A design for a hovercraft is shown in the figure. A fan brings air at 60F into a

Question

A design for a hovercraft is shown in the figure. A fan brings air at 60F into a chamber, and the air is exhausted between the skirts and the ground. The pressure inside the chamber is responsible for the lift. The hovercraft is 15 ft long and 7 ft wide. The weight of the craft including crew, fuel, and load is 2,000 lbf. Assume that the pressure where the air exits around the skirt is atmospheric. Assume that the air is incompressible, the flow is steady, and viscous effects are negligible. Find the airflow rate (in cfm) necessary to maintain the skirts at a height if 3 inches above the ground.

Explanation / Answer

A=15*7
change in pressure =W/A

p1 + (rho)*(V1^2/2)=p2+(rho)*(V2^2/2)

V1=sqr root(2(p2-p1)/rho))

Q=V1*A

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