer, Builder, and author of "Origami Metal Boatbuilding"

Last edited by Brent Swain; 04-19-2012 at 09:03 PM.
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