Pilot Training Flashcards
What are the 4 forces that act on an airplane?
Lift Weight Thrust Drag
What is Relative Wind?
The total amount of wind acting on the aircraft
What is Lift?
the force that picks the airplane up off the ground
Which forces are equal at steady unaccelerated flight?
Weight and lift
What is the cross section of the wing called?
Air foil
What are the 2 types of drag?
Induced and Parasitic
What are the three types of Parasitic Drag?
Form Drag, Interference Drag, Skin Friction Drag
What is Form Drag?
Wind that goes around the shape of the aircraft
What is interference Drag?
Different streams of airflow create different pockets of turbulence which restrict and disrupt the smooth air flow
What is Skin Friction Drag?
Drag caused by uneven/rough surfaces on an aircraft
What is Induced Drag?
Drag directly caused by lift
What is Thrust?
A force that propels aircraft forward
Which type of Drag decreases as speed increases?
Induced Drag
Which type of Drag increases as speed increases?
Parasitic Drag
What is the most efficient speed to overcome Parasitic and Induced drag called?
LD Max
What is bernoulli’s Principle?
A principle that states the faster a fluid moves the less pressure it has
What is Properller Wash?
Wind caused by a propeller
What are two ways to increase lift?
Increasing camber of the wing and increasing angle of attack
What is a stall?
A rapid loss of lift
What is the line called between the leading and tailing edge of an airfoil?
Chord Line
What dictates the angle of attack?
The angle between relative wind and the chord line
What is boundary layer seperation?
When laminar flow is disrupted and the wind over the top of the wings ceases to cling, usually caused by high angles of attack
Do stalls occur at a specific angle of attack?
Yes
Can weight or altitude change what angle of attack an aircraft stalls at?
No
Can weight or altitude change what speed an aircraft stalls at?
Yes
What happens when you exceed your critical angle of attack?
You will induce a stall
