Boson's Mate 23 by Bowdidge Marine Designs

Discussion in 'Boat Design' started by Green65, Nov 1, 2021.

  1. Mr Efficiency
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    Mr Efficiency Senior Member

    Have a talk to TANSL, he may be able to conjure something and provide you with something workable, the design is a pretty simple one.
     
  2. bajansailor
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    bajansailor Marine Surveyor

    I think that you have now changed your Statement of Requirements substantially (in relation to the Bosun's Mate 23 in your original post), especially so when you now mention diesel.
    What about something like a typical New England lobster boat design?
    This might be suitable?
    Duffy 26′ | Atlantic Boat Company https://www.atlanticboat.com/duffy26/
     
  3. Mr Efficiency
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    Mr Efficiency Senior Member

    Modest size four-stroke outboards are very easy on fuel, you are getting off the track thinking diesel.
     
  4. Mr Efficiency
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    Mr Efficiency Senior Member

    Just me perhaps, but if they won't sell you the plans, you aren't allowed into the forum, that would be enough to deter me.
     
  5. Green65
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    Green65 Junior Member


    This boat will not care what engine is used on it, or whether it burns gas or diesel. What hasn't changed is that I am still looking for plans and information for the Bosun's Mate 23. And, thanks, but I am not interested in fiberglass a boat that someone else has built.
     
  6. bajansailor
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    bajansailor Marine Surveyor

    Yes, but you can use boats like this as inspiration for finding plans for what you DO want.

    I think that the Bosun's Mate would care (she might be somewhat miffed) if you put a diesel engine in her, instead of an outboard.
     
  7. Mr Efficiency
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    Mr Efficiency Senior Member

    You would think if this boat was a roaring success, given it was around a few years ago, it would at least have some open access reviews available, that's another thing against it in my opinion. This business of ply bulkheads flush up against the ply shell is not ideal to my mind either.
     
  8. Green65
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    Green65 Junior Member


    OK, you have me stumped. Why not put a diesel in the hull? Why is an outboard better if I am trying to be more efficient? Another option would be a gas Honda twin inboard.
     
  9. Green65
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    Green65 Junior Member


    I would have to agree that it was Not a big success for sales...but then again, the designer refuses to sell plans even now.??? Doesn't make sense to me either.
     
  10. bajansailor
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    bajansailor Marine Surveyor

    Because it was simply not designed to have an inboard diesel engine.
    You would need to do a lot of additional work yourself to figure out where to put the engine, build suitable beds that tie in nicely with the existing structure, fit a shaft log and strut for the propeller shaft, decide where to fit a rudder........ you would be much better off in the long run if you acquire a set of plans for a similar type of boat that has been specifically designed for inboard diesel propulsion.

    How efficient is 'efficient' here? A four stroke O/B motor would still get pretty good miles per gallon on a boat like this, and re exhaust gas emissions, it might even be better than an inboard diesel engine re efficiency?
     
  11. Green65
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    Green65 Junior Member



    I understand now. I would agree with you except that i really look forward to all that you have described and am quite capable of designing and fabricating all of the required structure and systems that are required to end up with an inboard installation. On Ross Lillistone's Three Brothers, a similar semi-planing hull, he indicates a diesel would be "Other options include an inboard diesel of between 18 and 22hp, ..... The flat cockpit space would be compromised, but the shape and proportions of the boat make an inboard installation very practical." More here: https://www.duckworksmagazine.com/15/designs/threebros/#.YZCpJ-1OlAE

    Generally, diesels tend to be about 30 % more efficient than gas engines. I am not sure if and inboard is inherently more or less efficient than an outboard though. Good question. So, a four stroke outboard would work very well, but it may not work quite as well, or be exactly what I want.
     
  12. Mr Efficiency
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    Mr Efficiency Senior Member

    The principle reason for not going to diesel would be weight. And doesn't smell so good with a tail wind !
     
  13. Mr Efficiency
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    Mr Efficiency Senior Member

    Does member here HJS have something in his range that might interest you ?

    Sassdesign
     
  14. Green65
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    Green65 Junior Member

    I have been to the Sassdesign before, but only knowing English, moved on quickly. Now I have downloaded a few of the pdf files and see there is a fair bit of reading to do. Including learning more about interceptors.

    I have decided that there is no need to invest in a $4-5000 diesel. I do already have a matching pair of Honda GS 620 V-twin engines that could be used if I chose an inboard installation. That being said, perhaps an outboard (4-stroke) would be expensive for me, but so much easier to just bolt on. If I was going to live on this boat, or make my living with it, a diesel, maybe. But, otherwise, I guess it just isn't necessary to go to all that expense and trouble.

    The best news is that I may have found an original set of prints. Still looking into it.
     

  15. waikikin
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    waikikin Senior Member

    Hi Geen65

    There's enough info available on the link to get pretty close in style, concept & shape. I looked at the design maybe 15 or so years ago as seemed quite versatile as a service boat though for that I'd probably go for a punt/scow style vessel.
    Seems Mark B focused on different style of boats. I used to be on the forum but think I may have dropped off, maybe he just uses it for design support for his more current designs. Pretty sure he may have been on here years ago. People really only have so much time to focus so can understand dropping designs from the range.

    Pretty sure the boat got a complete inner skin of glass before the framing went in, there was one where the build chronicled but don't remember seeing this through to complete- might have been linked on the Bowdidge forum.

    Little four stroke outboards awesome- so quiet & install simple all in the one engineered package.

    Hope it all goes nicely for you

    Regards from Jeff.
     
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