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  1. #1
    Join Date
    Nov 2006
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    Northern VA
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    Default Build Log: IOM

    IOM 681

    Graham Bantrock designed hull "Vivid"

    What started out as 2 blocks of Dow Corning 4" thick insulation foam. Is now a male plug. Thanks to a good friend for his computer and CAD/CAM/CNC machine, he working on a goth plug.

    my plan is to do what I've done on the Albacore(bilge rat) 6,4,2 ounce glass

    I just finished a hull for a 1920's powerboat(Augusta) using the same glass method. and the bare hull prior to finish sanding/paint is 10.4 ounces... and its 38" long

    being that the iom hull is much skinnier and not nearly as much free board... getting the bare hull with no deck close to 225-250 grams should not be a challenge.

    need to order some more glass before I start glassing though...hate to run out...
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    Marc

    S1M 1981
    Victoria 81
    RG65 181
    IOM 81, 681, 881

  2. #2
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    Default Re: Build Log: IOM

    had enough glass for Vivid Hull #1....
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    Marc

    S1M 1981
    Victoria 81
    RG65 181
    IOM 81, 681, 881

  3. #3
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    L.A.(Eagle Rock) California
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    Default Re: Build Log: IOM

    What would be an ideal weight for a bare IOM hull ?

  4. #4
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    Default Re: Build Log: IOM

    I've been seeing a complete hull with deck and fittings around 500 -800 grams... I figure if I can come in at 225-250 for the hull, adding the deck and fittings should put in the 500-600 gram range...

    old info, but data is data..

    http://www.anderswallin.net/wp-conte...et2003july.pdf

    I put in the transom and bow tonight. so I should have some pics and weights of the bare hull tomorrow..Fingers are still sticky...
    Marc

    S1M 1981
    Victoria 81
    RG65 181
    IOM 81, 681, 881

  5. #5
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    Default Re: Build Log: IOM

    ..................
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    Marc

    S1M 1981
    Victoria 81
    RG65 181
    IOM 81, 681, 881

  6. #6
    Join Date
    Aug 2011
    Location
    Quebec, CANADA
    Posts
    108

    Default Re: Build Log: IOM

    Good and fast work Marc. Thank you for taking the time to share this build with us.

    I am puzzled. How did you come up with a nice and smooth closed transom and bow hull from your opened ends hull? Maybe your pictures are just too low-res to understand your work. I imagine that you preformed the bow and cut the transom out of a plat f/g plate. But your joints seem so perfect!

    Sylvain

  7. #7
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    Apr 2005
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    Toulouse (Fra)
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    Default Re: Build Log: IOM

    Quote Originally Posted by GPZY View Post
    What would be an ideal weight for a bare IOM hull ?
    Hi, it is rather easy to calculate the expected bare hull weight.
    Example :
    Assume a total Hull surface of 28.5dmē
    Assume you will use 3 layers of glass epoxy of 80g/mē
    then :
    Expected weight will be : 0.8g + 0.8g + 0.8g x 2 (for resin) x 28.5 dmē = 136.80g

    The easy way is to weight the tissue shaped for the hull coverage + a margin of ~2cm
    Prepare the epoxy resin for the same weight amount. This is based on the common 50/50 proportion.

    ClaudioD

  8. #8
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    Default Re: Build Log: IOM

    claudio, my vivid was about 100 grams heavier than your estimate... but it was one of the first hulls I made. we'll see how this one fares in the weight department. I'm going to try my hand at peel ply on the hull..
    Marc

    S1M 1981
    Victoria 81
    RG65 181
    IOM 81, 681, 881

  9. #9

    Default Re: Build Log: IOM

    Quote Originally Posted by marcsmith View Post
    had enough glass for Vivid Hull #1....
    Hi Marc! I have just started my first scratch IOM hull. I am very curious of the technique that you used to fiberglass this plug. I think I see that you have strips laid out at an angle and overlapping?
    And from the prior posts that you used different weights of glass, 6,4,2 ounce glass. Is this technique documented anywhere? If not, can you share some of your thoughts on how to best layout the fiberglass?

    Thanks,
    Glenn

  10. #10
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    Default Re: Build Log: IOM

    Glenn

    actually is 6, 2, 1 the 1 ounce is almost silk like in nature...and makes for a nice top coat which is easy to sand...

    the strips you see, is just the packing tape overlaps showing through the wet glass.

    I extrapolated the fiberglass weights from one of claudio posts. Claudio and dick and a few others have used the packing tape method for a while. the packing tape acts like a release agent and keeps the epoxy from bonding to the hull...

    having to sand the hull to remove the fiberglass pattern is probably ly the worst aspect of using a "male plug" method of making a hull...

    I will be working on my first female mold for the keel/rudder.

    I did make a female mold of a keel bulb for an RG 65... I'll take some pics and most later in my albacore post. while not perfect, it needs to be sanded and shaped....
    Last edited by marcsmith; 01-13-2013 at 09:54 AM.
    Marc

    S1M 1981
    Victoria 81
    RG65 181
    IOM 81, 681, 881

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