Weight Estimate

Discussion in 'Boat Design' started by Farley, Apr 15, 2011.

  1. Farley
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    Farley Junior Member

    Does anyone have any data on the weight components of a 30m monohull?

    the weight estime is a relatively important factor to a good design and the one i have done is down 18 tonnes!

    the vessel is going to be a research vessel, monohull, 10 persons on board. aluminium construction.

    the structure i have calculated but i know little about more random facets that make up a boat such as the electrics. all i could find was this





    Thanks for any help offered
     

    Attached Files:

  2. daiquiri
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    daiquiri Engineering and Design

  3. Ad Hoc
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    Ad Hoc Naval Architect

    Indeed it is. It forms the whole design whether it shall succeed or fail.

    However, you need to be a bit more specific....what type of 30m monohull...L/B ratio plays a part...as does speed...so does which rules and regulations....payload....what is the SOR etc etc. Otherwise it is like comparing a mini with a ferrari..they both have 4 wheels, both are cars both carry passengers etc....


    This "simple" mono hull, of 30m LOA has the following:

    Group 1 Hull = 24 tonne
    Group 2 Propulsion = 10 tonne
    Group 3 Electrics = 4 tonne
    Group 4 Comm. & Control = 1 tonne
    Group 5 Aux. Systems = 6 tonne
    Group 6 Outfit = 8 tonne
    Group 8 Fluids = 0.5 tonne

    Margin 5% = 2.5 tonne

    So the total lightship is around 55 tonne.

    This is for a mono of L/B =5
    Top speed 25 knots
    Carrying 35 tonne cargo.

    This might help..

    But you wont get too many weight sheets available publically.
     
  4. Farley
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    Farley Junior Member

    research monohull, specs are
    LOA = 30
    BOA = 6.7
    Tc = 1.8
    top speed = 20 knots
    displacement = 123 tonnes.
    Aluminum hull and superstructure
    IMO and SSC
     
  5. Ad Hoc
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    Ad Hoc Naval Architect

    The figures i quoted above the full load is 120tonne, so similar to your 123 tonne.

    Big differnece is the machinary...more than double...so that can't be correct!...and a crazy amount of fuel too.

    Otherwise rest is not far off.
     
  6. daiquiri
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    daiquiri Engineering and Design

    I'm sorry, didn't read your post correctly. You were actually asking for a weight breakdown, while the links above give only total operative weight of different ships. My fault :eek:
     
  7. Kobus Potgieter
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    Kobus Potgieter Naval Architect

    Just done a design now and completed the construction of a 30m Patrol ALU boat.
    view www.navaldesign.co.za
    They weight (Full displacement) came in at 110 T.
     
  8. DCockey
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    DCockey Senior Member

    Are you a student?
     
  9. Doug Lord
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    Doug Lord Flight Ready

    =======
    Yes, he is:

    22-2011, 07:41 AM
    Farley
    Junior Member Join Date: Jan 2011
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    Location: Austria

    I have been set the task of analysing a sailing yacht's keel using a program my lecturer has made ( it uses ISO 12215)

    For this I need information about a specfice model/yacht's keel configuration.
     
  10. gonzo
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    gonzo Senior Member

    It can be anything. What you have to do, is list every component, including accessories, water, fuel, etc. and add it all up.
     

  11. starich
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    starich Junior Member

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