Wide mounted twin outboards on monohull

Discussion in 'Powerboats' started by fpjeepy05, Aug 11, 2022.

  1. BlueBell
    Joined: May 2017
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    BlueBell . . . _ _ _ . . . _ _ _

    Again no, not on a monohull but there is no reason you couldn't do it, especially on a long skinny hull.
    You can manually trim most o/b's from the trim tab on the bottom of the cav plate (which is actually an anti-ventilation plate but nobody calls it that).
    However, be warned, this is likely to reduce your resale value because, as your about to see by all the negative responses, this is an unconventional design characteristic.

    EDIT: I've driven lots of twin engine boats on one engine. The asymmetrical thrust is a minor issue. Some catamaran sailboats use only one 9.9 mounted on one pontoon and require very, very little rudder correction.
     
    Last edited: Aug 16, 2022
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  2. DogCavalry
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    DogCavalry Senior Member

    I've seen an off center OB. On a semi catamaran hull. It worked ok. Slight steering adjustment, but workable.
     
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  3. fpjeepy05
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    fpjeepy05 Senior Member

    Semi catamaran? Something like that Aspen catamaran?
    Agreed
     
  4. BlueBell
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    BlueBell . . . _ _ _ . . . _ _ _

    If you're clever in the design of your transom, you may be able to make it easier to convert to a traditional centre mount down the road.
     
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  5. BlueBell
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    BlueBell . . . _ _ _ . . . _ _ _

    Wait, why not a side door?
     
  6. fpjeepy05
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    fpjeepy05 Senior Member

    That would work as well. I am used to fishing on boats that have them in the transom.
     
  7. BlueBell
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    BlueBell . . . _ _ _ . . . _ _ _

    Most search and rescue boats use side doors.

    Commercial fishing? I thought this door was for freediving.

    Regardless, one consideration is a transom door would be subject to lower pitch angles
    versus a side door which would experience higher roll angles, especially in a skinny boat, potentially.
     
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  8. DogCavalry
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    DogCavalry Senior Member

    Pitch vs roll. Excellent point.
     
  9. fpjeepy05
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    fpjeepy05 Senior Member

  10. fpjeepy05
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    fpjeepy05 Senior Member

    Just thought of this... Side doors are likely more expensive as far as I can tell. The transom door in the picture above is a piece of acrylic with hinges and a latch. Maybe $50. Making an operating, safe, and decent looking side door might cost more.
     
  11. BlueBell
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    BlueBell . . . _ _ _ . . . _ _ _

    It may be more work too but what's the objective, to cost the least or best suit your needs?
     
  12. fpjeepy05
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    fpjeepy05 Senior Member

    Ideally, both would be nice. In the production world, cost is more important.
     
  13. BlueBell
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    BlueBell . . . _ _ _ . . . _ _ _

    Really, you're aiming at commercial production?
     
  14. fpjeepy05
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    fpjeepy05 Senior Member

    Yes and no. I work in the industry. I would like to develop as a side hustle and if it does well give up the day job.
     

  15. fpjeepy05
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    fpjeepy05 Senior Member

    I found the boat I was thinking of. Solace 345. I couldn't remember who made it. A coworker reminded me. I think it is a little too out of the box. It might be discontinued judging from their website.

     
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