CIVIL AIR PATROL United States Air Force Auxiliary Maxwell Air Force Base, Alabama

CIVIL AIR PATROLUnited States Air Force AuxiliaryMaxwell Air Force Base, Alabama

Disclaimer:This presentation is for the exclusive use of the Civil

Air Patrol and is not to be used for sale or profit.

INTRODUCTION INTRODUCTION TO FLIGHTTO FLIGHT

Aerospace DimensionsAerospace Dimensions

MODULE 1MODULE 1

By Patrick B. Smith, Washington Wing, CAPBy Patrick B. Smith, Washington Wing, CAP

Chapter 1 - Introduction to FlightChapter 1 - Introduction to Flight

Upon completion of this chapter, the cadet should know:

• The relationship between Bernoulli’s Principle and Newton’s three laws of motion and how they were used to develop a machine that could fly.

• The coefficient of lift and the parameters involved.

• The parts of an airplane and airfoil.

• The four forces affecting an airplane in flight

• The three axis, movement around those axis and the control surfaces that create that motion.

Important Terms - Learning the Language of AirplanesImportant Terms - Learning the Language of Airplanes

• aero - pertaining to air• aerodynamics - relating to the forces of air in motion• aeronautics - the science of flight within the atmosphere• aerospace - a combination of aeronautics and space • AGL - above ground level• air - a mixture of gases that contain approximately 79% nitrogen, 19%

oxygen and 2% other gases• aircraft - any machine that is capable of flying through the air.

Ultralights, airplanes, gliders, balloons, helicopters are all included• airplane - an aircraft that is kept aloft by the aerodynamic forces upon

its wings and is thrust forward by a propeller, or other means of propulsion, such as a jet or rocket

• airfoil - component, such as a wing, that is specifically designed to produce lift, thrust or directional stability

• airport - a place on either land or water where aircraft can land and take off for flight

• altitude - height expressed in units above sea level, or ground level• aviation - the science and technology of flight within the atmosphere• aviator - a person who operates an aircraft during flight• camber - the curved part of an airfoil from its leading to its trailing edge• drag - a force which retards the forward movement of an aircraft in flight• dynamic - forces in motion

Important Terms - Learning the Language of AirplanesImportant Terms - Learning the Language of Airplanes

• leading edge - the front part of an airfoil• lift - the upward force, which opposes gravity, that supports the

weight of an aircraft• relative wind - the flow of air which moves opposite the flight

path of an airplane• static - standing still, or without motion• supersonic - faster than the speed of sound. Subsonic is below

the speed of sound• thrust - the force which moves an aircraft forward in flight• trailing edge - the back part of an airfoil• wind - air in motion

Important Terms - Learning the Language of AirplanesImportant Terms - Learning the Language of Airplanes

The Human Quest to FlyThe Human Quest to FlyMyths and Legends• 3500 BC - Earliest illustration of

flight found in ancient Babylonia• 800 BC - 527 AD: The Greek

god Hermes and the Roman god Mercury traveled on winged sandals

• Daedalus and Icarus

The Human Quest to FlyThe Human Quest to Fly

• 100 BC - Chinese invent the kite

• 1100 AD - They begin using gun powder

• Legend of Wan Hoo who attempted to fly to the Moon riding a large chair with 47 large rockets attached

• 4,000 years ago, the Emperor Shun escaped prison by “donning the work clothes of a bird”

Early Scientific ResearchEarly Scientific Research

• Leonardo da Vinci (1452 - 1519) left the world 160 pages of sketches and drawings of flying machines, including the world’s first know designs of the parachute and helicopter. He also wrote about the importance of the center of gravity, center of pressure and streamlining.

FLYING MACHINE - 1505

Self Portrait - 1513

Early Scientific ResearchEarly Scientific Research

• Three European scientists, Torricelli from Italy; Von Guericke from Germany; Pascal from France, performed scientific research of the atmosphere. The invention of the barometer and the air pump in the period beginning in the late 1500’s through the 1700’s led to knowledge essential for later attempts at manned flight.

Evangelista Torricelli (1608 - 1647)

Otto Von Guericke (1602 - 1686)

Barometer - 1644

Air Pump - 1654

Early Scientific ResearchEarly Scientific Research

• A Jesuit priest, Laurenco de Gusmao, is credited with inventing the hot-air balloon. In 1709 he demonstrated a small balloon for the King of Portugal.

Henry Cavendish (1731 - 1810)

In 1766, the English chemist Henry Cavendish discovered a gas which he called “flammable air” later named hydrogen

The First to FlyThe First to Fly

• Joseph and Etienne Montgolfier were the first to achieve manned flight.

• In June 5, 1783 the Montgolfier Brothers make the first public demonstration of their discovery by building a fire under a 38’ diam. linen and paper bag.

• On September 9, 1783 they demonstrated their balloon before King Louis XVI. The first passengers were a sheep, rooster and duck.

• The first man to fly in a lighter-than-air craft were Pilatre de Rozier and the Marquis d’ Arlandes on November 21, 1783. The flight lasted 25 minutes and covered a little more than 5 miles.

Marquis d’ Arlandes

The greatest Contributor to the The greatest Contributor to the Science of Flight?Science of Flight?

The wing tip of a bird trace a figure eight as they move through the air. The downward beat moves the bird forward as the outer tips move against the air. Like an airplane’s

wing, there is a pressure difference between the upper and lower areas of a bird’s wing. This creates “induced” or “Bernouliian lift.”

Daniel Bernoulli (1700 - Daniel Bernoulli (1700 - 1782)1782)

His discovery of the relationship between pressure and fluids in motion became the cornerstone of the theory of airfoil lift. He found that fluid, like air in motion, has a constant pressure. When that fluid is accelerated, the pressure drops.

Bernoulli’s Theory IllustratedBernoulli’s Theory Illustrated

Bernoulli’s Theory DemonstratedBernoulli’s Theory Demonstrated• Bernoulli's principle demonstration. (a) A person holds two curved sheets of paper The

pressure between the sheets in (b) is lower than the surrounding pressure causing the sheets to get closer. (c) The same result is obtained by using a single sheet. The pressure above the sheet in (d) is lower than the pressure below, thus causing the sheet to lift.

•

Bernoulli’s Theory IllustratedBernoulli’s Theory Illustrated

Sir Isaac Newton (1643 - Sir Isaac Newton (1643 - 1727)1727)

• 1. An object at rest will remain at rest unless acted upon by some outside force.

• 2. A force acting upon a body causes it to accelerate in the direction of the force. Acceleration is directly proportional to the force and inversely proportional to the mass of the body being accelerated..

• 3. For every action, there is an equal and opposite reaction.

All three of Newton’s Laws of Motion are at work on this F-117 Stealth Fighter

Lift = CL x R x 1/2 V2 x A

CL - coefficient of lift. Takes into consideration the angle of attack and airfoil design

R - Density of the air. Lift and air density are directly proportional.

1/2 V2 - relates to velocity of air over and under the wing. Lift is proportional to the velocity squared

A - wing area. Determined by chord multiplied by wing span. Area and lift are directly proportional

Exceeding the “critical angle of attack”Exceeding the “critical angle of attack”

THE FOUR FORCES ACTING UPON AN AIRRPLANE THE FOUR FORCES ACTING UPON AN AIRRPLANE IN FLIGHTIN FLIGHT

Each of these forces are known as opposing forces, that is, they work against each other. Drag and gravity are two natural opposing forces, while thrust and lift are both

artificial forces.

CREATING EVEN MORE LIFTCREATING EVEN MORE LIFT

Aeronautical engineers have worked since the airplane was first developed to create more lift. They

have found four ways in which to accomplish this. Can you name them?

CREATING EVEN MORE LIFTCREATING EVEN MORE LIFT

• 1. First a wing will lift more weight if it is larger.

• 2. A wing will lift more weight if the upper curvature, the upper camber, of the wing is greater.

• 3. By increasing the speed of the aircraft

• 4. Increasing the angle of attack

THE THREE AXISTHE THREE AXIS

Chapter 2 - To fly by the Lifting Chapter 2 - To fly by the Lifting Power of Rising AirPower of Rising Air

Upon completion of this chapter, the cadet should know:

• How gliders use the environment to obtain altitude

• Why gliders look differently that powered airplanes

• How gliders can achieve great distances without power

Important Terms - The Language of Sailplanes & GlidersImportant Terms - The Language of Sailplanes & Gliders

• altitude - the height, or distance, above a reference plane. • aspect ratio - The ratio between the span of the wing and the chord

length• convection - fluid motion between regions of unequal heating• glide ratio - a mathematical relationship between the distance an

aircraft will glide forward to the altitude lost• lapse rate - the average rate at which temperature decreases with an

increase in altitude• lift-to-drag ratio - this ratio is used to measure the gliding efficiency of

an aircraft• soaring - the art of staying aloft by exploiting the energy of the

atmosphere

Important Terms - The Language of Sailplanes & GlidersImportant Terms - The Language of Sailplanes & Gliders

• span - the distance from wingtip to wingtip• spoilers - devices located on the wings that disrupt the airflow over the

wings. This disruption cause a loss of lift• stability - the atmosphere’s resistance to vertical motion• thermal - a column of air that moves upward• tow plane - usually a single-engine aircraft that will pull a glider from

the ground to an altitude w here it can be released• wave - as air moves across mountain ranges, it sometimes starts a

waving action with strong up and down motions. Sailplane pilots can use this motion to gain altitude

RISING AIR CAN MAKE THINGS FLY

HIGHER AND FASTER

What design features make gliders better able to ride this rising air?

Chapter 3 - Balloons, They Create Chapter 3 - Balloons, They Create Their Own ThermalsTheir Own Thermals

Upon completion of this chapter, the cadet should know:

• The principle of buoyancy and how this relates to the flight of a balloon

• The components of a balloon and how each works in the flight profile

• The history of the balloon and why it’s recognized as the first powered manned flight

Important Terms - Balloon LanguageImportant Terms - Balloon Language

• balloon - an aircraft that uses lighter-than-air gas for its lift • burner - the heat source for filling the envelope with hot air• buoyancy- to rise or float on the surface of water or within the atmosphere• crown - the top of the hot air balloon’s envelope• envelope - the main body of the balloon usually made of nylon• gore - one of several vertical panels that make up the envelope• Montgolfier - the name of the two French brothers who created the first

successful, manned, hot air balloon in 1783• parachute panel - located in the tip of the balloon’s envelope that allows it

to be deflated. • Propane - a lightweight, low carbon fuel used in hot air balloon burners• thermistor - an instrument which measures the temperature within the

envelope• wicker - a form of wooden construction used in t he baskets (gondola)

Some important terminology

The Mathematics of The Mathematics of a Balloon’s Lifting a Balloon’s Lifting PowerPower

This is not the end but the beginning.

Are there any questions?