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Calculating Ship's Maximum Speed To A Desired Fuel Consumption Per Day

While steaming at 15 knots, your vessel consumes 326 barrels of fuel oil per day. In order to reduce consumption to 178 barrels of fuel oil per day, what is the maximum speed a vessel can turn for?

Given:

   Old Consumption = 326 bbls
  New Consumption = 178 bbls
             Old Speed = 15 kts

What is asked?

New speed

Solution:  


                     New Consumption = New Speed3
                       Old Consumption   Old Speed3

New Speed3 x Old Consumption = New Consumption x Old Speed3



New Speed3 x Old Consumption = New Consumption x Old Speed3
                       Old Consumption         Old Consumption

New Speed3 x Old Consumption = New Consumption x Old Speed3
                       Old Consumption         Old Consumption

                              New Speed3 = New Consumption x Old Speed3
                                                             Old Consumption
                                                 
                                                 = 178 x 153
                                                                               326
                                                 = 178 x 3375
                                                           326
                                                 = 600750   
                                                         326
                              New Speed3 = 1843      Apply cube root to both sides

                          ³New Speed3 = ³1843 
                              

                                New Speed = 12.2 knots

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