Lighten hole

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

  1. Brian.Lin
    Joined: Aug 2006
    Posts: 56
    Likes: 0, Points: 6, Legacy Rep: 10
    Location: TW

    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?
     

    Attached Files:

    Brian.Lin, Dec 15, 2010
    #1
  2. RAraujo
    Joined: Apr 2010
    Posts: 146
    Likes: 37, Points: 28, Legacy Rep: 114
    Location: Singapore

    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.
     

    Attached Files:

    RAraujo, Dec 15, 2010
    #2
  3. Brian.Lin
    Joined: Aug 2006
    Posts: 56
    Likes: 0, Points: 6, Legacy Rep: 10
    Location: TW

    Brian.Lin Junior Member

    Thx.

    Do the rules also cover aluminum boat？
     
    Brian.Lin, Dec 16, 2010
    #3
  4. RAraujo
    Joined: Apr 2010
    Posts: 146
    Likes: 37, Points: 28, Legacy Rep: 114
    Location: Singapore

    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.
     
    RAraujo, Dec 16, 2010
    #4

  6. Brian.Lin
    Joined: Aug 2006
    Posts: 56
    Likes: 0, Points: 6, Legacy Rep: 10
    Location: TW

    Brian.Lin Junior Member

    hi RAraujo

    thank for your kind help.
     
    Brian.Lin, Dec 17, 2010
    #5
Loading...
Similar Threads
  1. Steve13

    Filling in transom holes from sterndrives.

    Steve13, Apr 18, 2024, in forum: Boatbuilding
    Replies:
    7
    Views:
    300
    fallguy
    Apr 21, 2024 at 7:45 AM
  2. TOALL

    filling holes

    TOALL, Jun 20, 2016, in forum: Boatbuilding
    Replies:
    9
    Views:
    3,019
    ElGringo
    Jul 3, 2016
  3. steelsunrise

    Help! Hole above the forepeak!

    steelsunrise, May 25, 2014, in forum: Boatbuilding
    Replies:
    11
    Views:
    3,028
    Yobarnacle
    May 27, 2014
  4. paintbylumbers

    Boring a hole for a pipe

    paintbylumbers, Apr 27, 2013, in forum: Boatbuilding
    Replies:
    9
    Views:
    2,260
    PAR
    Apr 28, 2013
  5. J 29 Guy

    Holes for chain plates cut into redone deck in wrong location

    J 29 Guy, Mar 12, 2012, in forum: Boatbuilding
    Replies:
    8
    Views:
    2,466
    J 29 Guy
    Mar 12, 2012
  6. Subseaoffshore

    Looking for A Stainless Steel Porthole and windows supplier

    Subseaoffshore, May 4, 2011, in forum: Boatbuilding
    Replies:
    0
    Views:
    3,018
    Subseaoffshore
    May 4, 2011
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.