Will my swim platform hold this dinghy?

Discussion in 'Dinghies' started by Twinbrook, Apr 1, 2018.

  1. Twinbrook

    Twinbrook New Member

    Apr 7, 2014
    Middle River, Md
    1998 Sundancer 370
    twin merc 7.4 MPI''s
    We have a 1998 Sea Ray Sundancer 370 which has Weaver davits mounted and the current dinghy is a Achilles 10' air floor with a 6hp Tohatsu engine. We've laid the engine on the platform when under power.

    We are buying a RIB inflatable that is about 20lbs heavier and will keep the engine mounted and will use a Dinghyramp XL pull on mounted to the swim platform. Total weight will be about 180 pounds. Anyone know or think thai weight might be a problem? Any advice would be appreciated since the marinia/dealers seem not to be able to give me a straight answer. I don't know if there any information out there so I was wondering is anyone has a setup like I'm looking at.

  2. NotHerDecision

    NotHerDecision Well-Known Member

    Jun 28, 2016
    Houston, Texas
    2001 Sea Ray 460 Sundancer
    2014 Seadoo 155 LTD
    2105 Seadoo 130 SE
    2013 Mercury Dinghy
    Cummins 6CTA 8.3L
    I have a similar set up. Your platform won’t have a problem. The 2 issues I see is you loading it and the running angle of the boat. You may need help loading it, but you can test the weight back there with 180lbs of ballast. If I were testing I would test with 220 just to be safe.

    For reference I have a 8.6ft Mercury with a 6hp four stroke and custom davits from Masterfab on this forum. I am using a 460 with twin Cummins 6ctas. I recommend you call dale (masterfab)
  3. electricaldoctor

    electricaldoctor Well-Known Member TECHNICAL Contributor PLATINUM Sponsor

    May 14, 2008
    Thousand Islands, Rockport, Ontario.
    1988 390 EC
    454 Mercruiser Gassers
    180 lbs=1 man
    sounds like an easy test to me.
  4. Ezsteps

    Ezsteps Active Member PLATINUM Sponsor

    Nov 14, 2015
    Lake St. Clair-- Michigan
    1999 400 Sundancer, YL310 Zodiac
    7.4 Mercuisers Horizons 380 hp ea., 9.9 hp Mercury
    I have a 10'6" RIB Zodiac with a 9.9 Mercury 4 stroke. I also put it up on custom davits (similar to yours) and don't have a problem. I believe total weight is close to 200 lbs. I use a block and tackle system to pull it up with. 20170704_105221.jpg

    Just noticed how small it looks in that picture without a cover so I added one with the cover taken from the back standing on the dock .

    Attached Files:

  5. sr330daguy

    sr330daguy Member

    Mar 14, 2007
    Hudson River
    97 330da
    7.4 MPI's Bravo 1s
    Westebeke 4.5
    My 330 (which may be similar to yours) has an upper an lower type platform. I recently found a set of Nautley Dingy Ramps, to but due to fact that my lower platform was shorter than 1/2 of the dingy beam, modification was in order. Another factor was height to clear the upper platform. I contacted Dale (Masterfab) and discussed the situation with him. When I arrived at his shop he had already sketched out his idea of the modification ,it was exactly what I pictured. Let me say upfront his craftsmanship is second to none! I have a 10 foot mercury solid floor with 8 Yamaha approximate weight 160 lbs. And after a year I see no stress or problems on the platform. I did add 3/16 aluminum plate under the platform for the Weaver quick mounts.They worked very well ,but need a little angle added ,as the platform is sloped ,then they get sent out for electroplating. Hope this helps.

    Attached Files:

    Last edited: Apr 2, 2018

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