Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 21-08-2009, 12:15   #1
Registered User

Join Date: Jul 2007
Posts: 95
Lagoon 380 Maximum Davit Load ?

Hi,

Anyone know what the max weight supported on a the L380 (2004) davits is? I'm trying to see if there's a dingy that would work for the 380 that could pull a skier/wakeboarder. I believe the lightest RIB for this is a Walker Bay Genesis 310/340. They weigh in at around 225lbs. Add on 130-175lbs for a 20-30 hp engine. Walker Bay Boats

Could this work?? If not, any suggestions?

Thanks!
__________________

__________________
cbcat is offline   Reply With Quote
Old 21-08-2009, 12:50   #2
Registered User

Join Date: Jul 2007
Posts: 95
Follow up.... A 12' AB with a 30 hp would be in the 300lb range. Basically sub 500lb with fuel, battery, St. Croix system etc. can easily be done. Just need to find out what the max weight and max dingy length is. If it can't handle 400/450 lb how difficult & expensive would it be to reinforce the davits or replace them all together?
__________________

__________________
cbcat is offline   Reply With Quote
Old 21-08-2009, 13:16   #3
Senior Cruiser
 
Cheechako's Avatar

Cruisers Forum Supporter

Join Date: Aug 2006
Location: Skagit City, WA
Posts: 19,369
I'm not familiar with the 380 davits. My older Lagoon 42 davits held a loaded, heavy 10 ft rib and 15 hp fine, I saw no indication of over stressing or over flexing. One option if you are worried is to put a short "spreader" system on top. Basically a short tube at about half way with a wire strung from the tip over the end of the tube and fastened to the boat with a turnbuckle. The tube could easily be made with bimini fittings etc.
__________________
Cheechako is offline   Reply With Quote
Old 21-08-2009, 20:25   #4
DRS
Registered User
 
DRS's Avatar

Join Date: Jun 2009
Location: Vancouver BC
Boat: Lagoon 380
Posts: 351
Images: 7
I have an 11.5 foot AB alum hull inflatable with 20 hp 4 stroke Honda hanging on mine. I need to use the port side winch to raise the aft of dingy. In order to do this I tie a block to the top of the bimini structure to route the line so it does not rub on the helm seat or wheel. I think I am about maxed out. I can't lift one half of the dingy on my own and any more weight on the bimini structure would be pressing my luck too.
I dont know if you can see it in the pictures (lower right davit) but previous owner had added some small rope supports from the davits back to the hull. Not to sure how much help they really provide.
Attached Thumbnails
Click image for larger version

Name:	P5300768.jpg
Views:	955
Size:	513.9 KB
ID:	9481  
__________________
You can sail anywhere on the planet and never be more than 7 miles from land - it might be straight down, but its never more than seven miles
DRS is offline   Reply With Quote
Old 22-08-2009, 01:57   #5
Registered User
 
Laidback's Avatar

Join Date: Jun 2007
Posts: 853
The davits should also be stayed port and starboard to cleats to ensure that the dinghy and engine when fully lifted, do not start swinging side to side in a heavy sea and eventually causing serious damage to the davit brackets and/or the boat structure.
__________________
Laidback is offline   Reply With Quote
Old 22-08-2009, 07:00   #6
Registered User
 
db8us's Avatar

Join Date: Feb 2006
Location: Pune, India
Boat: Lagoon 380S2
Posts: 74
Send a message via Yahoo to db8us
200kg is the max load.
I have 3 solarpanels on a stainless steel structure there (60kg) and a Caribe 9ft Dinghy with a 5HP 2 stroke Yamaha and no problems.
__________________
db8us is offline   Reply With Quote
Old 22-08-2009, 07:17   #7
Senior Cruiser
 
Talbot's Avatar

Cruisers Forum Supporter

Join Date: Jun 2004
Location: Brighton, UK
Boat: Privilege 37
Posts: 3,579
Images: 32
Dont forget to factor in the weight of water from a rainstorm overnight.

There is a significant difference between maximimum load, and maximum safe working load.

if the yacht is really being hammered in bad weather, if the tender is not lashed down very thoroughly, loads on the davits can be multiplied significantly by kinetic energy loading as the dinghy moves.


I added davits to my catalac and then added a solar panel and frame on top of the davits. I also added a bracing piece to the davits in order to significantly increase the safe working load.
__________________
"Be wary of strong drink. It can make you shoot at tax collectors - and miss."
Robert A Heinlein
Talbot is offline   Reply With Quote
Old 22-08-2009, 09:54   #8
DRS
Registered User
 
DRS's Avatar

Join Date: Jun 2009
Location: Vancouver BC
Boat: Lagoon 380
Posts: 351
Images: 7
When in transit the dingy is hauled up tight to the davit posts and we use the bow and transom mooring lines of the dingy to tie it back to the stern cleats on the 380 to prevent swing.

Also remove plug when dingy is in davits to prevent build up of rain (a regular occurance in this part of the world).
I've only set it back in the water once without the plug
Plug is on an 18" tether so I don't loose it.
__________________
You can sail anywhere on the planet and never be more than 7 miles from land - it might be straight down, but its never more than seven miles
DRS is offline   Reply With Quote
Old 22-08-2009, 10:10   #9
Senior Cruiser
 
Cheechako's Avatar

Cruisers Forum Supporter

Join Date: Aug 2006
Location: Skagit City, WA
Posts: 19,369
The limiting factor may be the hull attachment. That would be the high stress point. If you give me the tube size, length and wall thickness, I can calculte the static tube failure point, my guess is it's way above what you're doing just visualizing the tube size....but as I said, the boat structure may be the issue...
Good point on overnight water in the dingy!!
__________________
Cheechako is offline   Reply With Quote
Old 24-08-2009, 14:41   #10
Registered User

Join Date: Jul 2007
Posts: 95
Any ideas on what a custom davit fabrication might cost? Something where the load can be increased well above 500lbs? With DRS' setup AND solar it'd be well over the factory's limit on those Davits (I think).

DRS... Did your setup ever create an unsafe situation at sea? Do you find you use the bigger engine/St. Croix kit enough to justify it?

Thanks!
__________________
cbcat is offline   Reply With Quote
Old 24-08-2009, 14:47   #11
Registered User

Join Date: Jul 2007
Posts: 95
Also (to DRS)... any issues with security. That's a NICE dingy to be hanging off the back... lots of temptation in the wrong time/place could invite theft. Not to say anyone's dingy/engine aren't tempting, but this setup might stand out a bit much on a 38' cat...? Thoughts?

Talbot... good point on kinetic energy loading in bigger seas. Especially with a 20-25 hp engine haning on one end. Even if the dingy is well secured, the boat will have energy loading from waves, water etc., that may be dangerously transfered to the stren of the boat with a 400lb dingy back there.
__________________
cbcat is offline   Reply With Quote
Old 24-08-2009, 16:51   #12
DRS
Registered User
 
DRS's Avatar

Join Date: Jun 2009
Location: Vancouver BC
Boat: Lagoon 380
Posts: 351
Images: 7
I have not had sea's big enough to cause a concern (maybe 10 feet and steep) PO went to Alaska and back with the set up.
Security - locks, cables and chains don't know what else you can do. If they want it bad enough they'll find away to get it
I thought I heard somewhere the max load was 350 pounds. I have nothing to confirm this.
Sorry I'm not sure what the St.Croix kit is please explain further.
__________________
You can sail anywhere on the planet and never be more than 7 miles from land - it might be straight down, but its never more than seven miles
DRS is offline   Reply With Quote
Old 24-08-2009, 17:43   #13
Registered User

Join Date: Jul 2007
Posts: 95
10' and steep is a decent test... Not sure about a transpac though! True on the security. May be appear tempting, but if it's Fort Knox, then they'll probably opt for easier prey. At this point, I'd be using this in the Caribbean... so aside from a 2 or 3 day passage most would be a day or less and hopefully not in terribly heavy seas. A St. Croix kit is also known as a Euro Helm... looks like that's what you have on yours.

http://www.davit.com/euroHelmSeat.html
__________________
cbcat is offline   Reply With Quote
Old 24-08-2009, 17:45   #14
Registered User

Join Date: Jul 2007
Posts: 95
DRS - As for the original idea, did you buy this setup for the same reason I'm thinking (wakeboarding etc.)? If so, do you find that you really use it or now, in hindsight, not nearly as much as you planned to?
__________________
cbcat is offline   Reply With Quote
Old 24-08-2009, 19:03   #15
DRS
Registered User
 
DRS's Avatar

Join Date: Jun 2009
Location: Vancouver BC
Boat: Lagoon 380
Posts: 351
Images: 7
Set up came with boat when I purchased it. My "kids" are 17 and 19 and use the ski boat for that sort of stuff. This one is really set up more for fishing with 2 down rigger pads by the seat. I also have a ram mouted fishfinder that goes on the rail above the wheel. St Croix (thanks for the lesson) set up is a nice touch comfort wise. Admiral is none to happy sitting on wet tubes or a wet floor. Weight distribution is a little far back for my liking with 2 adults on the seat. Takes a bit to get it to plane but for cruising the anchorages an sight seeing it works great
__________________

__________________
You can sail anywhere on the planet and never be more than 7 miles from land - it might be straight down, but its never more than seven miles
DRS is offline   Reply With Quote
Reply

Tags
davits, lagoon, lagoon 380

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
380: Lagoon 380 Tragedy cruisecat99 Lagoon Catamarans 150 03-03-2016 10:39
380 S2: Lagoon 380 vs Leopard 38 jimlong Lagoon Catamarans 94 25-01-2015 17:09
380: Lagoon 380 Genaker ? bnort3 Lagoon Catamarans 0 15-03-2010 20:17
380: Lagoon 380 VS 380 S2 rosco Lagoon Catamarans 1 01-06-2008 08:52
380: Lagoon 380 mpk Lagoon Catamarans 8 10-09-2004 08:35



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 09:33.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.