V.1.07
Presented by
FAA Academy
Air Traffic Division
Federal Aviation
AdministrationAir Traffic Basics
50043/50143
Principles of Flight
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Principles of Flight / V.1.07
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Principles of Flight
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Principles of Flight / V.1.07
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On an End-of-Lesson Test you will identify:
1. Primary and secondary sources of lift.
2. Relative wind.
3. Types and parts of airfoils.
4. Four forces that affect aircraft in flight, their interrelationships,
and the effects on aircraft performance.
5. Effects of altitude, temperature, and pressure on aircraft
performance.
6. Functions of primary and secondary flight controls and the
movement around the aircraft axes.
7. Helicopter aerodynamics.
8. Helicopter controls.
9. Hazards affecting flight.
Objectives
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Principles of Flight / V.1.07
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Bernoulli’s Principle
Area of increased speed
and decreased pressure
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Bernoulli’s Principle (Cont’d)
Area of increased speed
and decreased pressure
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Bernoulli’s Principle (Cont’d)
Pressure Differential
Force
Pressure Differential
Force
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Newton’s Third Law of Motion
“For every action, there is an equal and opposite reaction.”
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Response Item
• The primary source of lift on an airfoil is
created by a differential in ________.
A. temperature
B. pressure
C. reaction
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Response Item
• The statement, “the internal pressure of a
fluid decreases at points where the speed
of the fluid increases” is a part of
________.
A. Bernoulli’s Principle
B. Newton’s Law of Motion
C. Hindenberg’s Theory
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Relative Wind
FLIGHT PATH
RELATIVE WIND
LEVEL FLIGHT
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Types of Airfoils
Wing
Propeller
Helicopter rotorHorizontal
stabilizer
Horizontal
stabilizer
Vertical tail
surface
Fuselage
Vertical tail
surface
Fuselage
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Parts of an Airfoil
CHORD LINE
TRAILING EDGELEADING EDGE
TRAILING EDGELEADING EDGE
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Angle of Attack
FLIGHT PATH
20°
5°
10°
The angle of attack is based on the Relative Wind, not the ground.
RELATIVE WIND
RELATIVE WIND
FLIGHT PATH
RELATIVE WIND
FLIGHT PATH
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Camber
EQUAL CURVATURE (SYMMETRICAL)
TOP CONVEX BOTTOM FLAT
TOP CONVEX BOTTOM CONCAVE
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Propeller-Pitch Angle
TAKEOFF CLIMB CRUISE
Small
pitch
angle
Medium
pitch
angle
Large
pitch
angle
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Wing Planforms
Tapered leading edge
and trailing edge
Straight leading
and trailing edges
Delta wing
Straight leading edge,
tapered trailing edge
Tapered leading edge,
straight trailing edge
Sweptback
wings
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Forces Acting on an Airplane in Flight
LIFT
WEIGHT
DRAG
THRUST
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Response Item
• What are the three principle airfoils?
– ANSWER: Wings, horizontal tail surface, propeller
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Response Item
• What is the curvature of the airfoil from the
leading edge to the trailing edge?
– ANSWER: camber
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Four Atmospheric Properties
Water Vapor Altitude
Temperature Pressure
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Atmosphere and Temperature
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Altitude and Pressure
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Effect of Altitude on Takeoff
Sea Level
Elevation
5,000 Feet
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Effect of Temperature on Takeoff
Cold Winter Day
Hot Summer Day
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Effect of Humidity on Takeoff
Dry Air
Moist Air
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Combined Effects on Takeoff
Cold, Dry Day at
Sea Level
Hot, Humid Day at
5,000 Feet Elevation
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Axes
LONGITUDINAL
AXIS
(ROLL)
LATERAL AXIS
(PITCH)
VERTICAL AXIS
(YAW)
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Primary Control Surfaces
Rudder
Elevator
Aileron
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Ailerons
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Movement of Ailerons
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Yoke Position When Wings are level
or Banking
LEVEL FLIGHT
CONSTANT BANK TURN
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Elevator
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Movement of Yoke
YOKE PULLED BACK
AIRCRAFT CLIMBS
YOKE PUSHED FORWARD
AIRCRAFT DESCENDS
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Rudder
RUDDER
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Rudder Movement
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Rudder Pedals
RUDDER
PEDALS
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Response Item
• Which two movements are controlled by the
control yoke?
– ANSWER: Roll and pitch
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Question
What are the names of the following primary
control surfaces?
1
2
3
Aileron
Elevator
Rudder
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Trim Tabs
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Elevators and Trim Tabs
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Trim Tab Control
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Flaps
FLAPS
AILERONS
AILERONS
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Cockpit Flap Handle
COCKPIT
FLAP
HANDLE
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Response Item
• Which of the following is a primary control
surface?
A. Variable-pitch propeller
B. Flap
C. Rudder
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Response Item
• The extension of flaps cause an increase
in ________.
A. stall speed
B. airspeed
C. drag
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Collective
COLLECTIVE MOVEMENT
PRODUCES CHANGES IN
BLADES PITCH ANGLE
PRODUCING LIFT
INCREASED BLADE ANGLE
CREATES GREATER LIFT
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Relationship of Lift and Weight in a
Hover
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Cyclic
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Forward Flight
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Rearward Flight
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Sideward Flight
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Autorotation
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Attached Airstream
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Mainstream Separation Begins
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Separation Moves Forward
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Wing Stalls
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Wind Tunnel
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Types of Icing
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Pitot Tube Icing
PITOT TUBE
ICE
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Carburetor Icing
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A Lesson in Flight
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The End

Principles of flight