Mast Moment of Inertia

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

  1. JCD
    Joined: Jul 2006
    Posts: 359
    Likes: 3, Points: 0, Legacy Rep: 36
    Location: Coney

    JCD Follow the Bubbles!

    Hello all,

    I have a "help me decide" question.

    I solved for my required section modulus for the mast as denoted below.

    RM = 91000 ft #’s
    91,000 x 12 = 1,092,000 in #’s
    Aluminum: yield stress 60,000psi, ultimate stress 68,000
    1,092,000 / (60,000 / 3) = 54.6 in^3 = Required section modulus

    That is to be the minimum for the traverse direction...correct?
    In your opinion, which extrusion shape would best fit that modulus for a cruiserperformance catamaran of approximately 450^2 feet of sail with light displacement SDR's of 22 and heavy SDR's of 18? Why and how did you solve for that solution?

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