Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 14-05-2015, 16:16   #1
Registered User
 
rossny's Avatar

Join Date: Sep 2010
Location: ny
Boat: ketch 46'xxxkikin hulls
Posts: 122
Images: 3
plans for arch / davit ?

Does anyone know of a source for plans or drawings to fabricate an arch / davit for a sailboat ? The weight and wind force ( of the solar panels and dingy)should be considered along with the steel structure itself. Is there a book on the subject ? Will I need to consult a marine architect or engineer ? I need to fabricate and weld myself to conserve money. Thanks...
__________________

__________________
rossny is offline   Reply With Quote
Old 14-05-2015, 17:18   #2
Registered User
 
Delancey's Avatar

Join Date: Oct 2011
Location: Miami, FL
Boat: sunk by irma
Posts: 3,462
Re: plans for arch / davit ?

I could be wrong, but I am pretty sure the answer to all your questions is no and I doubt highly you will successfully conserve money by fabricating yourself unless you already have welding experience.

I am pretty sure of all of this because if you had experience welding I doubt you would be asking these questions.

If you did, you would just copy the size of the tubing, plates, and connections that someone else used for a similar size arch that hasn't already failed. Not trying to be a jerk. A pro would just copy an existing design or modify to suit their needs.

Welding isn't rocket science, it's just melting a small amount of metal and using it to stick different bits of metal together. The problem is that it is skill that takes time and/or money to acquire which sounds contrary to your objective.
__________________

__________________
Delancey is offline   Reply With Quote
Old 14-05-2015, 17:27   #3
Registered User
 
Delancey's Avatar

Join Date: Oct 2011
Location: Miami, FL
Boat: sunk by irma
Posts: 3,462
Re: plans for arch / davit ?

Try again.

I would suggest you go and look at some other arches. Pay attention to the size of the tubing, plate thicknesses, and how the connections are made. As long as you can making something as strong as has been proven elsewhere you're good to go.

Easiest way to understand how it will affect stability on the boat is to do a mock-up and test the righting moment. Cheaper than paying for engineering.
__________________
Delancey is offline   Reply With Quote
Old 14-05-2015, 19:44   #4
Registered User

Join Date: May 2009
Location: Grenada
Boat: Shorebro,Royal 33 - Aloisius
Posts: 927
Re: plans for arch / davit ?

I would pay a good welder and you describe what you want and he give you a few options. Each boat and project is unique. That is the fun in having a project.


Sent from my iPad using Cruisers Sailing Forum
__________________
landonshaw is offline   Reply With Quote
Old 15-05-2015, 09:52   #5
Senior Cruiser

Cruisers Forum Supporter

Join Date: Dec 2010
Location: Cruising Indian Ocean / Red Sea - home is Zimbabwe
Boat: V45
Posts: 1,282
Re: plans for arch / davit ?

......and determine the all the functions / use of the arch. Shall it also be used to pull your dinghy up (as davits)? Think about adding eyes to attach all manner of things to it in the future. Do you want to include a plate for a stern light? Or a cockpit light etc? We always include (now) an outlet for a shower head as well as a plunger tap having seen this on another boat several years ago. Make sure you include leaders when installing the arch such that you can pull through your wiring for the electrics. We have never consulted anyone else - rather we know what we want and get it fabricated. Welding stainless is not difficult but getting a nice finish is not so easy - at least for me! Best advice is to look at the same boat as yours and see what their design is and whether it meets with your criteria. Regardless, look at as many other arches as you can before committing. Laern fromwhat others have done and what they wished they had done. If doing yourself, consider how you shall bend the tubing unless you are going to weld every angle. Also consider how & where you shall mount the arch - is any reinforcement required?
__________________
Bulawayo is offline   Reply With Quote
Old 15-05-2015, 10:18   #6
Registered User

Join Date: Sep 2013
Location: Alert Bay, Vancouver Island
Boat: 35ft classic ketch/yawl.
Posts: 935
Images: 4
Send a message via Skype™ to roland stockham
Re: plans for arch / davit ?

Depending on your boat (ie looks) you can do a very nice one in epoxy ply if that suits your skill set
__________________
roland stockham is offline   Reply With Quote
Old 15-05-2015, 12:01   #7
Registered User
 
Cadence's Avatar

Join Date: Dec 2008
Location: SC
Boat: None,build the one shown of glass, had many from 6' to 48'.
Posts: 6,063
Re: plans for arch / davit ?

Quote:
Originally Posted by rossny View Post
Does anyone know of a source for plans or drawings to fabricate an arch / davit for a sailboat ? The weight and wind force ( of the solar panels and dingy)should be considered along with the steel structure itself. Is there a book on the subject ? Will I need to consult a marine architect or engineer ? I need to fabricate and weld myself to conserve money. Thanks...
Find a machine shop with an owner 80ish and has done marine work. Just bring a rough drawing. They have probably been there done that.
__________________
Cadence is offline   Reply With Quote
Old 15-05-2015, 12:04   #8
Registered User

Join Date: Apr 2013
Posts: 4,880
Re: plans for arch / davit ?

If you are doing it in stainless, make sure you know how to weld stainless or it will rust at the joints.

I designed ours but had a stainless guy weld it up. It's basically simple truss design and making sure you have solid attachment points to secure the base to.

As long as the dimensions are close, you can probably get away with copying an existing davit.

If you don't have welding experience, a wood/epoxy design may be more suitable for DIY. If you have good skills finishing (I don't), you can make a very nice design.
__________________
valhalla360 is offline   Reply With Quote
Old 15-05-2015, 12:49   #9
Registered User
 
mserafi1's Avatar

Join Date: Feb 2014
Location: Cape Coral Fl.
Boat: Offshore 33 cat ketch
Posts: 67
Images: 1
Re: plans for arch / davit ?

Check out fishonsports.com and see what they provide for the do it yourselfers. I'm going to do the same thing you're thinking about by using one of their arches with davits to mount panels and hang my dingy. I think there's some room for customization, but the basic arches are pretty flexible.

Blue Skies
__________________
mserafi1 is offline   Reply With Quote
Old 15-05-2015, 12:52   #10
Registered User

Join Date: Oct 2014
Location: california
Boat: jeanneau 39i
Posts: 62
Re: plans for arch / davit ?

I put a pre made dingy davit and solar panel arch on my Jeanneau 39 just last year. I was going to have one custom made. Prices were crazy. I contacted Garhauer Marine and bought one with a few changes. Came out perfect. It holds a 10 4 rib 9.8 tahatsu engine and a 150 watt solor panel. Their number is 909 985 9993 ask for mike. If you would like some pictures or have any questions send to jtindle3@aol.com
__________________
jmtindle3 is offline   Reply With Quote
Old 15-05-2015, 14:51   #11
Registered User
 
Madehn's Avatar

Join Date: Nov 2014
Location: Kemah Tx
Boat: Gulfstar 51
Posts: 84
Re: plans for arch / davit ?

so i designed my own then built a mock up using PVC pipe-- decided to overbuild it on the assumption that heavier material would not cost that much more and might come in handy-- ended up with a great arch and davit combination that is very sturdy- used 1.5 inch thick wall stainless tubing. i went to a machine shop guy that speacializes in stainless steel kitchens-- gave him plenty of time and was precise in my measurements- he did a great job at 25% of the price that the local Marine Stainless guy wanted-- no it does not look quite as good as the Marine Guy's but it is close.
__________________
Madehn is offline   Reply With Quote
Old 15-05-2015, 15:09   #12
Registered User

Join Date: Jan 2009
Posts: 141
Re: plans for arch / davit ?

You're certainly correct about wanting to build it yourself. The cost of a custom fabricated arch is likely to run into thousands of dollars. But the skills needed to cut, bend and weld material, not to mention the time it might take is also considerable.
You may want to consider buying something used. I live in Florida, and there are, literally, tons of this stuff laying around in boatyards, marine salvage centers, craigslist, etc. Something that came off someone's go fast boat or sport fisherman might be just right for your needs with only a little cutting and fabricating to adapt it. All you have to do is find it before it goes to the recycler or land fill. The fact that it may come already festooned with antenna mounting tabs, lights, radar platforms and rod holders is a bonus!
I once asked a local marine engineer/fabricator to build a combination stem head fitting/anchor roller for my 30 Arpege. After a week of studying on it, his estimate was $4500. I laughed in his face. He came down to $3000. A month later I bought a custom fabbed anchor roller off a 50 foot trawler for $35 at a nautical flea market, drilled a few holes in it and bolted it on. Ten years and three hurricanes later it's still working and looking great.
Someone else suggested molding your own from fiberglass and epoxy. That would certainly be doable if you have time and a place to do it. It wouldn't be terribly difficult to mock up exactly what you want in plywood, PVC, and bondo and create a mold or form to layup glass and epoxy on.
Good luck.
__________________
dgz3 is offline   Reply With Quote
Old 15-05-2015, 16:23   #13
Senior Cruiser
 
hpeer's Avatar

Cruisers Forum Supporter

Join Date: Dec 2008
Location: Philadelphia
Boat: Murray 33-Chouette & Pape Steelmaid-44-Safara-both steel cutters
Posts: 3,900
Re: plans for arch / davit ?

Four years ago I tabbed our arch. I don't use it as da its, but I could.

I took a high quality side shot of the boat from a couple of hundred feet. Reduce parallax. I then sketched the hull shape in an el cheaper CAD program. I drew the arch on the hull, messed with it until I got it right.

I printed the angles out and used them to make my cuts.

I made the arch out of schedule 40 electrical conduit, heavy wall, hot dipped galvanized. The bends were of standard 90 elbows. I made it in the basement and took it to the boat and assembled it. I then welded it to our steel deck, on reinforced pads I had welded down. I then welded the couplings up.

Been 4,000 miles and it's doing fine. Paint does not want to stick to the zinc, but I'll live with it.

Cost? Maybe $300.
__________________
hpeer is offline   Reply With Quote
Old 15-05-2015, 20:47   #14
Registered User

Join Date: Sep 2014
Location: Tracys Landing, MD
Boat: TPI, Manta Clipper, 34' DeFever CPMY 49
Posts: 24
Re: plans for arch / davit ?

Contact Annapolis Marine Fabrcaters, in Annapolis, MD. Owners name is Olver, not Oliver
__________________
Captain Bill 3 is offline   Reply With Quote
Old 16-05-2015, 08:40   #15
Registered User
 
Capt Doug's Avatar

Join Date: May 2010
Location: ON the Boat /Ft Myers Beach
Boat: Seafarer 38C
Posts: 60
Re: plans for arch / davit ?

Forget all the BS welding steel (wtf) I helped my nephew install a aluminum arch that has to large solar panels, will lift a heavy dinghy and has plenty of options for add on's. Talk to the people at FISHONSPORTS.COM no welding, you will spend much less than other options.
__________________

__________________
Capt Doug says:
If at First you don't succeed, Take a NAP!
Capt Doug is offline   Reply With Quote
Reply

Tags
arc

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
Hard Bimini Arch Davit Combo Catalina 36 mike37909 Construction, Maintenance & Refit 6 07-12-2013 15:05
Radar Arch and Dinghy Davit jjahanmir Monohull Sailboats 2 31-10-2012 20:32
self steering and arch/davit builder for Elan 43 bde100 Meets & Greets 5 18-05-2008 06:06
Need plans for a radar--etc. arch prout35 Multihull Sailboats 2 02-02-2006 10:35
Does anybody have experience with this Davit system??? exposure General Sailing Forum 5 27-08-2004 08:57



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 22:37.


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.