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03-03-2008, 07:28
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#1
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Registered User
Join Date: Jul 2006
Location: Vero Beach, Florida
Boat: Endeavour 37 Ketch "Capella"
Posts: 70
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Single Tube Stainless Dinghy Davit?
Folks;
Last fall I saw some dinghy davits installed on a sailboat. They consisted of a single stainless tube bent in the conventional shape for a stern davit. Very tidy and neat installation.
The skipper of the boat said it got its strength because it contained one thick wall tube inside the outer thick wall one.
Does anyone know what brand this is? (I was told but neglected to write it down. )
Thanks
Ken
__________________
KaptainKen
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"Quidquid latine dictum sit, altum viditur." - Anything said in Latin sounds profound
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03-03-2008, 07:36
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#2
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Registered User
Join Date: Feb 2007
Boat: 1973 Morgan 36T
Posts: 808
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03-03-2008, 07:41
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#3
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Registered User
Join Date: Feb 2007
Boat: 1973 Morgan 36T
Posts: 808
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03-03-2008, 07:50
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#4
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Registered User
Join Date: Jul 2006
Location: Vero Beach, Florida
Boat: Endeavour 37 Ketch "Capella"
Posts: 70
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Kato Marine davits ...
Morgan;
Thanks for the quick reply.
I don't think those are the ones I saw. The Kato Bay-II model is rated 150 pounds each ... possibly because they arn't the double "tube-within-a-tube" type that I saw. The davits I saw were lifting a pretty substantial RIB inflatable with motor.
I'm sure the Kato Bay-II davits are excellent products, but the are borderline, as far as capacity goes, for my application.
Ken
__________________
KaptainKen
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"Quidquid latine dictum sit, altum viditur." - Anything said in Latin sounds profound
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03-03-2008, 08:47
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#5
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Moderator Emeritus
Join Date: Sep 2007
Location: Eastern Tennessee
Boat: Research vessel for a university, retired now.
Posts: 10,406
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You can get stainless tubing in a number of different wall thicknesses to match whatever strength you want..in addition to adding gussets for additional strength. Metal fabricators that specialize in aluminum and stainless for boats can make you whatever you need.
__________________
David
Life begins where land ends.
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13-03-2008, 08:15
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#6
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Sponsoring Vendor
Join Date: Mar 2008
Location: Milton, Ontario
Boat: still dreaming...getting close...
Posts: 192
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Atkins & Hoyle Model 1400
When stainless steel tubes are bent the wall thickness at the bend thins out. This severely limits the strength and can lead to failure. At 200 lbs. a tube inside of a tube simply is not enough. For proper installation, we feel that a quality davit should have at least a 12" solid bar at all load points. You will find that quality davit manufacturers avoid bends at all cost.
Ken, were the davits that you saw rotatable? removable? Were they made from 316 or 304 stainless? At 200 lbs. what was the lifting ratio, 6:1?
__________________
Atkins & Hoyle Ltd. Over 40 years of Marine Innovation, Quality and Craftsmanship
Davits, Hatches, Ports, Hatch Repairs, Motor Lifts, Arches/Hardtops and Custom Designs www.AtkinsHoyle.com | atkinshoyle@dapa.com
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13-03-2008, 09:37
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#7
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CF Adviser
Join Date: Oct 2007
Boat: Van Helleman Schooner 65ft StarGazer
Posts: 10,280
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I agree with benjamaphone. Avoid bends and you should be using pipe sections instead of tube and solid stock at the loading areas.
Here are a couple of photos of my davits.
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14-03-2008, 12:56
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#8
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Sponsoring Vendor
Join Date: Mar 2008
Location: Milton, Ontario
Boat: still dreaming...getting close...
Posts: 192
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Those look pretty good there Pelagic. That's a lot of welding and paint though. And as you probably know, welds are the major entry point for a sailors worst enemy, rust. By avoiding welds, bends and paint, some quality davits can far surpass any DIY job. Davits cast out of Alamg-35 are even better because there is only annodized aluminum-magnesium, no welds and no bends.
__________________
Atkins & Hoyle Ltd. Over 40 years of Marine Innovation, Quality and Craftsmanship
Davits, Hatches, Ports, Hatch Repairs, Motor Lifts, Arches/Hardtops and Custom Designs www.AtkinsHoyle.com | atkinshoyle@dapa.com
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14-03-2008, 18:14
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#9
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CF Adviser
Join Date: Oct 2007
Boat: Van Helleman Schooner 65ft StarGazer
Posts: 10,280
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Sorry the photos were not very good. No paint just highly polished stainless pipe.
They were made in Holland 24 years ago and still look like a piece of jewellery. Not a touch of rust!
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09-06-2008, 02:13
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#10
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Registered User
Join Date: Apr 2008
Location: Fremantle, Western Australia
Boat: Jeanneau, Sun Oddesy DS, 42, Zofia
Posts: 68
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Quote:
Originally Posted by Morgan Paul
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Paul,
Just came across you message and link in my serach for davits. Great stuff thank you
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Brian & Eva
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09-06-2008, 03:38
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#11
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Moderator Emeritus
Join Date: Mar 2003
Location: Hayes, VA
Boat: Gozzard 36
Posts: 8,700
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If you check the details on the above you will see they are rated to only 150 pounds. You'll find normal davits rated double that or more. When you consider the work to install them, the extra price for better davits seem not so much. The other model form the Kato Marine are a better product and more suited for your purpose.
Our last boat had St Croix davits that were removable. They were rated to 300 lbs. Our current davits can't be purchased as they were part of the boat. I like davits just fine but they add 5 feet to the LOA and have a magnetic attraction to wood pilings.
__________________
Paul Blais
s/v Bright Eyes Gozzard 36
37 15.7 N 76 28.9 W
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09-06-2008, 05:17
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#12
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Registered User
Join Date: Apr 2004
Location: Toronto
Boat: CS36Merlin, "La Belle Aurore"
Posts: 7,557
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If you're looking for davits try these. Got a pair six years ago. Excellent.
Ocean Marine Systems - Davits, Rails, Lifts, and Platforms.
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Rick I
Toronto in summer, Bahamas in winter.
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09-06-2008, 18:57
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#13
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Registered User
Join Date: Apr 2008
Location: Fremantle, Western Australia
Boat: Jeanneau, Sun Oddesy DS, 42, Zofia
Posts: 68
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Great info on davits
Guys,
Thank you for the replies. These web site give me a great start. I would like to know your opinions on stern access and how davits interfere with taht. The DS42 has fantastic access from the stern and I would hate to loose this featutre.
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Brian & Eva
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09-06-2008, 19:28
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#14
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Moderator Emeritus
Join Date: Mar 2003
Location: Hayes, VA
Boat: Gozzard 36
Posts: 8,700
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Quote:
I would like to know your opinions on stern access and how davits interfere
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I can still exit with the davits. On our last boat I added a folding ladder to the side because the stern ladder was not usable if I went over board. I sure as hell won't be lost at sea because I couldn't get back on the boat. It's an issue you need to examine, but then I don't think you carry a dinghy on davits when the situation gets nasty or could get nasty. It needs a cozy place on deck or deflated.
They work great for short hops or hanging up the boat to keep the barnacles off and the would be thieves at a disadvantage. With both you at least have to try to win or you won't. Not much is 100%.
__________________
Paul Blais
s/v Bright Eyes Gozzard 36
37 15.7 N 76 28.9 W
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10-06-2008, 06:37
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#15
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Sponsoring Vendor
Join Date: Mar 2008
Location: Milton, Ontario
Boat: still dreaming...getting close...
Posts: 192
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Quote:
Originally Posted by Oldfield
opinions on stern access
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To solve this problem, we have designed a varied line of rotating, removable davits that have a variety of mounting options. You can get a great quality rotating davit that can easily be swung out of the way and can be removed when not in use. If you look around you'll find that there are a few good quality davit manufacturers that can solve any mounting, access or any other issues that might arise when considering davits.
__________________
Atkins & Hoyle Ltd. Over 40 years of Marine Innovation, Quality and Craftsmanship
Davits, Hatches, Ports, Hatch Repairs, Motor Lifts, Arches/Hardtops and Custom Designs www.AtkinsHoyle.com | atkinshoyle@dapa.com
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