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![Angle of Attack (AOA)
Definition
The angle between the relative wind (V∞) and the chord line (the line
connecting Leading edge [LE] & Trailing edge [TE]) is the angle of attack a
of an airfoil.
JDougMcLeanatEnglishWikipedia/CCBY-SA
(https://creativecommons.org/licenses/by-sa/3.0)
• The Angle of Attack is abbreviated as (AOA).
• It is symbolized as “α”.
• In some literature, alternate reference line is considered instead of chord line.](https://image.slidesharecdn.com/11fm-anglefoattack-200822030155/75/Angle-of-attack-Flight-Mechanics-GATE-Aerospace-4-2048.jpg)
Uploaded byAge of Aerospace
Angle of attack | Flight Mechanics | GATE Aerospace
This document provides an overview of flight mechanics topics including angle of attack. It discusses the angle of attack (AOA) as the angle between the relative wind and chord line of an airfoil. Greater AOA results in greater lift but also greater drag. Higher AOA variation can cause stall from loss of lift. It recommends visualizing AOA effects using NASA's FoilSim tool. The document also outlines core topics like aircraft configurations, flight instruments, aerodynamic forces, airplane performance, stability, and dynamic stability to be covered.
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Angle of attack | Flight Mechanics | GATE Aerospace
- 1. FLIGHT MECHANICS Presented by- Ganesh Natarajan S Target Audience: Gate Aerospace, Aeronautical and Aerospace Engineering Students, etc. Angle of Attack (AOA) α V∞
- 2. CORE TOPICS Basics: Atmosphere:Properties, standard atmosphere. Classification of aircraft. Airplane (fixed wing aircraft) configuration and various parts. Pressure altitude; equivalent, calibrated, indicated air speeds; Primary flight instruments: Altimeter, ASI, VSI, Turn-bank indicator. Angle of attack, sideslip; Roll, pitch & yaw controls. Aerodynamic forces and moments. Airplane performance: Drag polar; takeoff and landing; steady climb & descent; absolute and service ceiling; range and endurance, load factor, turning flight, V-n diagram. Winds: head, tail & cross winds. Static stability: Stability & control derivatives; longitudinal stick fixed & free stability; horizontal tail position and size; directional stability, vertical tail position and size; lateral stability. Wing dihedral, sweep & position; hinge moments, stick forces. SPECIAL TOPICS Dynamic stability: Euler angles; Equations of motion; Decoupling of longitudinal and lateral- directional dynamics; longitudinal modes; lateral-directional modes. SYLLABUS
- 3. Outline Let’s Start Angle ofAttack (AOA) Previous Lessons Primary flight instruments Definition • Angle of Attack (AOA) • Insights FoilSim AOA effect Visualization • Symmetric Airfoil • Cambered Airfoil • Flat Plate Special Question • Why Airfoil? • Why not flat plate?
- 4. Angle of Attack(AOA) Definition The angle between the relative wind (V∞) and the chord line (the line connecting Leading edge [LE] & Trailing edge [TE]) is the angle of attack a of an airfoil. JDougMcLeanatEnglishWikipedia/CCBY-SA (https://creativecommons.org/licenses/by-sa/3.0) • The Angle of Attack is abbreviated as (AOA). • It is symbolized as “α”. • In some literature, alternate reference line is considered instead of chord line.
- 5. Angle of Attack(AOA) MotionImageryStandardsBoard(MISB)/Publicdomain
- 6. Insights: Angle ofAttack • Unit Conversion: 1Deg × 𝜋 180 = 0.01745Rad • Greater Angle of Attack = Greater Lift* = Greater Drag • Higher Angle of Attack variation results in stall (Loss of lift)! • Zero-lift angle of attack (αL=0) varies based on the type of airfoil. Lets Visualize the effect of Angle of Attack! Through NASA’s FoilSim. FoilSim Student JS: https://www.grc.nasa.gov/www/k-12/airplane/foil3.html
- 7. Book Reference • Introductionto Flight, J.D. Anderson (7th Edition): Pg.No: (292,301-302,587). Angle of Attack (AOA)
- 8. Summary Angle of Attack FoilSim Copyright Notice:Images used in this presentation are sourced from pixabay.com under “Pixabay License” which are “Free for commercial use and No attribution required” category (or) from other sources, in which case appropriate attributions are provided.