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Federal Aviation Administration. BASIC AERODYNAMICS PART I. PRESENTED BY: Dennis H. Whitley FAASTeam Lead Representative NORTH FLORIDA REGION. MY MOTTO.
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Federal Aviation Administration BASIC AERODYNAMICS PART I PRESENTED BY: Dennis H. Whitley FAASTeam Lead Representative NORTH FLORIDA REGION
MY MOTTO SHOW ME A PILOT THAT CAN’T ANSWER A CORRELATIVE QUESTION AND/OR CAN’T PERFORM A GIVEN TASK, & I’LL SHOW YOU A PILOT THAT DOESN’T UNDERSTAND WHAT HE/SHE IS TRYING TO ACCOMPLISH.
FLIGHT INSTRUCTING MUST NOT BE THE BY-PRODUCT OF BUILDING FLIGHT HOURS.
BUILDING FLIGHT HOURS MUST BE THE BY-PRODUCT OF FLIGHT INSTRUCTING.
SAFETY COMMITMENT VS DEDICATION
THIS DISCUSSION IS BASED ON SUBSONIC AIRCRAFT AND WILL BE “VERY BASIC” “NO FORMULAS” “VERY LITTLE MATH”
WE WILL TALK ABOUT ATMOSPHERIC PRESSURE 4 FORCES LIFT/WEIGHT/THRUST/DRAG GROUND EFFECT TURNING TENDENCIES TRIM DEVICES AERODYNAMICS OF SPINS SLIPS/SKIDS ADVERSE YAW
ATMOSPHERIC PRESSURE IS THE WEIGHT OF ALL THE AIR UPON THE SURFACE OF THE EARTH.
WHAT DOES 30 hg MEANS? HOW WAS ATMOSPHERIC PRESSURE MEASURED?
36 YARD STICK 36 INCHES TALL
36 YARD STICK
36 YARD STICK
WHAT IS AN ALTIMETER? A PRESSURE DIFFERENTIAL GAUGE
20 20 20 25 25 25 15 15 15 30 30 30 10 10 10 35 35 35 5 5 5 40 40 40 0 0 0 HG HG HG FROM SOURCE FROM SOURCE
Kollsman Window Static Port
SEA LEVEL static port pressure 31.00 hg. sea level pressure 31.00 hg. 31.00
static port pressure 23.00 hg. sea level pressure 31.00 hg. 31.00
WHAT IS ALTIMETER SETTING? SEA LEVEL PRESSURE CORRECTED FOR NONSTANDARD TEMPERATURE.
WHAT IS THE MAIN REASON THAT AN AIRPLANE IS ABLE TO FLY? BECAUSE OF THE WEIGHT OF THE AIR. In other words the aerodynamic effect air has on the aircraft.
DEFINITION OF AERODYNAMICS The branch of science that deals with the forces produced by air flowing over specially shaped surfaces called airfoils.
IS THERE ANY THING WRONG WITH THIS PICTURE? TWO THINGS THE FLOWING OF THE RELATIVE WIND THE DIRECTION OF THE RELATIVE WIND
1ST LAW: Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it. 3RD LAW: For every action there is an equal and opposite reaction. AT CRUISE COSTANT ALTITUDE
MINIMUM MANEUVERING SPEED SLOW FLIGHT
STALL PA-28 SERIES
WHAT IS THE DEFINITION OF FOIL? TO PREVENT FROM BEING SUCCESSFUL TO THWART
AIRFOIL • Any surface designed to deflect the airflow passing over it or striking it, and thereby obtaining an useful reaction AN AIRFOIL IS AN AIR DEFLECTOR
AIRPLANE WING. • AILERONS. • SLATS • LANDING FLAPS. • VERTICAL STABILIZER. • RUDDER. • HORIZONTAL STABILIZER. • ELEVATOR/STABILATOR • TRIM TABS. • PROPELLER. • ROTOR BLADE. FUSELAGE. FEARING. STRUTS.
A FORCE CREATED BY A DEFLECTION OF AIR AND PRESSURE DIFFERENTIAL AROUND AN AIRFOIL. IS CALLED LIFT WHEN IT ACTS UPWARD. WHEN IT ACTS DOWNWARD IS CALLED NEGATIVE LIFT. WHEN IT ACTS SIDEWAYS IS CALLED SIDE LIFT. WHEN IT ACTS FORWARD IS CALLED THRUST
HOW IS LIFT CREATED? AIR PASSING BY AN AIRFOIL DEFLECTION -- ISSAC NEWTON AIR’S CHANGE OF DIRECTION--BERNOULLI'S PRINCIPLE PRESSURE DIFERENTIAL-- BERNOULLI'S PRINCIPLE
THRUST • Thrust is a reaction force described quantitatively by Newton's second and third laws. When a system expels or accelerates mass in one direction the accelerated mass will cause a proportional but opposite force on that system.
LIFT • LIFT is a reaction force described quantitatively by Newton's second and third laws. When a system expels or accelerates mass in one direction the accelerated mass will cause a proportional but opposite force on that system. • Thrust is LIFT DIRECTED FORWARD.