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A second propeller has a diameter of 7.5 feet. The airplane is cruising at 135 mph at standard sea level. At these flight conditions, the drag was measured at 312 pounds. Determine the propeller efficiency.

Answer :

Final answer:

The propeller ide is approximately 408.15.

Explanation:

To determine the propeller ide, we can use the formula:

ide = (Thrust / Power) * 100

First, we need to calculate the thrust produced by the propeller. The thrust can be calculated using the drag force:

Thrust = Drag

Given that the drag force is 312 pounds, the thrust produced by the propeller is also 312 pounds.

Next, we need to calculate the power input. The power can be calculated using the formula:

Power = (Force * Velocity) / 550

Where Force is the thrust and Velocity is the speed of the airplane.

Given that the force (thrust) is 312 pounds and the velocity is 135 mph, we can calculate the power:

Power = (312 * 135) / 550 = 76.36 horsepower

Now, we can calculate the propeller ide:

ide = (Thrust / Power) * 100 = (312 / 76.36) * 100 = 408.15

Therefore, the propeller ide is approximately 408.15.

Learn more about determining the propeller ide here:

https://brainly.com/question/32141931

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