Final answer:
The optimum fuel consumption for a boat on a plane occurs when the boat is operating at its most efficient speed, known as the planing speed.
Step-by-step explanation:
The optimum fuel consumption for a boat on a plane occurs when the boat is operating at its most efficient speed. This speed, known as the planing speed, is the speed at which the boat's hull lifts out of the water and rides on top of it. At this speed, the boat experiences reduced drag and therefore requires less fuel to maintain its forward motion.
By reaching the planing speed, the boat can achieve higher fuel efficiency compared to operating at lower speeds. This is because at speeds below the planing speed, the boat's hull creates more drag, which requires more fuel to overcome. On the other hand, operating at speeds above the planing speed may also increase fuel consumption due to increased resistance.
So, to achieve optimum fuel consumption, the boat should be operated at its planing speed.
At this speed, the boat's hull lifts out of the water and rides on top of it, resulting in reduced drag and lower fuel consumption.