If static pressure of flow is 1200psf and operating Mach number is 1.19 then, determine the external flow dynamic pressure.

A)
12.89 psf
B)
112 psf
C)
1189.52 psf
D)
2587 psf

Correct Answer :   1189.52 psf

Explanation : Dynamic pressure = 0.7*static pressure*Mach number2
= 0.7*1200*1.192 = 1189.52 psf.

Recently Updated in Aircraft Design Questions
If stall speed is 120 knots then, find average velocity at flare.
A)
110.25
B)
125.4
C)
137.5
D)
147.6

Correct Answer : Option (D) :   147.6

Explanation : Average velocity at Flare = 1.23*stall speed = 1.23*120 = 147.6 knots.

Find the approach speed for military aircraft. Considered stall speed is 22unit.
A)
12 ft
B)
20 m
C)
26.4 unit
D)
45 unit

Correct Answer : Option (C) :   26.4 unit

Explanation : For military aircraft, Approach speed = 1.2*stall speed = 1.2*22 = 26.4 unit.

For military aircraft touchdown speed is 100 knots then, approximate value of stall speed.
A)
90.90
B)
100
C)
200
D)
223

Correct Answer : Option (A) :   90.90

Explanation : Stall speed = touchdown speed/1.1 = 100/1.1 = 90.90.

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