Question Analysis, Book Reference, Important Concepts, and topic wise Solutions for the topic "Sideslip" are time-stamped below. Access the study materials, presentation, links to previous and next lectures and further information in the description section.

1. FLIGHT MECHANICS
SIDESLIP
TOPIC WISE SOLVED QUESTIONS
Question Analysis | Book Reference | Important Concepts | Formulae | Solutions
1

2. 2
FLIGHT MECHANICS - BASICS
Answer:
(C) is always negative
Explanation:
• Yawing Moment (+N & -N).
o Right Wing going back/ clockwise turn: Positive Yaw
o Left Wing going back/ anti-clockwise turn: Negative Yaw
• Sideslip Angle (+Ve & -Ve)
o Relative wind from right side of aircraft’s nose: Positive Sideslip angle
o Relative wind from left side of aircraft’s nose: Negative Sideslip angle
GATE 2011 Sideslip 1 Mark
Q1. If an aircraft is performing a positive yawing manoeuvre, the side slip angle
(A) is always zero (B) is never zero
(C) is always negative (D) could be any value
- β
V∞
Question Analysis | Book Reference | Important Concepts | Formulae | Solutions

3. 3
FLIGHT MECHANICS - BASICS
Answer: (B) 5.65
Solution:
• Ground speed = Aircraft's true airspeed + wind speed & direction;
Therefore
• Aircraft's true airspeed = Ground speed - wind speed and direction
• [u, v, w] = [100-0, 5+5, 5+10] = [100, 10, 15]
β = sin-1 𝑣
𝑉
; 𝑉 = 𝑢2 + 𝑣2 + 𝑤2 = 1002 + 102 + 152 = 10325 = 101.612 𝑚/𝑠
GATE 2015 Sideslip 2 Mark
Q2. An aircraft is flying with inertial ground and wind speeds of 𝑣𝑔
𝑏= (100, 5, 5) 𝑚/𝑠 and 𝑣 𝑤
𝑏
= (0, −5, −10)
𝑚/𝑠, respectively, as expressed in the body frame. The corresponding sideslip angle (in degrees) is
(A) 0 (B) 5.65
(C) 8.49 (D) 9.54
β = sin-1 10
101.612
= 5.647°
i.e. sinθ =
𝑂𝑝𝑝
𝐻𝑦𝑝
Question Analysis | Book Reference | Important Concepts | Formulae | Solutions

4. 4

5. 5
FLIGHT MECHANICS - BASICS
Answer:
(D) [100.995, 5.71, 5.68]
Solution:
• [𝑢, 𝑣, 𝑤] = [100, 10, 10]
𝑉 = 𝑢2 + 𝑣2 + 𝑤2 = 1002 + 102 + 102 = 10200 = 100. 995 𝑚/𝑠
GATE 2016 Sideslip 2 Mark
Q3. The aircraft velocity (m/s) components in body axes are given as [𝑢, 𝑣, 𝑤] = [100, 10, 10]. The air velocity
(m/s), angle of attack (deg) and sideslip angle (deg) in that order are
(A) [120, 0.1, 0.1] (B) [100, 0.1, 0.1]
(C) [100.995, 0.1, 5.73] (D) [100.995, 5.71, 5.68]
β = sin-1 10
101.995
= 5.68°
β = sin-1 𝑣
𝑉
i.e. sinθ =
𝑂𝑝𝑝
𝐻𝑦𝑝
;α = tan-1 𝑤
𝑢
i.e. tanθ =
𝑂𝑝𝑝
𝐴𝑑𝑗
α = tan-1 10
100
= 5.71°
Question Analysis | Book Reference | Important Concepts | Formulae | Solutions

6. 6