While steaming at 17.5 knots, your vessel consumes 378 barrels of fuel oil per day. In order to reduce consumption to 194 barrels of fuel oil per day, what is the maximum speed the vessel can turn for?
⢠Relationship between speed and fuel consumption for displacement vessels ⢠How power (and fuel use) varies with speed, often using a cube or square law in exam problems ⢠Setting up a proportion (ratio) between the two operating conditions
⢠How does required power (and therefore fuel consumption) typically change when a displacement vessel changes speed? Is it linear, squared, or cubed? ⢠If fuel use at 17.5 knots is 378 barrels/day, how can you express the new (unknown) speed and 194 barrels/day in the same mathematical relationship? ⢠Once you write the proportion, what algebraic steps do you take to isolate the new speed and then compare it to the answer choices?
⢠Be clear whether the exam expects fuel consumption â speedÂł (very common powerâspeed assumption) or a different powerâspeed relationship stated in your study materials. ⢠Doubleâcheck your ratio setup: high-speed condition on one side, low-speed condition on the other, with the correct exponents. ⢠After solving for speed, make sure the result is reasonable: with roughly half the fuel, should the speed be just slightly lower, or significantly lower?
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