Lighten hole

Discussion in 'Boatbuilding' started by Brian.Lin, Dec 15, 2010.

  1. Brian.Lin
    Joined: Aug 2006
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    Brian.Lin Junior Member

    Dear Sirs,

    I found there are lofs of lighten holes on the transverse frame.(refer to photo)

    Does anyone know about the principle of cutting the ligthen holes?

    Or, Does any society class have secification about it?
     

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  2. RAraujo
    Joined: Apr 2010
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    RAraujo Senior Member - Naval Architect

    As far as I know all the societies have requirements for cut-outs and lightening holes.

    These are related to shape, location and admissible sizes. In general, and simplifying, it's shape shall not lead to stress concentration and the area and section modulus of the remaining section are to be sufficient to resist the projected loads (shear force and bending moments).

    Attached find an extract of BV Rules for Steel Ships on the subject.
     

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  3. Brian.Lin
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    Brian.Lin Junior Member

    Thx.

    Do the rules also cover aluminum boat´╝č
     
  4. RAraujo
    Joined: Apr 2010
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    RAraujo Senior Member - Naval Architect

    These Rules are for steel ships but the same principles apply to aluminum structures. I've been looking in BV HSC Rules and could not find specific requirements.

    However, due to the special characteristics of welded aluminum, special care is required to avoid points of stress concentrations.
     

  5. Brian.Lin
    Joined: Aug 2006
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    Brian.Lin Junior Member

    hi RAraujo

    thank for your kind help.
     
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