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Fundamentals of Flight A Basic Introduction to Aerodynamics

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The Four Forces of Flight The four forces act on the airplane in flight and also work against each other.

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The Four Forces of Flight The four forces act on the airplane in flight and also work against each other.

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Weight counteracts lift. The earths gravity pulls down on objects and gives them weight.

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Whats it take to create lift? Air and motion. How do we explain lift? Newtons Laws of Motion and Bernoullis Principal are used to explain lift.

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Newtons Second Law: force causes a change in velocity which in turn generates another force. Newtons Third Law: net flow of air is turned down resulting in an equal and opposite upward force.

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Newtons Third Law states that for every action there is an equal and opposite reaction.

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Venturi Tube Bernoulis first practical use of his theorem Where are venturi tubes used today?

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Hold two sheets of paper together, as shown here, and blow between them. No matter how hard you blow, you cannot push them more than a little bit apart!

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Bernoullis Theory in Action Air speeds up in the constricted space between the car & truck creating a low-pressure area. Higher pressure on the other outside pushes them together.

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What is a wing? A wing is really just half a venturi tube.

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A fluid (and air acts like a fluid) speeds up as it moves through a constricted space Bernoullis Principle states that, as air speeds up, its pressure goes down.

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Bernoulli's Principle: slower moving air below the wing creates greater pressure and pushes up.

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Bernoullis Principle: Air moving over the wing moves faster than the air below. Faster-moving air above exerts less pressure on the wing than the slower-moving air below. The result is an upward push on the wing--lift!

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Bernoullis Principal: pressure variation around the wing results in a net aerodynamic pushing up.

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http://www.grc/nasa.gov/WWW/Wright /airplane/shape.html http://www.grc/nasa.gov/WWW/Wright /airplane/shape.html

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A wing creates lift due to a combination of Bernoullis Principal & Newtons Third Law

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Interactive Wright 1901 Wind Tunnel Interactive Wright 1901 Wind Tunnel Interactive Wright 1901 Wind Tunnel

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Internal ribs define the wings shape Wing Shape

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This US Navy Carrier Jet has a very small wing, how can it fly? Can you see the airfoil? Why is the wing small? What other aerodynamic devices can you see?

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How can an airplane fly upside down?

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http://www.grc.nasa.gov/WWW/Wright/ airplane/incline.html http://www.grc.nasa.gov/WWW/Wright/ airplane/incline.html

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Pitch Around the Lateral Axis

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The ELEVATOR controls PITCH. On the horizontal tail surface, the elevator tilts up or down, decreasing or increasing lift on the tail. This tilts the nose of the airplane up and down. Elevator Controls Pitch

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Roll Around Longitudinal Axis

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Ailerons Control Roll The AILERONS control ROLL. On the outer rear edge of each wing, the two ailerons move in opposite directions, up and down, decreasing lift on one wing while increasing it on the other. This causes the airplane to roll to the left or right.

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Yaw Around the vertical Axis

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The RUDDER controls YAW. On the vertical tail fin, the rudder swivels from side to side, pushing the tail in a left or right direction. A pilot usually uses the rudder along with the ailerons to turn the airplane. Rudder Controls Yaw

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Vectors: Two Kinds in Aviation Vectors to final approach instructions to a pilot to steer a specific course Turn left heading 270, vectors to final approach course Grand Junction. A physics term to define magnitude and direction.

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Vectors A physics term to define magnitude and direction. Direction: 045 Magnitude: 20 20 45 o What?

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Vectors 20 What Units? Some unit of distance, force, acceleration, time, etc.

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Vectors

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What good are they? Or, I was told there would be No Math ! They help us find out what happens! Adding Vectors together = Resultant

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Vectors Therefore, any vector can be analyzed or broken down into horizontal and vertical components Lift

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Vectors: The MATH Pythagorean Properties of right triangles

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Which of these airplanes will speed up? Which will slow down?

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Drag is the force of resistance an aircraft feels as it moves through the air.

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For an airplane to speed up while flying, thrust must be greater than drag. For an airplane to take off, lift must be greater than weight.

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Engines (either jet or propeller) typically provide the thrust for aircraft. When you fly a paper airplane, you generate the thrust.

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A propeller is a spinning wing that generates lift forward.

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What will happen when the fire-fighting plane drops its load of water?

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AIRPLANE PARTS

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Airplane Parts