Question

Your groundspeed is 360 knots and your fuel flow is 1,420 pounds per hour. Using these rates, how much fuel will you need to fly 500 NM?

a. 1,490 pounds.
b. 1,650 pounds.
c. 1,970 pounds.
d. 2,750 pounds.

Answer 1

To fly 500 NM with a groundspeed of 360 knots and a fuel flow rate of 1,420 pounds per hour, approximately 1,720 pounds of fuel will be needed.

Step-by-step explanation:

To determine the amount of fuel needed to fly 500 NM, we need to first calculate the flight time. Using the groundspeed of 360 knots, we convert it to NM per hour by multiplying it by 1.15 (1 NM = 1.15 knots). So the groundspeed is 414 NM per hour. To calculate the flight time, we divide the distance (500 NM) by the groundspeed (414 NM/h) which equals approximately 1.21 hours.

Now, we can calculate the fuel needed by multiplying the fuel flow rate of 1,420 pounds per hour by the flight time of 1.21 hours. This gives us a total fuel consumption of approximately 1,720 pounds. Therefore, the correct answer is option d. 2,750 pounds, as none of the given options match the calculated value.