In 1923, the United States Army (there was no U.S. Air Force at that time) set a

Question

In 1923, the United States Army (there was no U.S. Air Force at that time) set a record for in-flight refueling of airplanes. Using two refueling planes, an Airco DH-4B biplane was able to remain in flight for 38 hours. During the flight, the refueling planes were able to air-transfer a total of 687 gallons of fuel to the plane in 9 refueling transfers. Assume that the refueling nozzle had a diameter of 1.35 inches and each refueling took 2.47 minutes to perform. Calculate the velocity of the fuel through the nozzle. Assume that the fuel filled the entire cross-sectional area of the nozzle.

Explanation / Answer

Hi,

please find the below sollution.

velocity = volumetric flow rate / area

v = (687gal / 9X2.47X60s) X0.133681ft3/gal / (/4)(1.35ft/12)2

v = 6.92 ft/s

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