ce downflood angle

Discussion in 'Class Societies' started by Guest62110524, Apr 27, 2009.

  1. Guest62110524

    Guest62110524 Previous Member

    is there a minimum downflood angle for CE class C , and is there a min vas,
    I know abt the min downflood height the boat is 13.77 loa 13.46 dwl
    have at mo downflood 39 at sliding door, vas 80
    thanks v muchely
     
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  2. TeddyDiver
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    TeddyDiver Gollywobbler

    I'm not quite sure but believe there is 30 deg. Maybe someone can verify or give the right info..
     
  3. Guillermo
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    Guillermo Ingeniero Naval

    No, it's not 30ยบ but I cannot remember now. When I come back to the office I'll check and post (If nobody popped up with the correct answer before).

    Cheers
     
  4. Ad Hoc
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    Ad Hoc Naval Architect

    are you talking about a boat classed as "inland" waterways, or "coastal" class C boat?..ie EU inland waterway zone 2?

    Guillermo
    It is related to freeboard, not an angle...but is dependent upon the boats length
     
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  5. Guest62110524

    Guest62110524 Previous Member

    thanks yes 1/17 of wl I think, it complies there at .830mm, wl 13.5 class c can be coastal to some sea state
     
  6. Ad Hoc
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    Ad Hoc Naval Architect

    If your vessel is 'sea going' ie not inland waters ways then:

    They must have a freeboard to downflooding of not less than 600 mm for vessels of 7 metres in length or under and not less than 1050 mm for vessels of 18 metres in length or over. For a vessel of intermediate length the freeboard to downflooding should be determined by linear interpolation.

    From 12.2.2 of THE SMALL COMMERCIAL VESSEL AND PILOT BOAT CODE OF PRACTICE
     
  7. Guest62110524

    Guest62110524 Previous Member

    yes thanks, Gulliermo told me that as did a mate in Nl, what abt vas?
     
  8. Ad Hoc
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    Ad Hoc Naval Architect

    what is "vas"..?
     
  9. Guest62110524

    Guest62110524 Previous Member

    angle vanishing stability
     
  10. Ad Hoc
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    Ad Hoc Naval Architect

    Unless you're boat is capabale of lifting cargo of sorts, there is no 'vas' requirement.
    However, the 'range of stability' where the GZ must be positive is given in the table.
     

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  11. Guest62110524

    Guest62110524 Previous Member

    to those with interest
    for power craft there is no angle vanishing stabilty requirement, only for sailing vessels the odd thing is that our local guy is asking for inclining test when it can all be done in Hydromax
     
  12. Guillermo
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    Guillermo Ingeniero Naval

    Stu,
    You need to perform a stability test to accurately determine displacement and CoG position. Then you feed Hydromax or whatever other program with such data to check the fullfilment of the mandatory criteria at the different load conditions.

    Cheers.
     
  13. Guest62110524

    Guest62110524 Previous Member

    oh darn!!! I was hoping to fiddle the books, tee hee its ok dont that a few times, surveyer used to put sandbags at certain height and at 2/3rd beam to determine the number of pax. that my water taxis could seat, as you can see I ran a very tidy place, always chaotic near launch time
     
    Last edited: Jun 21, 2010
  14. Ad Hoc
    Joined: Oct 2008
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    Ad Hoc Naval Architect

    "...the odd thing our local guy is asking for inclining test when it can all be done in Hydromax.."

    To suggest that an inclining expt can be done in a computer program speaks volumes!...
     

  15. Guest62110524

    Guest62110524 Previous Member

    you can put any cog you like in there, but you have to prove it, physically
     
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