Basics of Flight �

Dr M Vamshi Krishna

UNIT 2�

• Different types of flight vehicles; Components and functions of an airplane; Forces acting on Airplane: Physical properties and structure of the atmosphere; Aerodynamics - aerofoil nomenclature, aerofoil characteristics, Angle of attack, Mach number, Lift and Drag, Propulsion and airplane structures.

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• Flight basics involve four forces (lift, weight, thrust, drag) balancing for motion, while vehicles range from aerodynes (airplanes, helicopters, drones using wings/rotors for lift) and aerostats (balloons, airships using buoyancy) to spacecraft (rockets, shuttles, satellites for space) and even planetary aircraft (Mars helicopter), categorized by propulsion and operating environment, from atmospheric flight to space. 

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• Basics of Flight (The Four Forces)
• Lift: Upward force generated by wings/rotors, opposing weight.
• Weight: Downward force of gravity.
• Thrust: Forward force from engines, opposing drag.
• Drag: Backward force from air resistance, opposing thrust. 

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Types of Flight Vehicles�

• 1. Aerodynes (Heavier-than-Air)
• Airplanes (Fixed-Wing): Generate lift with wings; e.g., commercial jets, private planes, cargo planes.
• Rotorcraft (Rotary-Wing): Use rotating blades (rotors) for lift; e.g., helicopters, gyroplanes, tiltrotors (like the Osprey).
• Drones (UAVs): Unmanned aerial vehicles, often multi-rotor or fixed-wing, for various tasks.
• Gliders/Sailplanes: Unpowered, relying on air currents for flight. 
• 2. Aerostats (Lighter-than-Air)
• Balloons: Unpowered, using heated air or lighter-than-air gas (helium) for buoyancy (e.g., hot air balloons).
• Airships (Blimps/Zeppelins): Powered, steerable balloons with envelopes containing lifting gas and propellers. 

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• 3. Spacecraft & Orbital Vehicles
• Rockets/Launch Vehicles: Propel into space, acting as aircraft through atmosphere.
• Satellites: Orbit Earth or other bodies.
• Space Probes/Stations: Travel in deep space or orbit. 
• 4. Hybrid & Other
• Space Shuttles: Reusable vehicles that act as aircraft and spacecraft.
• Planetary Aircraft: Designed for other atmospheres (e.g., Mars helicopter). 

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Introduction to Flight �

• Flight is the process by which an object moves through the atmosphere or space by generating forces that counteract gravity.

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Basic Forces Acting on a Flight Vehicle �

• Every flight vehicle is governed by four fundamental forces:
• 1. Lift (L)
• Force acting upward
• Generated due to pressure difference over wings or rotor blades
• Depends on:
• Airspeed
• Air density
• Wing area
• Angle of attack

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• 2. Weight (W)
• Force due to gravity
• Acts downward through the center of gravity
• 3. Thrust (T)
• Force that propels the vehicle forward
• Generated by:
• Propellers
• Jet engines
• Rocket engines
• 4. Drag (D)
• Force that opposes motion
• Caused by air resistance
• Two types:
• Parasite drag
• Induced drag
• Condition for steady level flight:�Lift = Weight and Thrust = Drag

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Principles of Flight �

• Bernoulli’s Principle
• Faster airflow → lower pressure
• Air moves faster over curved wing surface → lift generation
• Newton’s Third Law
• Action and reaction are equal and opposite
• Wing deflects air downward → air pushes wing upward
• Angle of Attack (AoA)
• Angle between chord line of wing and relative airflow
• Increasing AoA increases lift (up to stall)
• Stall
• Occurs when AoA exceeds critical value
• Sudden loss of lift

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Classification of Flight Vehicles �

• A. Lighter-Than-Air Vehicles (Aerostats)
• Operate based on buoyancy
• Examples:
• Balloons
• Airships (Blimps)
• Characteristics:
• Lift from displaced air (Archimedes’ principle)
• Low speed
• Limited control
• Long endurance
• Applications:
• Surveillance
• Advertising
• Weather monitoring
• B. Heavier-Than-Air Vehicles (Aerodynes)
• Generate lift due to aerodynamic forces

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Types of Heavier-Than-Air Flight Vehicles�

• 1. Fixed-Wing Aircraft
• Description:
• Rigid wings
• Lift generated by forward motion
• Examples:
• Airplanes
• Gliders
• Fighter jets
• Characteristics:
• High speed
• Long range
• Requires runway
• 📌 Applications:
• Commercial transport
• Military aviation
• Cargo transport

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Rotary-Wing Aircraft�

• Description:
• Rotating blades act as wings
• Examples:
• Helicopters
• Quadcopters
• Characteristics:
• Vertical take-off and landing (VTOL)
• Hovering capability
• Lower speed than fixed-wing
• 📌 Applications:
• Rescue operations
• Surveillance
• UAV missions

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Flapping-Wing Vehicles (Ornithopters)�

• Description:
• Mimic bird/insect flight
• Lift and thrust generated by flapping motion
• Characteristics:
• High maneuverability
• Complex control
• Low payload
• 📌 Applications:
• Research
• Bio-inspired UAVs
• Surveillance

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Hybrid Vehicles�

• Description:
• Combine fixed-wing and rotary-wing features
• Examples:
• VTOL UAVs
• Tilt-rotor aircraft (e.g., V-22 Osprey)
• Advantages:
• Vertical takeoff + efficient cruise
• Flexible operations

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Space Flight Vehicles �

• Operate outside Earth’s atmosphere
• Types:
• Rockets
• Space shuttles
• Satellites
• Characteristics:
• Thrust based on Newton’s laws
• No lift or drag in vacuum
• Use rocket propulsion
• 📌 Applications:
• Communication
• Navigation (GPS)
• Earth observation

Components and Functions of an Airplane�

• An airplane consists of several major structural and functional components, each designed to ensure lift, stability, control, propulsion, and safety.

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1. Fuselage�

• Function:
• Main body of the aircraft
• Houses:
• Cockpit
• Passengers
• Cargo
• Avionics and control systems
• Characteristics:
• Streamlined shape to reduce drag
• Provides attachment points for wings, tail, and landing gear
• 📌 Types:
• Monocoque
• Semi-monocoque (most common)

2. Wings�

• Function:
• Generate lift required for flight
• How lift is produced:
• Air moves faster over the upper surface
• Pressure difference creates upward force
• Main parts of a wing:
• Leading edge
• Trailing edge
• Wing tip
• Airfoil section
• 📌 Wing-mounted control surfaces:
• Ailerons
• Flaps
• Slats

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3. Empennage (Tail Assembly)�

• Provides stability and control.
• (a) Horizontal Stabilizer
• Maintains longitudinal stability
• Prevents pitching motion
• Elevator:
• Controls pitch (nose up/down)
• (b) Vertical Stabilizer
• Maintains directional stability
• Rudder:
• Controls yaw (left/right movement)

4. Control Surfaces�

• Control SurfaceLocationFunctionAileronWingsRoll controlElevatorHorizontal tailPitch controlRudderVertical tailYaw controlFlapsWingsIncrease lift during takeoff/landingSlatsWing leading edgeDelay stall
• 📌 Together they control the three axes of flight:
• Roll
• Pitch
• Yaw

5. Power Plant (Engine)�

• Function:
• Produces thrust to overcome drag
• Types of aircraft engines:
• Piston engines (propeller aircraft)
• Turbojet
• Turbofan
• Turboprop
• 📌 Propeller function:
• Converts engine power into thrust by accelerating air backward

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6. Landing Gear�

• Function:
• Supports aircraft during:
• Takeoff
• Landing
• Ground operations
• Types:
• Tricycle landing gear (most common)
• Tail wheel landing gear
• 📌 Includes:
• Wheels
• Shock absorbers
• Braking system

7. Cockpit�

• Function:
• Control center of the aircraft
• Contains:
• Flight instruments
• Control column/yoke
• Throttle controls
• Navigation and communication systems
• 📌 Modern aircraft use glass cockpits (digital displays).

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8. Avionics�

• Function:
• Electronic systems used for:
• Navigation
• Communication
• Monitoring
• Flight control
• Examples:
• GPS
• Autopilot
• Flight management system (FMS)
• Radar

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9. Fuel System�

• Function:
• Stores and supplies fuel to the engine
• Components:
• Fuel tanks (usually in wings)
• Pumps
• Filters
• Fuel lines

10. Environmental & Safety Systems�

• Include:
• Cabin pressurization
• Air conditioning
• Fire detection systems
• Emergency exits
• Oxygen systems

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Summary Table

Control and Operation�

Flight Characteristics�

Safety and Risk�

��Applications��

Regulatory Aspects (India – DGCA)�

Advantages and Limitations�

• Airplane
• Advantages:
• Large payload
• Long range
• High speed
• Limitations:
• High cost
• Requires runway
• Risk to human life
• UAV
• Advantages:
• No pilot risk
• Low cost
• VTOL and autonomous operation
• Suitable for dangerous missions
• Limitations:
• Limited endurance
• Payload constraints
• Communication dependency

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Possible Exam Questions�

• What are the Basic Forces Acting on a Flight Vehicle ?
• Compare airplane and UAV with respect to components and operation.
• Explain in detail about Components and Functions of an Airplane ?
• Differentiate between fixed-wing UAV and multirotor UAV.
• Explain advantages of UAVs over manned aircraft.

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Forces Acting on an Airplane �

• An airplane in flight is subjected to four fundamental aerodynamic forces that govern its motion and performance.

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1. Lift (L)

Definition:

Lift is the upward force that opposes the weight of the aircraft and enables it to fly.

Source:

Generated due to pressure difference over the wing

Explained using Bernoulli’s principle and Newton’s third law

Weight (W)�

• Definition:
• Weight is the gravitational force acting downward through the aircraft’s center of gravity.
• Components:
• Structure weight
• Fuel weight
• Payload weight
• 📌 Weight is constant for a given configuration but reduces as fuel is consumed.

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Thrust (T)�

• Definition:
• Thrust is the force that propels the aircraft forward.
• Produced by:
• Propellers
• Jet engines
• Rocket engines
• 📌 Thrust must overcome drag to maintain or increase speed.

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Drag (D)

• Definition:
• Drag is the resistive force opposing aircraft motion through air.
• Types of Drag:
• (a) Parasite Drag
• Form drag
• Skin friction drag
• Interference drag
• (b) Induced Drag
• Occurs due to lift generation
• Prominent at low speeds and high angle of attack
• 📌 Drag increases with speed and aircraft surface roughness.

Force Balance in Different Flight Conditions

Physical Properties and Structure of the Atmosphere

• The atmosphere plays a critical role in flight, affecting lift, drag, engine performance, and navigation.
• 1. Composition of the Atmosphere
• GasPercentageNitrogen78%Oxygen21%Argon0.93%Carbon dioxide0.04%
• 📌 Oxygen is essential for combustion in aircraft engines.

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2. Physical Properties of the Atmosphere

• (a) Air Density (ρ)
• Mass of air per unit volume
• Decreases with altitude
• Directly affects lift and engine thrust
• 📌 UAVs and aircraft require higher speeds at higher altitudes.
• (b) Pressure
• Force exerted by air per unit area
• Decreases exponentially with altitude
• (c) Temperature
• Generally decreases with altitude (in troposphere)
• Affects air density and speed of sound
• (d) Humidity
• Amount of water vapor in air
• High humidity → lower air density → reduced lift

3. Standard Atmosphere (ISA)�

• Defined reference atmospheric conditions
• Used for aircraft performance calculations
• At sea level:
• Temperature = 15°C
• Pressure = 101.325 kPa
• Density = 1.225 kg/m³

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4. Structure (Layers) of the Atmosphere�

1. Troposphere (0–11 km)

All weather phenomena occur

Commercial aircraft and UAVs operate here

Temperature decreases with altitude

2. Stratosphere (11–50 km)

Contains ozone layer

Temperature increases with altitude

Jet aircraft cruise near lower stratosphere

3. Mesosphere (50–85 km)

Meteors burn up

Very low temperature

4. Thermosphere (85–600 km)

High temperature

Satellites and ISS operate

5. Exosphere (Above 600 km)

Outermost layer

Transition to space

5. Importance of Atmosphere in Flight

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• Determines lift generation
• Influences drag and thrust
• Affects engine performance
• Governs UAV endurance and stability

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Comparison: Atmospheric Effect on Airplane vs UAV

Possible Exam Questions�

• Explain the four forces acting on an airplane.
• How does air density affect lift?
• Describe the structure of Earth’s atmosphere.
• Why are UAVs more sensitive to atmospheric conditions?

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Introduction to Aerofoil

• An aerofoil (airfoil) is a shaped surface designed to produce lift when air flows over it.
• 📌 Used in:
• Aircraft wings
• UAV wings
• Propeller blades
• Helicopter rotors

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Aerofoil Nomenclature�

• Basic Terms
• 1. Leading Edge
• Front edge of the aerofoil
• First point of contact with airflow
• 2. Trailing Edge
• Rear edge of the aerofoil
• Point where airflow rejoins
• 3. Chord Line
• Straight line joining leading and trailing edges
• 4. Chord Length (c)
• Distance between leading and trailing edge measured along chord line
• 5. Mean Camber Line
• Line equidistant from upper and lower surfaces
• Indicates curvature of the aerofoil

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• 6. Camber
• Maximum distance between mean camber line and chord line
• Affects lift generation
• 7. Thickness
• Maximum distance between upper and lower surfaces
• Usually expressed as % of chord
• 8. Upper Surface (Suction Surface)
• Air velocity is higher
• Pressure is lower
• 9. Lower Surface (Pressure Surface)
• Higher pressure compared to upper surface
• 10. Angle of Attack (α)
• Angle between chord line and relative wind
• 📌 Increase in α increases lift up to stall angle.
• 11. Relative Wind
• Direction of airflow opposite to aircraft motion

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3. Types of Aerofoils �

• 1. Symmetrical Aerofoil
• Upper and lower surfaces identical
• Zero camber
• 📌 Used in:
• Helicopter blades
• Aerobatic aircraft
• Control surfaces
• 2. Cambered Aerofoil
• Upper and lower surfaces not identical
• Produces lift even at zero AoA
• 📌 Used in:
• Commercial aircraft
• UAVs

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Aerofoil Characteristics�

• 4.1 Lift Coefficient (CL)
• Measures lifting efficiency
• Increases with angle of attack until stall
• 4.2 Drag Coefficient (CD)
• Represents resistance offered by aerofoil
• Increases with speed and AoA
• 4.3 Lift-to-Drag Ratio (L/D)
• Measure of aerodynamic efficiency
• Higher L/D → better range and endurance
• 📌 Gliders have very high L/D ratio.

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• 4.4 Pitching Moment Coefficient (CM)
• Tendency of aerofoil to pitch nose up or down
• Important for stability and control
• 4.5 Stall Characteristics
• Stall occurs when airflow separates from upper surface
• Caused by excessive AoA
• 📌 Effects:
• Sudden loss of lift
• Increase in drag
• 4.6 Pressure Distribution
• Lower pressure on upper surface
• Higher pressure on lower surface
• Determines lift magnitude

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Effect of Angle of Attack on Aerofoil�

Aerofoil Performance Comparison�

Typical Exam Questions�

• Explain aerofoil nomenclature with neat sketch.
• Compare symmetrical and cambered aerofoils.
• Define lift coefficient and drag coefficient.
• Explain stall with respect to aerofoil.
• Why are cambered aerofoils preferred in UAVs?

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Angle of Attack (AoA)

Angle of Attack (AoA)

• 1. Definition
• Angle of Attack (α) is defined as:
• The angle between the chord line of an aerofoil and the relative wind (direction of airflow).
• 📌 It is one of the most critical parameters governing lift, drag, and stall.

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• 2. Chord Line and Relative Wind
• Chord line: Straight line joining the leading edge and trailing edge of an aerofoil
• Relative wind: Airflow direction opposite to the aircraft’s flight path
• 📌 Angle between these two lines = Angle of Attack
• 3. Importance of Angle of Attack
• Angle of attack directly affects:
• Lift generation
• Drag force
• Aircraft stability
• Stall condition
• Takeoff and landing performance

• 4. Effect of Angle of Attack on Lift
• Lift Equation:

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• Lift increases linearly with AoA up to a limit

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• 5. Critical Angle of Attack
• Maximum AoA at which lift is maximum
• Typically 12°–18° for most aerofoils
• 📌 Beyond this angle:
• Airflow separates from upper surface
• Lift decreases sharply
• Drag increases rapidly
• This condition is called stall.

• 6. Angle of Attack vs Aircraft Attitude
• 📌 Important Concept:
• Angle of attack ≠ Pitch angle
• An aircraft can stall at any attitude if AoA exceeds critical value.
• 7. Effect of Angle of Attack on Drag
• Low AoA → Low drag
• Moderate AoA → Efficient flight
• High AoA → High induced drag
• 📌 Induced drag is maximum at high AoA.

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• 8. Angle of Attack in Different Flight Phases
• Flight PhaseAoATakeoffHighClimbModerate–HighCruiseLowLandingHighStallCritical AoA exceeded
• 9. Angle of Attack in UAVs
• UAVs often operate at low Reynolds numbers
• More sensitive to AoA changes
• Small AoA variation can cause stall
• 📌 UAV flight controllers monitor AoA using:
• IMU
• Airspeed sensors
• AoA vanes (advanced UAVs)

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• 10. Measurement of Angle of Attack
• Methods:
• Mechanical AoA vanes
• Differential pressure sensors
• Air data systems
• Synthetic AoA estimation (using IMU + GPS)
• 11. Advantages of Maintaining Optimal AoA
• Maximum lift-to-drag ratio
• Improved endurance
• Fuel/battery efficiency

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Typical Exam Questions�

• Define angle of attack with neat sketch.
• Explain the effect of AoA on lift and drag.
• Differentiate between angle of attack and pitch angle.
• What is critical angle of attack?
• Why are UAVs more sensitive to AoA?

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Mach Number

• Definition
• Mach number (M) is defined as:
• The ratio of the speed of a body (aircraft/UAV) to the speed of sound in the surrounding medium.
• M=V/a
• Where:
• V = Velocity of aircraft (m/s)
• a = Speed of sound in air (m/s)

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2. Speed of Sound

• The speed of sound depends mainly on air temperature:
• a=​ Where:
• γ = Ratio of specific heats (≈ 1.4 for air)
• R = Gas constant
• T = Absolute temperature (K)
• 📌 At sea level (15°C):
• a≈340 m/s

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Classification of Flight Regimes Based on Mach Number

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• 4. Importance of Mach Number in Aerodynamics
• Mach number determines:
• Compressibility effects
• Formation of shock waves
• Drag rise (wave drag)
• Aircraft structural design
• Engine performance
• 📌 At M > 0.3, air is considered compressible.

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5. Mach Number and Aircraft Performance

• Subsonic Flight
• Smooth airflow
• Bernoulli’s principle applicable
• Used by UAVs and commercial aircraft
• Transonic Flight
• Mixed subsonic and supersonic flow
• Shock waves cause buffeting
• Rapid increase in drag
• Supersonic Flight
• Shock waves fully developed
• Requires special wing shapes (swept, delta)
• Hypersonic Flight
• Extreme temperatures
• Requires thermal protection systems

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• 6. Mach Number and Altitude
• Speed of sound decreases with altitude
• For the same aircraft speed:
• Mach number increases at higher altitude
• 📌 Hence aircraft cruise using Mach number, not airspeed.

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Mach Number vs Airspeed

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• 8. Mach Number in UAVs
• Most UAVs operate at low Mach numbers (M < 0.3)
• Compressibility effects negligible
• Focus is on:
• Lift-to-drag ratio
• Endurance
• Stability
• 📌 High-speed military UAVs may approach transonic regime.
• 9. Mach Cone and Shock Waves
• When M > 1, aircraft travels faster than sound
• Forms a Mach cone
• Results in sonic boom

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• 10. Numerical Example
• Given: Aircraft speed = 680 m/s�Speed of sound = 340 m/s
• M=680/340=2
• 📌 Aircraft is flying in supersonic regime.

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Typical Exam Questions�

• Define Mach number.
• Classify aircraft based on Mach number.
• Why is Mach number preferred over airspeed at high altitude?
• Explain the significance of Mach number in aerodynamics.
• Why are most UAVs operated at low Mach numbers?

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Lift�

• Definition
• Lift is the aerodynamic force acting perpendicular to the direction of relative wind, which supports the aircraft or UAV against gravity.
• Causes of Lift
• Lift is generated due to:
• Pressure difference between upper and lower surfaces (Bernoulli’s principle)
• Downward deflection of air (Newton’s third law)
• Angle of attack

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• Factors Affecting Lift
• Air density
• Velocity of aircraft
• Wing area
• Angle of attack
• Aerofoil shape

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• Lift in UAVs
• UAVs operate at low Reynolds numbers
• Require high-camber aerofoils
• Lift is sensitive to small AoA changes

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Drag

• Definition
• Drag is the aerodynamic force acting opposite to the direction of motion, resisting forward movement.
• Types of Drag
• (a) Parasite Drag
• Independent of lift and increases with speed.
• Components:
• Form drag – due to shape
• Skin friction drag – due to surface roughness
• Interference drag – due to airflow interaction
• (b) Induced Drag
• Caused due to lift generation
• Prominent at low speeds and high angle of attack
• Result of wing tip vortices

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Variation of Lift and Drag with Speed

• Lift and Drag Polar
• Graph of CLC_LCL​ vs CDC_DCD​
• Shows aerodynamic efficiency
• Used to determine:
• Stall point
• Best endurance speed
• Best range speed

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• Stall and Its Effect on Lift & Drag
• Occurs when critical AoA is exceeded
• Lift decreases sharply
• Drag increases rapidly
• 📌 Stall can occur at any speed if AoA exceeds critical value.

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Lift and Drag Comparison (Airplane vs UAV)

Typical Exam Questions�

• Define lift and drag.
• Derive lift and drag equations.
• Explain different types of drag.
• What is L/D ratio and its significance?
• Why is induced drag high at low speeds?

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Introduction to Aircraft Propulsion�

• Propulsion is the method of producing thrust to move an aircraft forward by accelerating a mass of air or gases backward.
• 📌 Based on Newton’s Third Law of Motion.
• 1. Introduction to Aircraft Propulsion
• Propulsion is the method of producing thrust to move an aircraft forward by accelerating a mass of air or gases backward.
• 📌 Based on Newton’s Third Law of Motion.

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• 2. Types of Aircraft Propulsion Systems
• 2.1 Propeller Propulsion
• Working:
• Propeller blades act as rotating aerofoils
• Accelerate air backward to produce thrust
• Engine types:
• Piston engines
• Turb Reid
• Applications:
• Light aircraft
• Training aircraft
• UAVs
• Advantages:
• High efficiency at low speeds
• Lower cost
• Short takeoff
• Limitations:
• Limited speed range
• Noisy

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2.2 Jet Propulsion

• Types of Jet Engines:
• (a) Turbojet
• Air → compression → combustion → exhaust
• High speed, low efficiency at subsonic speeds
• (b) Turbofan
• Large bypass ratio
• Used in commercial aircraft
• (c) Turboprop
• Jet engine driving a propeller
• Combines jet and propeller advantages
• (d) Ramjet & Scramjet
• No moving parts
• Used at supersonic/hypersonic speeds

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2.3 Rocket Propulsion

• Carries its own oxidizer
• Operates outside atmosphere
• 📌 Used in:
• Spacecraft
• Missiles

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Comparison of Propulsion Systems

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Airplane Structures �

4. Introduction to Aircraft Structures

• Aircraft structure must:
• Withstand aerodynamic forces
• Be lightweight
• Ensure safety and durability

5. Major Structural Components of an Airplane

• 5.1 Fuselage
• Function:
• Main body of aircraft
• Houses cockpit, passengers, cargo
• Types:
• Truss
• Monocoque
• Semi-monocoque (most common)

5.2 Wings

• Function:
• Generate lift
• Structural elements:
• Spars
• Ribs
• Stringers
• Skin
• 📌 Wings also store fuel.

5.3 Empennage (Tail Section)

• Horizontal Stabilizer
• Provides longitudinal stability
• Vertical Stabilizer
• Provides directional stability

5.4 Control Surfaces�

• Ailerons
• Elevator
• Rudder
• Flaps
• Slats

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5.5 Landing Gear�

• Function:
• Supports aircraft during takeoff & landing
• Types:
• Tricycle
• Tail wheel

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Aircraft Structural Materials

7. Load Types Acting on Aircraft Structures

• Aerodynamic loads
• Inertial loads
• Ground loads
• Thermal loads

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8. Structural Design Requirements�

• Strength
• Stiffness
• Fatigue resistance
• Damage tolerance
• Weight optimization

Airplane Structures vs UAV Structures

Typical Exam Questions�

• Explain different types of aircraft propulsion systems.
• Describe the structural components of an airplane.
• Compare propeller and jet propulsion.
• Explain fuselage construction methods.
• Why are composite materials preferred in UAVs?

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