6. (4) Calculate the lift to drag ratio (n) for the airfoil in figure 1 (end of exam) at a 15° angle of attack. a. b. .45 1.375 .672 с. 15 d. .07 e. 11 -1 -7.
Fluid Pressure
The term fluid pressure is coined as, the measurement of the force per unit area of a given surface of a closed container. It is a branch of physics that helps to study the properties of fluid under various conditions of force.
Gauge Pressure
Pressure is the physical force acting per unit area on a body; the applied force is perpendicular to the surface of the object per unit area. The air around us at sea level exerts a pressure (atmospheric pressure) of about 14.7 psi but this doesn’t seem to bother anyone as the bodily fluids are constantly pushing outwards with the same force but if one swims down into the ocean a few feet below the surface one can notice the difference, there is increased pressure on the eardrum, this is due to an increase in hydrostatic pressure.
![6. (4) Calculate the lift to drag ratio (n) for the airfoil in figure 1 (end of exam) at a 15° angle of
attack.
a.) 2.1
b. .45
c. 15
1.375
675
d. .07
e. 11 -1](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F4a8c1240-bca8-442b-bd7f-985516c397f9%2Ff4b36859-6374-4bf4-94f6-e0ee06e8d599%2F8s8pkk9.jpeg&w=3840&q=75)
![DRAC
COEFFICIENT
30
25
10
20
COEFEIUTENT
Geopotential Height (km)
LIFT
Clark Y airfoll at aspect ratio=6
-1.50-
.30
1.25-
.25
.20
00.
.75
.15
.50
.10
-.25
.05
0.
-5
-10
15
20
5.
ANGLE OF ATTACK
Figure 1: coefficient of lift and drag vs. angle of attack.
Standard Atmosphere Density
16
14-
12
10
8.
6.
4](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F4a8c1240-bca8-442b-bd7f-985516c397f9%2Ff4b36859-6374-4bf4-94f6-e0ee06e8d599%2Fl289anj.jpeg&w=3840&q=75)
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