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  1. #1
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    Hull design and 3D CAD modeling

    As I mentioned in my other thread, I am very interested in high performance boat design. Since I bought my boat and have been saving up for parts, I have been playing around with some design work in my spare time. This is a 17ft v-hull I've been working on for a little while. I started out plugging random dimensions and numbers into the Tunnel Boat Design Program, and made changes/tweaked it until I got good (as far as I'm concerned) performance predictions. Then I drew it in Rhino3d to see what it would look like if built. Target hull weight is 450lb (wood), and from the program's outputs, it will have a top speed over 100mph with reasonable (not a drag boat but looks good to me) acceleration too, with a 200hp outboard. Please excuse the watermarks in some of the pictures, I used a trial version of Flamingo nxt for the rendering, as I can't afford to purchase the whole program right now. Hope you guys like it.







    Bluewater Racing F1 #14
    Scycraft F1 Tunnel
    Chris Craft Scorpion 230 - For Sale
    1989 Ski Challenger inboard ski boat
    10' Super Sparton outboard hydroplane

  2. #2
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    I spent way too much time looking for a CAD drawing of an outboard to download, with no luck, so decided to make my own. 12" mid, hole pattern on the clamp bracket matches the transom of my Scycraft, and the lower was drawn using dimensions given in the TBDP for an ssm#6, complete with a 1" dia 13 spline prop shaft. Just went with my imagination for the cowl, including the raised lettering logo (also spent way too much time on that haha). It all started out as a VERY rough wire frame, and I'm pretty happy with what it turned into. Every race engine needs some carbon fiber and chrome!







    Bluewater Racing F1 #14
    Scycraft F1 Tunnel
    Chris Craft Scorpion 230 - For Sale
    1989 Ski Challenger inboard ski boat
    10' Super Sparton outboard hydroplane

  3. #3
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    Put them together in the water, just guessed on the waterline.





    Bluewater Racing F1 #14
    Scycraft F1 Tunnel
    Chris Craft Scorpion 230 - For Sale
    1989 Ski Challenger inboard ski boat
    10' Super Sparton outboard hydroplane

  4. #4
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    Very cool! I'm curious as to how to do that with some of my designs, you mentioned the tunnel boat design program? where did you accuire that? I really know nothing about CAD, but would like to learn. without sounding like a caveman could you explain it in a way an old guy could get the jist of what procedure you went through to do that, ugg ugg?
    most overnite successes usually take at least 10 years


    Certified turd polisher,

  5. #5
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    Thanks! I purchased the Tunnel Boat Design Program (TBDP) from AeroMarine Research. It is really easy to use and covers just about every detail of what ever hull you are working on. If you Google: Aeromarine research, there's a lot of info about the program on their website. Basically, you enter all of the dimensions/weight placement, power, etc. (there are also templates/examples in the program to compare to) and it will give you max speed, acceleration, stability information (porpoise etc). and you can change the design until you are happy with it.

    Bluewater Racing F1 #14
    Scycraft F1 Tunnel
    Chris Craft Scorpion 230 - For Sale
    1989 Ski Challenger inboard ski boat
    10' Super Sparton outboard hydroplane

  6. #6
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    To actually create a model of the hull I use Rhino3d (http://www.rhino3d.com/). I take the hull dimensions from the TBDP and make a simple wire-frame (drawn in the orthogonal views as you would on paper) to get the basic shape. Then I use those curves to create surfaces of the hull. Once you have the basic shape made, it's just a matter of stretching/tweaking, and making small changes until it looks the way you want. I usually start with the transom profile, then draw the outline of the deck, then keel line and chines to get a basic hull shape. It sounds complicated but if you can visualize what you want, and take the time to become familiar with the tools and commands (that's the hardest/most time consuming part) it becomes relatively simple, more time consuming than it is difficult.

    Bluewater Racing F1 #14
    Scycraft F1 Tunnel
    Chris Craft Scorpion 230 - For Sale
    1989 Ski Challenger inboard ski boat
    10' Super Sparton outboard hydroplane

  7. #7
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    <!--[if gte mso 9]><xml> <w:WordDocument> <w:View>Normal</w:View> <w:Zoom>0</w:Zoom> <w:TrackMoves/> <w:TrackFormatting/> <w:PunctuationKerning/> <w:ValidateAgainstSchemas/> <w:SaveIfXMLInvalid>false</w:SaveIfXMLInvalid> <w:IgnoreMixedContent>false</w:IgnoreMixedContent> <w:AlwaysShowPlaceholderText>false</w:AlwaysShowPlaceholderText> <woNotPromoteQF/> <w:LidThemeOther>EN-CA</w:LidThemeOther> <w:LidThemeAsian>X-NONE</w:LidThemeAsian> <w:LidThemeComplexScript>X-NONE</w:LidThemeComplexScript> <w:Compatibility> <w:BreakWrappedTables/> <w:SnapToGridInCell/> <w:WrapTextWithPunct/> <w:UseAsianBreakRules/> <wontGrowAutofit/> <w:SplitPgBreakAndParaMark/> <wontVertAlignCellWithSp/> <wontBreakConstrainedForcedTables/> <wontVertAlignInTxbx/> <w:Word11KerningPairs/> <w:CachedColBalance/> </w:Compatibility> <m:mathPr> <m:mathFont m:val="Cambria Math"/> <m:brkBin m:val="before"/> <m:brkBinSub m:val="&#45;-"/> <m:smallFrac m:val="off"/> <m:dispDef/> <m:lMargin m:val="0"/> <m:rMargin m:val="0"/> <m:defJc m:val="centerGroup"/> <m:wrapIndent m:val="1440"/> <m:intLim m:val="subSup"/> <m:naryLim m:val="undOvr"/> </m:mathPr></w:WordDocument> </xml><![endif]--> To render (basically just make it look nice and take a picture of your hull) the final model, Flamingo works great and is super easy to use. You can download a trial version (like I did) for free and it works as a plug-in for rhino. It's as simple as selecting surfaces and choosing materials and colours from the library. Then just click render and it gives you a realistic image of your design, like I posted above.

    Once you figure out how to use the programs, it just takes time and creativity.

    Hope that helps.

    Morgan

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    Bluewater Racing F1 #14
    Scycraft F1 Tunnel
    Chris Craft Scorpion 230 - For Sale
    1989 Ski Challenger inboard ski boat
    10' Super Sparton outboard hydroplane

  8. #8
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    Sorry for the multiple posts, it wouldn't let me do it all as one for some reason.

    Bluewater Racing F1 #14
    Scycraft F1 Tunnel
    Chris Craft Scorpion 230 - For Sale
    1989 Ski Challenger inboard ski boat
    10' Super Sparton outboard hydroplane

  9. #9
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    thanks !!!!!!!!!!!!!!!!! no you are very informative! the "creative" part is my strong point. life is the only thing hindering me but I'm getting past that, thanks again, fun out

    (gotta eat now)
    most overnite successes usually take at least 10 years


    Certified turd polisher,

  10. #10
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    Sweet mwe, now you build a model then the real thing.
    ARGO Cat 18'
    Mercury 2.4EFI/CLE
    ------------------------------------
    If it's not a cat it's a.............dog ?



  11. #11
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    Very cool. Check out http://www.berserkdesign.com/index.htm

    He's based in Sweden I think but has done designs for several successful British & European race boats.

    Bernico's stuff in Belgium is all CAD designed & evaluated now too, and the plugs machined from massive chunks of clay


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    I didn't like it at first but when ya put it in the water, wow, I like it. great work. I don't know how to do cad either nor have the money to buy but sure wish I had something like that when I redesigned my Ace runabout. I have the model almost done. need to water test it with some weight in it to see how it will float.
    hope you take the time to build a model of it. would be interesting to see.

    Outlaw

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    That clip is nothing to do with the actual modelling or design work, I think it was a simple concept for a game. Voxdale used computer simulation for aero and hydro-dynamic work. Clever stuff


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    Thanks guys! And mr fun, glad I could help. mariawhitetrash, I am familiar with Berserk Designs and Bernico. I actually stumbled across Bernico a while ago when looking at pictures for pad ideas for another hull I did a couple years ago. Since I plan on building a hull out of wood, I was trying to figure out the simplest way to transition from the flat pad to the v further forward, and since it's more difficult to blend plywood surfaces together nicely than it is with fiberglass, this is what I came up with (before finding the Bernico boats)



    Not the best picture but you can see the small step at the front of the pad.

    When I saw the Bernico F2 (and F1 GTS shown on their website), the first thing I noticed was the step between the v at the front and the flat pad.
    I thought it was really cool to see that some crazy idea I had a couple years ago could actually work, and is being used, successfully.

    For anyone else interested, this isn't my video but it shows the step pretty well:

    http://www.youtube.com/watch?v=nMqTu2BF_Jk

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