floation facter fluid ounces to cubic inches

Discussion in 'Wooden Boat Building and Restoration' started by rasorinc, Oct 28, 2012.

  1. rasorinc
    Joined: Nov 2007
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    Location: OREGON

    rasorinc Senior Member

    My 70+++year old brain is letting me down today on what should be a simple math question.
    KNOWN FACTS: 1 fluid ounce is 1.8046875 cubic inches
    64 fluid ounce plastic bottle holds 115.5 cubic inches
    ( 64 x 1.8046875 = 115.5 C" )= 1/2 US gallon
    1 US gallon has 231 cubic inches
    1 cubic foot has 1728 C" and if it is air will float 62
    lbs in fresh water.
    So what will my empty 64 oz. plastic bottle float????????? Back again. I just divided 231 by 1728 and got 13.36 so 231 is 13.36% of a cubic foot. 62 lbs. flotation x 13,36% = 8.28 pounds of flotation 1/2 of that is 4.14 pounds of flotation. Is that correct????

    I know it is simple division and multiplication but I've tried every way and nothing adds up. Please Help, Thanks much, Stan
     
    Last edited: Oct 28, 2012
  2. txriverrat
    Joined: Sep 2010
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    txriverrat Senior Member

    I gallon of water weighs 8.35 lbs so that is what iit will float
    Ron
    I know atmosferic presure will very this a minute amount
     
  3. rasorinc
    Joined: Nov 2007
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    Location: OREGON

    rasorinc Senior Member

    My empty 64 ounce bottle is equal to 1/2 gallon so it will float 4.17 lbs.?????
     
  4. PAR
    Joined: Nov 2003
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    PAR Yacht Designer/Builder

  5. Submarine Tom

    Submarine Tom Previous Member

    Simply convert your knowns to metric and it will all be MUCH easier.
     

  6. rasorinc
    Joined: Nov 2007
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    Location: OREGON

    rasorinc Senior Member

    Thanks everyone, I think I have it figured out now. Tom, I'll learn metric when you learn to draw in LeRoy. I really appreciated the asistance.
     
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