1. At what angle of attack (in deg.) must the airfoil be pitched to obtain zero lift? (answer expressed to the nearest hundredth) 2. At the burble point, what is the value of the lift coefficient? What is the stalling angle of attack (in deg.)? (all answers expressed to the nearest hundredth) 3. From the graphical solution, what is the maximum lift-to-drag ratio? What is the optimum angle of attack (in deg.)? (all answers expressed to the nearest hundredth) 4. Where the lift coefficient varies linearly with the angle of attack, approximate the lift curve slope (per degree, nearest hundredth) 5. For a chord length of 100 cm, determine the following? (all answers are in cm and rounded off to the nearest hundredth)

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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G₂
J
0
0.24
0.4
0.6
0.8
14
1.074
a
deg (°)
-0.90
0.90
34
5.2
7.35
10
124
Сай
0.0106
0.0105
0.01134
0.0125
0.01474
0.01904
0.0280
C₁
Ca
+
a. Camber
b. Position of camber (from leading edge)
c. Thickness
d. t/c ratio
E
0
19.05
35.40
48
54.42
52.63
38.21
E
1
Answer the following questions:
1. At what angle of attack (in deg.) must the airfoil be pitched to obtain zero lift?
(answer expressed to the nearest hundredth)
2. At the burble point, what is the value of the lift coefficient? What is the stalling
angle of attack (in deg.)? (all answers expressed to the nearest hundredth)
3. From the graphical solution, what is the maximum lift-to-drag ratio? What is the
optimum angle of attack (in deg.)? (all answers expressed to the nearest
hundredth)
4. Where the lift coefficient varies linearly with the angle of attack, approximate the
lift curve slope (per degree, nearest hundredth)
5. For a chord length of 100 cm, determine the following? (all answers are in cm
and rounded off to the nearest hundredth)
Transcribed Image Text:G₂ J 0 0.24 0.4 0.6 0.8 14 1.074 a deg (°) -0.90 0.90 34 5.2 7.35 10 124 Сай 0.0106 0.0105 0.01134 0.0125 0.01474 0.01904 0.0280 C₁ Ca + a. Camber b. Position of camber (from leading edge) c. Thickness d. t/c ratio E 0 19.05 35.40 48 54.42 52.63 38.21 E 1 Answer the following questions: 1. At what angle of attack (in deg.) must the airfoil be pitched to obtain zero lift? (answer expressed to the nearest hundredth) 2. At the burble point, what is the value of the lift coefficient? What is the stalling angle of attack (in deg.)? (all answers expressed to the nearest hundredth) 3. From the graphical solution, what is the maximum lift-to-drag ratio? What is the optimum angle of attack (in deg.)? (all answers expressed to the nearest hundredth) 4. Where the lift coefficient varies linearly with the angle of attack, approximate the lift curve slope (per degree, nearest hundredth) 5. For a chord length of 100 cm, determine the following? (all answers are in cm and rounded off to the nearest hundredth)
Hola?
-3
Section lift coefficient, c
3.6
3.2
2.8
2.4
2.0
1.6
12
0
-4
-.8
-1.2
-4 -1.6
-5 -2.0₂
-32
-24
-16
4
-8
0
8
16
Section angle of attack, a deg.
NACA 23018 Wing Section
24
32
Section drag coefficient,
.024
020
016
012
008
004
0
Moment coefficient, casa!
.2
4
-1.2
z/c
Toto 00 to o
.6
to 3.1 x 10⁰.
06.0
089
46.0
-8
.8
1.0
LO
036
032
028
ac position
a/d
wc
TU
236 019
.24
017
243
007
Standard roughness
-4
0 4
Section lift coefficient,
NACA 23018 Wing Section (Continued)
.8
34
1.2
1.6
Transcribed Image Text:Hola? -3 Section lift coefficient, c 3.6 3.2 2.8 2.4 2.0 1.6 12 0 -4 -.8 -1.2 -4 -1.6 -5 -2.0₂ -32 -24 -16 4 -8 0 8 16 Section angle of attack, a deg. NACA 23018 Wing Section 24 32 Section drag coefficient, .024 020 016 012 008 004 0 Moment coefficient, casa! .2 4 -1.2 z/c Toto 00 to o .6 to 3.1 x 10⁰. 06.0 089 46.0 -8 .8 1.0 LO 036 032 028 ac position a/d wc TU 236 019 .24 017 243 007 Standard roughness -4 0 4 Section lift coefficient, NACA 23018 Wing Section (Continued) .8 34 1.2 1.6
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