FAT BOY DESIGN "what do you think ?"

Discussion in 'Boat Design' started by Buckie, Sep 30, 2007.

  1. mydauphin
    Joined: Apr 2007
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    mydauphin Senior Member

    I like the attempt at the first ************ submarine...
     
  2. Harponero
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    Harponero New Member

    Thank you mydauphin! I thought my mind was the only one in the gutter. A slightly improper placement of a bow pulpit and that sketch would be positively X-rated ;) Given the anatomical similarities I would avoid a single exhaust in the center of the transom. Will this be a single screw or a twin screw design? :D

    All kidding aside, where is the waterline and is this intended to be a catamaran hybrid of some type?
     
  3. mydauphin
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    mydauphin Senior Member

    All kidding aside....
    If you cut back on obvious disproportioning of catamaran keels... And twin ***** hanging from bottom. The idea - I Guess- is a boat that lifts itself on some kind of air lubrication - via some ducting of fluids under it. ... Still sounds porno...

    But what would happen if structure where thin enough to reduce drag, and properly shape and balance may be you could get some lift. And turn it into some kind of lifting body hydrofoil. But my experience is that these design work in flat calm water with perfect trim and weight distribution. But like catamarans are prone to function incorrectly outside a small envelope.

    In the real world, a v-monohull WORKS best. A catamaran work well, if big enough. Everything else works only within certain parameters and conditions.

    Ps. If you add a pistol grip, I think it would make for a great Ray Gun...
     
  4. SamSam
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    SamSam Senior Member

    I mentioned that in post #5 and was thinking it should maybe be "Fat Girl".
     
  5. yacht371
    Joined: Aug 2005
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    yacht371 Yacht Designer

    What keeps it upright? The shape looks as if it would fall over as soon as you try to float it, unless it has a very low CG (plenty of ballast down low). Naval Architecture 101.
     
  6. ted655
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    ted655 Senior Member

    For what I want in a boat it is a lump, BUT it would help all of us know what purpose YOU want it to serve. Against what use are we to comment? If it is a speed boat, it's a pig. If it is to turn heads, it is superb.
     
  7. lewisboats
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    lewisboats Obsessed Member

    Me thinks the originator has taken a powder...not liking the results of this post mayhap?

    Steve
     
  8. rwatson
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    rwatson Senior Member

    Wow - he got evreyone wound up, and you are still all biting.
    You old science fictions fans may recognise the design and name from a very old science fiction book of ficticious space ship designs - no wonder it doesnt compute as a boat design.
    lets just let the fun die down, and save disk space on this otherwise valuable forum. Vale Fat Boy
     
  9. ted655
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    ted655 Senior Member

    My life is already too complicated to do anything but take people @ face value. If they have other agendas other than honesty, that's on them, not us!
     
  10. Buckie
    Joined: Nov 2006
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    Buckie Junior Member

    FAT BOY looking slimmer underside anyhow...

    WOW Great help guys, the lads in the shop were welcomed the advice too.
    FAT BOY has been on a diet below the waterline giving it a low to shallow V front end and a rounded backend. The calculations from the tec guys were given as such....Top Speed wih 1 person umlaiden is 125-cruise 85 mph, 4 persons fully laiden 90- cruise 55, water test showed plaining within 15-25 seconds. driven by 2 900 SC Mercruiser motors, 200 galtank. (although I dont quite know how they came to what seem big motors for the test results.

    Boat One.jpg

    Any how guys thanks for your input I thought we would be building it by now but been told it will be next summer before design work is finished....oh well I can wait as I've excited to be part of it at least...Oh does it look better, sorry thats what I meant to ask first...LOL

    cheer;s
    buckie
     
  11. PAR
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    PAR Yacht Designer/Builder

    Well, you've moved from cartoonish to the realm of almost reasonable, with your latest sketch. I do think the "tech guys' you've employed, are pulling your keel in their assessment of her performance envelope. Frankly, they're blowing smoke up your butt.

    Is there a reason behind the bulbous portion of hull V-ing down the centerline? This shape could plane with enough power, but couldn't stay there for long before falling off (read a few seconds at a time), Lord knows how high that bow will be pointing when you do get her on plane.

    You hull is beginning to take on a more conventional V form, which should be your primary goal. That is removing unnecessary hull volume and reconfiguring this volume in places where it will serve the boat and to hell with styling. The basic functions have to be achieved first, then you can screw around with things to see how it affects those basic functions.

    Have a look at other, mid size powerboats that can achieve 106 - 107 knots. You'll note a few different trains of thought and many similarities. It's not because they don't want the styling, but that they are limited by the dynamics and physics of boats propelled to these speeds. Find one you like, study the principles they incorporated and develop a new boat, based on these well founded principles. Anything less is folly and should be left to disgustingly wealthy fools or those interested in dieing during sea trials.
     
  12. rwatson
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    rwatson Senior Member

    Good advice to Buckie, PAR, but there is no such thing as 'disgustingly wealthy' to a boat shop, and directing smoke into suitable orifices is now a mandatory unit in Boat Yard Managers 101.
    Some schools of thought would say any boat not built for fishing or other utilitarian purpose is being built by someone "disgustingly wealthy" :)
    Oh, by the bye, anybody else notice how the boat width on the plan doesnt quite match the profiles by almost 100% ? Looks like the designer is gradually laying on a dose of reality to the rich client in digestible stages. For my money, the silly underwater fins will be next to go.
    That classic line -
    "I thought we would be building it by now, but been told it will be next summer before design work is finished" - needs to be plated in gold. It takes a few years and a few boats to appreciate that bit of humour.
    Keep up the good work Buckie - still a few more bites to be had out of the group yet.
     
  13. Basjan
    Joined: Sep 2007
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    Basjan Basjan

    Hi all.
    I'm quite new to this forum and don't know much about designing boats, but that top view looks fine. The keel is definitely going to play havoc with your props and that bloated sides reminds me of a hover craft.
    Try putting the deck (top view) on a RIB or deepvee hull and you'll be on the way to a workable boat.
    If that doesn't do it
     
  14. messabout
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    messabout Senior Member

    Buckie; Sorry that most of us do not assign much value to stylism. It is a near certainty that you do not know much about boat design...or you are merely clowning around with the forum members. Know this: Your advisors are full of bovine excrement.

    Run, do not walk to the nearest bookseller. Buy some copies of boat design books. A fundamntal one is Dave Gerrs' The Nature of Boats. After you have digested that one, then study Skenes' Elements of Yacht Design. Howard Chapelles' Yacht designing and Planning is also good. There are more such as the Marchaj set. When you have done the books you can give the finger to those people who are telling you about 105MPH. After that, get back to us and offer up a serious design instead of a prurient sketch.
     

  15. Buckie
    Joined: Nov 2006
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    Buckie Junior Member

    FAT BOY final changes....

    Messabout M8, I'm far from massing about with members, if you had followed the thread from the beginning you would have seen how this is taking shape....true though, I don't know a lot about boats, although I'm learning pretty quick. I work alongside some of the best designers in the business, and at 19, I've been told I shall aspire well, have an eye for future trends.... This is no joke, I'm supposed to be doing this on my own, but I've been taking advice from the forum members whom I think are very experienced and knowledgeable in this fine art.
    The way I see it is you basically have 2 choices a shallow V or a deep V hull, what I'm trying to do is not re-invent the wheel but make it more desirable, and try to combine speed with stability with a new design.
    Before I came up with the changes I made the boys in the shop had already altered it as much as they would allow, as I won the design, because of the flair shown in the original design, so to change it into a run of the mill cruiser would be an unfair way to have won the competition, it at least, must resemble the original in some way, although modification is allowed, as its a learning curve.
    Below are the added enhancements made by the team, but on looking at the advice given in this forum, the guy's here are spot on, and therefore must know what they are talking about, just as I imagined. I would not waste forum space nor members time with pranks....
    The design is now being moved from scraps of paper to Rhino, which I will also be part of....I’ve shown the colour scheme too, I suppose it too may need tinkering with but that’s for another time.
    I thank everyone who has added input both educational and mockery, I’ve big shoulders, I can take it, I’ll keep everyone informed if they want of the development of Fat Boy, although the name too may have to be altered....

    Buckie :p :p :p

    boat2a.jpg
     
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