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  1. #1
    Join Date
    Sep 2011
    Location
    Lindenhurst NY
    Boat
    Sea Ray
    Details
    2000 Sea Ray 310 Sundancer
    Engine(s)
    T300hp Mercruiser Inboards
    Posts
    147

    DIY Dinghy Davit advise / ideas needed

    I drew up plans for a davit that will allow me to have the dink launch and retrieve from the swim platform
    https://scontent-lga3-1.xx.fbcdn.net...a4&oe=58D5F91C
    https://scontent-lga3-1.xx.fbcdn.net...a7&oe=591402C6
    https://scontent-lga3-1.xx.fbcdn.net...fb&oe=58DFAC56

    Im trying to figure out how best attach it to the underside of my swim platform.
    My goal is to attach two 2' x 1.5" SS square tubes to the underside of the swim platform (that a smaller tube slides into) without having any hardware or minimal hardware showing on the top of the swim platform. I'm afraid that just using a recessed screw or recessed bolt head will pull through the platform. I don't want a tripping hazard or anything that will interfere with the platform when the davit is not on the boat.
    Any ideas?
    Thanks
    Last edited by ArtWallach; 01-11-2017 at 09:57 AM.
    GaleFORCE
    2000 Sea Ray 310 Sundancer
    T-350 MPI - VDrive

  2. #2
    Join Date
    Aug 2015
    Location
    Southport Marina - Kenosha WI - Lake Michigan
    Boat
    Sea Ray
    Details
    410 Sundancer
    Engine(s)
    Caterpillar 3126
    Posts
    106

    Re: DIY Dinghy Davit advise / ideas needed

    There's been a few discussions on davits in the dinghy section, so may want to post there if you don't get many responses.
    2002 Sea Ray 410 Sundancer
    1998 Silverton 360 Express - Traded
    1989 Sunrunner 318 Express - Traded

  3. #3
    Join Date
    May 2016
    Location
    Spring Lake, MI
    Boat
    Sea Ray
    Details
    2001 Sea Ray 410 Sundancer, Raymarine E125 GPS
    Engine(s)
    CAT3126 TA's
    Posts
    69

    Re: DIY Dinghy Davit advise / ideas needed

    Looks nice. Your design reminded me of an earlier design I saw on a blog I was following a few years ago when Dale was working on his 340. Here's the blog address http://searay340restoration.blogspot.com Look at the July and October 2012 posts for more information and pics.
    Previous boats:
    2001 Sea Ray 340 Sundancer
    2002 Sea Ray 260 Sundancer
    2004 Sea Ray 240 Sundeck
    2001 Sea Ray 210 Sundeck

  4. #4
    Join Date
    Sep 2011
    Location
    Lindenhurst NY
    Boat
    Sea Ray
    Details
    2000 Sea Ray 310 Sundancer
    Engine(s)
    T300hp Mercruiser Inboards
    Posts
    147

    Re: DIY Dinghy Davit advise / ideas needed

    Thanks for the quick responses.
    @Tom,
    I saw Dale's post. I loved his davit concept, downloaded it, studied it and I've incorporated most of his ideas into my design. I just can't do them all since I can't machine and weld like he did. I had to adapt his and other concepts into something I can make with hand tools. I just don't have a great idea for the final attachment methodology.
    GaleFORCE
    2000 Sea Ray 310 Sundancer
    T-350 MPI - VDrive

  5. #5
    Join Date
    Jan 2015
    Location
    Mattapoisett, MA
    Boat
    Sea Ray
    Details
    2007 Sundancer 44
    Engine(s)
    Cummins QSC 8.3
    Posts
    196

    Re: DIY Dinghy Davit advise / ideas needed

    You'll need some type of backing plate, a very large washer or square plate would do fine. Then use a button head screw, put the nuts on the bottom side under the platform.

    https://www.boltdepot.com/Socket_but...-8_3_8-16.aspx

    Will be about as minimal as you could possibly get unless you route out the top of the platform and "countersink" the backer plate and screw head.


    2007 44DA Daddy's Toy
    Cummins QSC 8.3 500
    Highfield CL290 Yamaha F9.9

  6. #6
    Join Date
    Dec 2007
    Location
    East Coast Florida
    Boat
    Sea Ray
    Details
    300 Sundancer
    Engine(s)
    5.0MPI Bravo III
    Posts
    1,462

    Re: DIY Dinghy Davit advise / ideas needed

    My platform has "stringers" under it for support running from the edge of he platform to the transom - they are glassed in and part of the platform. I know some older boats don't do this - and support the less ridged platform by using metal down bars......if your boat doesn't have the stringers....add them, perfect place to tie the mounts into

  7. #7
    Join Date
    May 2010
    Location
    Lake St.Clair
    Boat
    Mainship
    Details
    1998 31 Sedan Bridge
    Engine(s)
    Twin 350 Marine Power
    Posts
    1,320

    Re: DIY Dinghy Davit advise / ideas needed

    Your Davits are too far forward on the dinghy. All the weight is in the back. I would also question making the arms out of 1/2" starboard. That's pretty small. I used 1".

  8. #8
    Join Date
    Aug 2010
    Location
    Wallkill, NY
    Boat
    Sea Ray
    Details
    2002 340 Sundancer, Rescued, Restored, Modernized, and now Sold
    Engine(s)
    8.1L Horizons, ZF 63 V Drives
    Posts
    1,129

    Re: DIY Dinghy Davit advise / ideas needed

    You are within driving distance of my shop, so if you want to come up one day, I can machine any specialty parts you need to get this done. I'll need to know what size and thickness material, beforehand, so I can have it in stock.

    Dale

  9. #9
    Join Date
    Sep 2011
    Location
    Lindenhurst NY
    Boat
    Sea Ray
    Details
    2000 Sea Ray 310 Sundancer
    Engine(s)
    T300hp Mercruiser Inboards
    Posts
    147

    Re: DIY Dinghy Davit advise / ideas needed

    I would prefer the port davit arm being more to the stern of the dink, but the model Zodiac I have purchased has two rudder strakes that are depicted with the dark rectangles. I basically have two choices.
    https://scontent-lga3-1.xx.fbcdn.net...6f&oe=591B3E96
    Sliding the dink on either fore or aft of the rudder strakes. If I put the davit arm aft of the strakes I have only a 2" margin of missing the dink transom when pulling it onto the swim platform.
    If the davit arm is forward of the rudder strakes it is only 14" to the transom. The dink tubes going to the points are the vast majority of the overhang.
    Since I'm using rubber wheels I think (hope) I'll be fine with the 1/2" HDPE. I used 1" on a rocket launcher table I made (replaces cockpit table when fishing).
    https://scontent-lga3-1.xx.fbcdn.net...e2&oe=5914BEA3
    https://scontent-lga3-1.xx.fbcdn.net...e4&oe=591CAA47
    It is very heavy for its size.
    Last edited by ArtWallach; 01-11-2017 at 03:44 PM.
    GaleFORCE
    2000 Sea Ray 310 Sundancer
    T-350 MPI - VDrive

  10. #10
    Join Date
    Sep 2011
    Location
    Lindenhurst NY
    Boat
    Sea Ray
    Details
    2000 Sea Ray 310 Sundancer
    Engine(s)
    T300hp Mercruiser Inboards
    Posts
    147

    Re: DIY Dinghy Davit advise / ideas needed

    Dale,
    Thank you for your incredibly generous offer. We are about 120 miles (2-3) hours apart.
    If it comes down to having to fabricate it would be worth the trip.
    Thank you.
    GaleFORCE
    2000 Sea Ray 310 Sundancer
    T-350 MPI - VDrive

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