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    Re: Barrels was DR thread from Nov-Dec '04
    From: Bill B
    Date: 2005 Feb 1, 17:54 -0500

    Doug
    
    Wow!
    
    Regarding:
    
    w = pld displacement
    W = new displacement
    
    Can you further expound on the meaning of the above?
    
    Thanks
    
    Bill
    
    
    
    > Doug
    >
    > George posted a plausible explanation of the cube method, but I have not
    > seen your posting on how a merchant marine would solve the problem.
    >
    > Any hope I will see another way to skin the cat from you?
    >
    > Bill
    >
    >
    >
    > Here you go:
    >
    > s = old speed
    > S = new speed
    > c = old consumption
    > C = new consuption
    > w = pld displacement
    > W = new displacement
    > r = rpm at s
    > R = rpm at S
    > Ve = calculated speed by rpm
    > Vo = observed speed
    > De = calculated distance by rpm
    > Do = observed distance
    >
    > Slip
    > - slip = vessel speed outruns screw speed
    > + slip = screw speed outruns vessel speed
    >
    > by speed
    > % slip = ((Ve - Vo)/Ve) x 100
    > by distance
    > % slip = ((Do - De)/De) x 100
    >
    > Fuel Consumption
    >
    > by displacement
    > log C = (log c + 2/3 log W)- 2/3 log c
    > by speed
    > C =(c x S cubed)/s cubed
    >
    > Speed by RPM
    > speed in Kts = (60 x rpm x pitch x (1 - % slip))/6080
    > rpm at given speed
    > rpm = 6080/((pitch/1 + % slip) x 60) x speed in Kts
    > rpm needed for new speed
    > rpm = (r x S)/s
    
    
    

       
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