New Rib

Discussion in 'Boat Design' started by grp.boat, Nov 23, 2006.

  1. grp.boat
    Joined: Nov 2005
    Posts: 47
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    Location: uk

    grp.boat Junior Member

    I have made a 1:4 scale model of a 7mtr rib which i want to build early next year. The full size rib will weigh approx 500kg.
    Should the model hull weigh 125kg? which is a quater of the weight....

    :confused: :confused: :confused: :confused:
     
    grp.boat, Nov 23, 2006
    #1
  2. RANCHI OTTO
    Joined: Apr 2005
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    RANCHI OTTO Naval Architect

    Weight model = Weight full scale / (scale)^3

    W model = 500 / (4)^3

    W model = 7.81 kg
     
    RANCHI OTTO, Nov 23, 2006
    #2
  3. grp.boat
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    grp.boat Junior Member

    thanks rancho.

    what does ^ mean?
     
    grp.boat, Nov 24, 2006
    #3
  4. RANCHI OTTO
    Joined: Apr 2005
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    RANCHI OTTO Naval Architect

    ^ means exponent....

    (4)^3 means 4x4x4
     
    RANCHI OTTO, Nov 24, 2006
    #4
  5. grp.boat
    Joined: Nov 2005
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    grp.boat Junior Member

    so if i want to build a model of a 800kg boat. It should weigh 12.5kg?

    :D

    i still don't understand the ^ 4x4x4

    :confused:
     
    grp.boat, Nov 25, 2006
    #5

  7. RANCHI OTTO
    Joined: Apr 2005
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    Location: TRIESTE (ITALY)

    RANCHI OTTO Naval Architect

    Bravo...right !
    4^3 means 4 exponent 3 = 4 x 4 x 4

    4^2 means 4 to square = 4 x 4 = 16

    More than that I can't explain, I'm sorry....
     
    RANCHI OTTO, Nov 25, 2006
    #6
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