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Help hotdog

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  • 27 Oct 2020 07:24
    Reply # 9327907 on 9327660

    Hi Jeffrey,

     according to my rough calculations the 6 inch mast in 6061 T6 aluminium should give a working stress safety factor of about 2.5, which should be OK for most applications. The ultimate stress safety factor is over 3. If using 6063 T6 then the working stress safety factor would only be about 1.5 which would not be adequate.

    All the best with the project, David.

    Last modified: 27 Oct 2020 21:15 | Anonymous member
  • 27 Oct 2020 01:03
    Message # 9327660

    The split junk going by the name "hot dog" is really starting to take shape. The cabin ceiling  is reinforced. The bolk heads and flooring are cut out and just waiting for better weather to glue in.

    It is a contessa 26 with a 305 square foot split junk rig design. This is my first build and I will have many more questions in the very near future. I am going to stick them all into this heading as to better keep track of it all. Know that I spend many days looking through this website and reaching as much as possible before reaching out for help. Thanks in advance for all of the time and effort that everyone puts onto this sight. Thanks a million!


    So... I am trying to get an idea of a proper size mast. I did the math (my little sister might have helped a little). The 6 in OD with 1/4 in wall will not meet my safety factor. So do I look at 8 in. OD with thinner wall or stick with the 6in with heavy wall? I'm leaning towards the 8in option. As I would like to take this boat around the world and back.


    Hear are the status i am working with.(open to interpretation)

    Boat length-25'6"

    Length at water line-20ft

    Beem-7'6"

    Keel-long

    Displacement-5400lbs

    Righting moment-178???

    LR-.533m???

    Max righting moment-1306???


    So what would y'all recommend? 

    PS. I'm working with 6061 tapered aluminum

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