Section Modulus of Bulb Flats

Discussion in 'Boat Design' started by JCL Design, Mar 3, 2013.

  1. JCL Design
    Joined: Feb 2012
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    JCL Design Designer

    Can anyone provide me with a table for Bulb Flats showing dimensions and the Section Modulus (cm3) for each, I can't seem to find one.

    Thanks
     
  2. Ad Hoc
    Joined: Oct 2008
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    Ad Hoc Naval Architect

    This covers the whole standard range:

    bulbs-2.jpg bulbs-1.jpg

    The width is "b", or the depth, correctly, t = thickness of web, and c = width of "flange" part of the bulb. Where also r1 is the radius of the end part of the flange, and centroid is from the base up the depth of the bulb, ex. All in mm.
     
  3. JCL Design
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    JCL Design Designer

    Thanks Ad Hoc

    However, I require the Z value for the bulb flats in cm3. I was thinking there was a table with this info, if not I would need to calulate it for each one to fine the size I need.

    Cheers,
     
  4. Ad Hoc
    Joined: Oct 2008
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    Ad Hoc Naval Architect

    The data is there, last column.
    (Incorrect units shown).
     
  5. JCL Design
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    JCL Design Designer

    So instead of cm2 it should be cm3. Nice I have seen this before and was confused. Thanks for clearing this up for me.

    Cheers,
     
  6. Hamish_A
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    Hamish_A Member

    The is an extract from the Dent Steel Catalouge you can go on there and download/order your own one of the most useful references on my desk
     

  7. JCL Design
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    JCL Design Designer

    Thank you both for your help.
     
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