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Thread: Atkin inboard utility, diesel

  1. #1
    Join Date
    Aug 2018
    Location
    South SF Bay Area
    Posts
    71

    Default Atkin inboard utility, diesel

    I really enjoy sifting through the Atkin catalogue, especially the inboard utilities. What considerations would have to be made to fit a diesel of comparable horsepower to Atkin's design in one of these designs (say, 'utility')? What performance ramifications would there be?

    http://www.atkinboatplans.com/Utilities/Utility.html

    Sent from my ONEPLUS A6003 using Tapatalk
    16'5" Welsford Walkabout

  2. #2
    Join Date
    Mar 2007
    Location
    East Quogue,NY
    Posts
    20,901

    Default Re: Atkin inboard utility, diesel

    A modern engine of either type may be lighter than the equivalent was in Atkins's day. You may need to add some ballast. It depends.

    As for installing diesel versus gas, you can probably downsize in hp by 25-30-percent and achieve similar performance. Diesel's greater torque will allow for spinning a bigger prop ( make sure there is enough aperture). So if a 30-hp gas engine is called for, a 20 or so diesel should deliver roughly equivalent performance.

    Kevin

    Kevin
    There are two kinds of boaters: those who have run aground, and those who lie about it.

  3. #3
    Join Date
    Aug 2018
    Location
    South SF Bay Area
    Posts
    71

    Default

    Thanks Kevin. I did a ROM analysis on more specific example: 'wakeful' is specified with a max 40hp plant turning at 2000 rpm, and weighs 520lb. A beta 38 makes 38 at 3600 rpm, and weighs just 375lb. If there's room for a larger prop, this seems like a compelling possibility to me.

    Sent from my ONEPLUS A6003 using Tapatalk
    16'5" Welsford Walkabout

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