# Question 14.9: A fully loaded aircraft weighing 900 kN has a wing area of 2...

A fully loaded aircraft weighing 900 kN has a wing area of 230 m². If the wing has the characteristics of a NACA 23012 airfoil and during takeoff operates at a 6° angle of attack, what is the required takeoff speed at sea level? What is the takeoff speed at an elevation of 2000 m?

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Question: 14.8

## As shown schematically in Figure 14.31, square columns 4 in. × 4 in. and 10 ft tall are to be used in the construction of a porch in south Florida. If the columns are exposed to hurricane force winds of 100 mph(= 147 ft/s), what force must each column withstand? ...

The Reynolds number of the ﬂow is found to be [lat...
Question: 14.4

## A modern sculpture includes a wind gage in the form of a circular cylinder suspended from two ﬁne wires as shown in Figure 14.21. If the presence of the wires is assumed to have a negligible inﬂuence on the ﬂow ﬁeld, at what angle will the cylinder hang in a wind of 25 km/h? The cylinder weighs ...

Since the wind applies a lift and drag to the cyli...
Question: 14.3

## A playful child left alone has run a vacuum cleaner in reverse, creating a dust cloud. If the cloud consists of 0.001, 0.01, and 0.1 mm diameter particles, and the particle density is 700 kg/m³, will the child be able to clean up the mess by dusting the furniture before her mother returns an hour ...

For a particle settling at terminal velocity, a ve...
Question: 14.2

## A box-shaped truck body 2.5 m wide, 3 m high, and 7 m long (Figure 14.9) is traveling at 20 m/s in 20°C air. Calculate the contributions to the total drag of the truck from the sides and top of the truck body. Assume that a sheet metal seam near the leading edge of each panel causes the boundary ...

We will ﬁrst use Eq. 14.16a to calculate the maxim...
Question: 14.1

## A thin ﬂat plate, 10 ft tall and 1 ft wide, forms the leading edge of a banner towed by an aircraft at 100 mph on a 70°F day. How far from the leading edge of the plate does the laminar portion of boundary layer extend? What is the boundary layer thickness at the downstream end of the laminar ...

The physical arrangement is shown in Figure 14.7. ...
Question: 14.5

## The Flettner rotor-powered ship shown in Figure 14.23A had two rotors, each 3 m diameter and 15 m tall. If ω = 200 rpm and the speed of the wind relative to the rotor is 30 km/h, ﬁnd the force applied to each rotor by the wind. ...

To ﬁnd the force generated by each rotor, we will ...
Question: 14.6