While steaming at 16.5 knots, your vessel consumes 349 barrels of fuel oil per day. In order to reduce consumption to 189 barrels of fuel oil per day, what is the maximum speed the vessel can turn for?
⢠Fuel consumption varies with approximately the cube of the speed for displacement vessels ⢠Relationship between old speed / new speed and old consumption / new consumption ⢠Converting barrels per day ratios into a speed ratio
⢠How does a reduction in fuel consumption affect speed if consumption is proportional to the cube of speed? ⢠Can you set up a proportion using (Speedâ / Speedâ)Âł = (Consumptionâ / Consumptionâ) and solve for the unknown speed? ⢠After finding the theoretical new speed, which answer choice is closest to your calculated value?
⢠Confirm you are using the cube relationship between speed and fuel consumption, not a linear one ⢠Compute the consumption ratio (349 / 189) carefully and carry enough decimal places ⢠After solving for the new speed, check that the new speed is less than 16.5 knots and that the direction of change (slowing down) matches the reduced consumption
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