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From Spain:Need experienced counsel to install Aux. motor. Comtessa2850-gctid823957

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  • From Spain:Need experienced counsel to install Aux. motor. Comtessa2850-gctid823957

    ]I have a completely restored Contessa 2850 . Following members advice I installed a Volvo KAD44 diesel with a Volvo duoprop tail. results have been magnificent!!! 36 knots max speed and dos 20 knots just at 2750 rpms consuming 20 liters per hour! Couldn't have wished for anything better.

    As I trawl 25 miles from the coast in a dangerous area (strait of Gibraltar) I'm always worried about motor or tail problems, so I have decided to install a Yamaha Enduro 40hp as an auxiliary (do you call it this way?) motor. I have a completely new unit and I believe it would have enough power to bring the boat back to port at 8/10 knots....

    Has anyone done something similar? IS it to big?

    I would need ideas of how to do it. Information of how strong the support should be, size, positioning, etc...

    This is the boat




  • #2
    I'm guessing a 20 hp would be a max on that you won't be able to plane just go trolling speed anyway.

    You would need to put a trolling motor mount on your swim platform and add steering and controls.
    1989 Avanti 3450 Sunbridge
    twin 454's
    MV Mar-Y-Sol
    1979 Bayliner Conquest 3150 hardtop ocean express.
    Twin chevy 350's inboard
    Ben- Jamin
    spokane Washington

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    • #3
      Thanks for your reply!

      I only have this motor and it's obviously to big for the swim platform. DO you believe I could cut 1/3 of the platform-or eliminate an area, so I could place a motor mount attached to the stern? I need to do 6-8 knots ...not more. But I want peace of mind...

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      • #4
        I understand that you own this engine, but it would be awfully heavy whether mounted on a proper bracket or boarding platform. Maybe you could trade it for a 15 or 20 hp model?
        2007 Discovery 246
        300mpi BIII
        Welcome island Lake Superior

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        • #5
          This is my motor mount when I bought the boat the previous owner had a 20 hp 2 stroke on it.. looking at it there is no way I would put any power to it. 4 or 5 miles an hour at best. I would imagine that pretty much any swim platform would be similar. Most are not made for pushing a boat.




          1989 Avanti 3450 Sunbridge
          twin 454's
          MV Mar-Y-Sol
          1979 Bayliner Conquest 3150 hardtop ocean express.
          Twin chevy 350's inboard
          Ben- Jamin
          spokane Washington

          Comment


          • #6
            Thanks for you info. I have seen a Panther auxiliary motor hydraulic lift MODel 45 http://www.panthermarineproducts.com/trim-and-tilt

            Looks great!

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            • #7
              I would like to know more about the diesel you install do you have pictures

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              • builderdude
                builderdude commented
                Editing a comment
                Just a BTW, this is a 5 year old thread and OP is no longer a memberšŸ«¤

            • #8
              Thanks

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              • #9
                Fair Hair boater......... do a Google search re; the Volvo Penta diesel engine line up.

                Then if you have further questions, let this old thread die, and start a new one for yourself.
                Rick E. (aka RicardoMarine) Gresham, Oregon
                2850 Bounty Sedan Flybridge model 31' LOA
                Twin 280 HP 5.7's w/ Closed Cooling systems
                Volvo Penta Duo Prop Drives
                Kohler 4 CZ Gen Set

                Please, no PMs. Ask your questions on the forum.
                If you leave a "post", rather than a "comment", our members will see recent thread activity!

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                • #10
                  This is what I would do:
                  1. I would not use anything over 20 HP. Moreover, select an outboard made for a sailboat, so it will be efficient and responsive. You want electric start, and a steering rod ahich allows navigation and control from the helm. An outboard made for sailboats, or other displatment boats will have a larger gear casing and a larger diameter prop. Very desirable.
                  2. Look in the boating catalogs. They have swim platforms with a built-in outboard bracket. this would look good and be safe. More so, it would not look so "home built"
                  Captharv 2001 2452
                  "When the draft of your boat exceeds the depth of water, you are aground"

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