Concept explainers
(a)
The minimum safe speed for takeoff and landing with and without extending the flaps.
(a)

Explanation of Solution
Given:
Total mass is 150000 lbm.
Wing area is
Cruising speed is
Altitude is 38000 ft.
Density of air is
Density of air on the ground is
Calculation:
Refer figure 15-45 and obtain the maximum lift coefficient with and without flaps as follows:
During takeoff of the aircraft,
Calculate the stall speed with flaps.
Calculate the stall speed without flaps.
Calculate the safe speed with flaps.
Thus, the safe speed with flaps is
Calculate the safe speed without flaps.
Thus, the safe speed without flaps is
(b)
The angle of attack.
(b)

Explanation of Solution
Calculation:
The lift coefficient is,
From Figure 15-45, the angle of attack corresponding to the lift coefficient is
Thus, the angle of attack is
(c)
The power required to overcome drag.
(c)

Explanation of Solution
Calculation:
From Figure 15-45, the drag coefficient corresponding to the lift coefficient is
The drag force is,
The power required to overcome the drag is,
Thus, the power required to overcome the drag is
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Chapter 15 Solutions
Fundamentals Of Thermal-fluid Sciences In Si Units
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