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Published byGillian Summers Modified over 9 years ago
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SHOW ME A PILOT THAT CAN’T PERFORM A GIVEN TASK, & I’LL SHOW YOU A PILOT THAT DOESN’T:
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KNOW UNDERSTAND APPLY CORRELLATE
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WHAT HE/SHE IS TRYING TO “ACCOMPLISH”
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BY DIEGO M. ALFONSO SR.
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WHAT IS APPLIED AERODYNAMICS?
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TO BE ABLE TO CORRELATE THE EFFECTS OF THE AERODYNAMIC FORCES ACTING ON AN AIRCRAFT. LEFT OF COURSE IFR APPROACHES VFR X-COUNTRY GYROSCOPIC EFFECT OF THE PROPELLER
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DEVELOPS A FEEL FOR FLYING. THE TWO GROUPS OF PILOTS ALWAYS CORRECTING FOR THINGS ALWAYS ANTICIPATING THINGS KNOWLEDGE OF APPLIED AERODYNAMICS
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PERFORMING CHANDELLES LAZY EIGHTS EIGHT ON PYLONS GOING THROUGH THE MOTIONS AIRLINE PILOTS
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I AM NOT AN AERODYNAMICIST I FAILED MATH NO FANCY EQUATIONS
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THIS DISCUSSION WILL BE VERY BASIC. APOLOGIES ARE IN ORDER FOR THE ADVANCED PILOTS.
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THIS DISCUSSION IS BASED ON SUBSONIC AIRCRAFT.
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THE BASIC COMPONENT IN AERODYNAMICS
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AIR HAS WEIGHT
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THE AIRCRAFT DOES NOT KNOWS WHERE THE AIR MASS IS COMING FROM
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IT ONLY KNOWS RELATIVE WIND
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WEATHERVANING
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IF AIRBORNE HOW MUCH RUDDER & AILERONS?
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IF AIRBORNE WHICH WAY WILL IT WEATHERVANE?
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IF ON THE GROUND WHICH WAY WILL IT WEATHERVANE?
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IF ON TAKEOFF HOW MUCH RUDDER & AILERONS?
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“LIFT”
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THIS DISCUSSION ASSUMES KNOWLEDGE OF:
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PARTS OF AN AIRFOIL RELATIVE WIND ANGLE OF ATTACK
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AIRFOILS AIRPLANE WING. PROPELLER. ROTOR BLADE.
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HOW IS LIFT CREATED?
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BERNOULLI'S PRINCIPLE
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WHAT’S WRONG WITH THIS PICTURE?
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SIR ISAAC NEWTON LAWS OF MOTION
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3. FOR EVERY ACTION THERE IS AN EQUAL AND OPPOSITE REACTION
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WHY USE BERNOULLI'S PRINCIPLE?
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AIR DEFLECTOR AN AIRFOIL IS AN
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BASEBALL TENNIS GOLF
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INDUCED DRAG
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THE INSTRUCTOR CAN’T EXPLAIN
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WHAT IS IT?
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IT IS THE BYPRODUCT OF LIFT
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LIFT ACTS PERPENDICULAR TO THE RELATIVE WIND AND THE LATERAL AXIS OF THE AIRPLANE. “WING”
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THE ANGLE BETWEEN AVERAGE RELATIVE WIND AND THE REMOTE FREE STREAM IS TERMED INDUCED ANGLE OF ATTACK
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INDUCED DRAG INCREASES AT THE WING TIPS.
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GROUND EFFECT ALSO KNOWN AS “T EFFECT”
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WHAT IS IT?
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GROUND INTERFERENCE THAT MODIFIES THE AVERAGE RELATIVE WIND AND SHIFTS THE LIFT VECTOR FORWARD AND CLOSER TO THE VERTICAL
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OUT OF GROUND EFFECT IN GROUND EFFECT
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THREE FACTORS ARE AFFECTED BY GROUND EFFECT. INDUCED RELATIVE WIND. DOWNWARD DEFLECTION OF AIR. WING TIP VORTICES.
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WHAT DO THE AILERONS DO?
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THE RUDDER WHAT DOES IT DO?
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WHAT DO THE ELEVATORS DO?
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WHAT DOES THE HORIZONTAL STABILAZER DO? FORWARD CG REARWARD CG. CENTER CG.
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WHAT DO THE STABILATOR DO?
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WHAT DOES THE ANTI-SERVO TAB DO?
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THE CLIMB?
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WHY APPLYING POWER FIRST IS NOT RECOMMENDED?
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WHAT HAPPENS WHEN YOU PITCH UP?
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A-MORE THAN 2,000 lbs. B- LESS THAN 2,000 lbs. C- JUST 2,000 lbs.
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WHY DOES THE AIRPLANE SLOWS DOWN ON A CLIMB?
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RECOVERY FROM A CLIMB.
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ATTITUDE AIRSPEED POWER TRIM
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IF DESCENDING 60 DEGREES BANK HOW MANY G ’S?
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OVERBANKING TENDENCY
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LEVEL TURNS SHALLOW BANK LESS THAN APPROXIMATELY 20° MEDIUM BANK APPROXIMATELY 20° TO 45° STEEP 45° OR MORE
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CLIMBING TURNS
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NOTE THE POSITION OF THE STICK OR YOKE WHILE IN A STEEP TURN
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ADVERSE YAW
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HOW TO RECOVER IF LOOSING ALTITUDE DURING A STEEP TURN?
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HOW TO RECOVER IF GAINING ALTITUDE DURING A STEEP TURN?
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WHY?
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WHEN IN A DESCENDING TURN YOU ARE NOT PULLING UP, YOU ARE MAKING A TIGHT TURN.
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STALL AERODYNAMICS
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PITCH TO AN ATTITUDE THAT WILL INDUCE A STALL
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STALLING AT A SHALLOW ANGLE IN RELATION TO THE HORIZON
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STALLS ARE OUR BEST FRIENDS.
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WHAT IS A STALL? AN AERODYNAMIC RELIEF VALVE
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WHY NOSE DOWN FIRST THEN POWER?
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RECOVERY: WITHOUT POWER “TRAINING ONLY”
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WHAT HAPPENS IF YOU DON’T RECOVER FROM A STALL?
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MANEUVERING SPEED VA
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FACTS ABOUT VA
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WHY IS Va A SLOWER AIRSPEED WHEN THE AIRPLANE IS LIGHTER ?
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TO HAVE A GREATER ANGLE OF ATTACK.
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INCREASE IN WEIGHT INCREASES STALL SPEED.
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DECREASE IN WEIGHT DECREASES STALL SPEED.
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VA IS HALF THE LOAD FACTOR TIMES VS
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THE LOAD FACTOR USED NOW IS 3.8, SO HALF THE LOAD FACTOR IS 1.9.
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THE EQUATION IS 1.9 X VS = VA.
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AN A/C @ 3,900 # STALLS @ 80 MPH 1.9X80MPH=152 MPH
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AN A/C @3000 # STALLS @ 65 MPH 1.9 X 65 = 123 MPH
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VS FOR THIS EXAMPLE IS 80 MPH. 1.9 X 80 = 152 MPH.
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SLOW FLIGHT STALL BEFORE EXCEEDING LOAD FACTOR
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