Stiffeners spacing

Discussion in 'Class Societies' started by DUCRUY Jacques, Aug 1, 2010.

  1. DUCRUY Jacques
    Joined: Nov 2009
    Posts: 75
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    Location: france

    DUCRUY Jacques Junior Member

    Hello,

    The ISO or ABS ORY don't impose a maximum space between longitudinal or transverse frame : if you choose a great spacing, you must choose a plating more thick (or a SM more important for stiffeners).

    But I am surprised by the difference between a plywood hull (classic, not epoxy) and a GRP hull.

    For example, on a plywood hull :
    longitudinal spacing : 30 cm
    traverse frame spacing : 60 cm

    On a GRP hull, you can see sometimes only 3 or 4 longitudinals by side, supported only by bulkhead (spacing 2 m).

    Do you know why ?

    Thank you by advance

    Best Regards


    Jacques
     
    DUCRUY Jacques, Aug 1, 2010
    #1
  2. jehardiman
    Joined: Aug 2004
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    Location: Port Orchard, Washington, USA

    jehardiman Senior Member

    Monocoque construction. Rather than compare coventional plywood to GRP, look at a hot molded plywood boat like a wood Thistle.
     
    jehardiman, Aug 2, 2010
    #2
  3. victorship
    Joined: Mar 2009
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    Location: hawaii

    victorship WebMember

    for deck/shell plating, beam, frame, girders and longitudinal... the rules take into account the stiffener spacing to calculate the thickness and section modulus, in order to evaluate buckling/yield criteria. on the other hand the modulus of elasticity and strength of each material make the difference.
     
    victorship, Aug 22, 2010
    #3
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