FLIGHT DYNAMICS [AE _]
Course objectives:
The course introduces students to the performance, stability, and control of a wide range of airborne vehicles.
Attention is given to mathematical models and techniques for analysis, simulation, and evaluation of flying qualities,
with brief discussion of guidance, navigation, and control issues. Topics include equations of motion, configuration
aerodynamics, analysis of linear systems, and longitudinal/lateral/directional motions.
 Introduction (6 hours)
 Introduction, Mathematical Preliminaries
 Introduction to Flight Dynamics
 Flight of a Paper Airplane
 Math Preliminaries
 PointMass Dynamics and Aerodynamic Forces
 The Atmosphere
 Equation of motion for a particle (Point Mass)
 Introduction to lift and drag
 Equations of motion with Aerodynamics and Thrust
 Introduction to Aerodynamic Propulsion
 Configuration Aerodynamics (10 hours)
 LowSpeed Aerodynamics
 2D Aerodynamic Lift and Drag
 Effect of sweep angle on lift
 Thin Aerofoil theory
 Description of Aircraft configuration
 3D Aerodynamic Lift and Drag
 Wing twist effects
 Aerodynamic Strip Theory
 Effect of aspect ratio on 3D wing lift slope coefficient
 Longitudinal Control Surfaces
 Induced Drag and HighSpeed Aerodynamics
 Induced Drag
 Mach Number Effects
 Newtonian flow and HighAngleofAttack Lift and Drag
 Aerodynamic Moments
 Spanwise Lift Distribution of 3D Wings
 Secondary wing Structures
 Wingtip Design
 Sweep Effect on Thickness Ratio
 Moments of the airplane
 Airplane Balance
 Pitching Moment of the Airplane
 LateralDirectional Effects of Sideslip Angle
 Tail Design Effects
 Propeller Effects
 Flight Performance (8 hours)
 Cruising Flight Performance
 Flight in Vertical Plane
 Steady, Level Flight
 The Flight Envelop
 Optimal Crusing Flight
 Gliding, Climbing, and Turning Flight Performance
 Gliding Flight
 Climbing Flight
 Optimal Climbing Flight
 The Maneuvering Envelope
 Turning Flight
 Equations of Motion (12 hours)
 Aircraft Equations of Motion  Translation and Rotation
 Translational Position
 Rotational Orientation
 Angular Momentum
 The Inertia Matrix
 Rate of Change of Angular Momentum
 Aircraft Equations of Motion  Flight Path Computation
 Euler Angle Rates
 RigidBody Equation of Motion
 FLIGHTComputer Program to Solve the 6DOF Equation of Motion
 Examples from FLIGHT
 Aerodynamic Damping
 Aircraft Control Devices and Systems
 Control Surface Types
 Control Surface Aerodynamics
 Control Mechanization Effects
 Yaw Damping
 Flight Control Systems
 Linearized Motion in Flight (12 hours)
 Linearized Equations of Motion
 Linear, TimeVarying(LTV) Approximation of Perturbation Dynamics
 Separation of Equation of Motion into Longitudinal and Lateral Directional Sets
 Decoupling Approximation for Small Perturbations from Steady, Level Flight
 Linearized Longitudinal Equations of Motion
 FourthOrder Hybrid Equations of Motion
 Dimensional Stability and Control Derivatives
 Comparison of 2nd and 4th order Model Response
 Linearized LateralDirectional Equations of Motion
 Linearized LateralDirectional Equation of Motion in Steady, Level Flight
 Stability Axis Representation of Dynamics
 2nd Order Approximate Modes of LateralDirectional Motion
 Comparison of 4th and 2nd Order Dynamic Models
 Methods of Analysis and Design (12 hours)
 Maneuvering at High Angles and Angular Rates
 Coupling of Longitudinal and LateralDirectional Motions
 Tumbling and Spins
 Control at Height Aerodynamic Angles
 Aeroelasticity and Fuel Slosh
 OneDimensional Mode of Aeroelasticity
 Fuel Shift and Slosh
 Problems of High Speed and Altitude
 Effects of Air Compressibility on Flight Stability
 Altitude/Airspeed Instability
 VariableSweep/Incidence Wings (“Morphing”)
 Future of HighSpeed Flight
 Flight and Wind Tunnel Testing
 Wind Tunnel Force and Moment Data
 Compressibility Effects on Impact Pressure
 Air Data Computation for Supersoinc Aircraft
 Atmospheric Hazards to Flight
Practical:
 This course is the aircraft performance, stability, and control course which most directly prepares the student for the aircraft capstone design course. Topics covered in the first part of the course help the student identify the parameters which affect takeoff, climb, cruise, descent, turn, and landing performance as well as specific excess power. Topics covered in the second part of the course include a detailed look at static longitudinal stability, with special emphasis on cg location for static stability, and an overview of dynamic longitudinal stability and response to an elevator deflection and to a vertical gust .
 MATLAB : Most of the computer exercises have been placed in the lab associated with the class. Some assignments require computation and plotting.
References:
 Stengel, R., Flight Dynamics, Princeton University Press, 2004.
 Etkin, B., “Dynamics of Flight Stability and Control”, Edn. 2, John Wiley, New York, 1982.
 Babister, A.W., “Aircraft Dynamic Stability and Response”, Pergamon Press, Oxford, 1980.
 Dommasch, D.O., Shelby, S.S., and Connolly, T.F., “Aeroplane Aero dynamics”, Third Edition, Issac Pitman, London, 1981
Evaluation Scheme:
There will be questions covering all the chapters in the syllabus. The evaluation scheme for the question will be as indicated in the table below:
Chapter 
Hours 
Mark distribution* 
1 
6 
8 
2 
10 
16 
3 
8 
16 
4 
12 
16 
5 & 6 
12 & 12 
24 
Total 
60 
80 
*Note: There may be minor deviation in mark distribution.
