Aerodynamics Flashcards
Name the 3 axis of the airplane
Longitudinal (Roll)
Vertical (Yaw)
Lateral (Pitch)
What is parasite drag?
Skin friction drag
Increases as speed increases
Double airspeed and then parasite increases by 4Xs
Cut airspeed in 1/2 and then parasite drag will become 1/4
What in induced drag?
Drag caused by AOA as you increase lift
Slower you go the more AOA then more induced drag
What is Max L/D?
Lowest point of overall drag
Max range
Max distance glide
What are the 4 turning tendencies?
Torque- propeller turning to the right, tries to roll the airplane to the left
spiraling slipstream- propeller creates a spiral of air that contacts left of the tail causing yawing motion to the left
P-factor -right side of propeller, descending blade has a higher angle of attack, yaws to the left
Gyroscopic precession- propeller acts like a gyroscope
What are the 3 different types of parasite drag?
1) skin friction drag -smooth the surface the less drag
2) form drag -result of an objects general shape in relation to relative wind
3) Interference drag -generated by the mixing of airflow streamlines between the airframe components such as the wing and fuselage… as it flows around it interacts well or not well either minimizing or creating more drag
Why does induced drag decrease in ground effect?
Ground effect reduces the effectiveness of your wingtip vorticies… reduction in down wash, and allows you to maintain a slightly lower AOA which reduces your induced drag as well.
What is the lateral axis of the aircraft?
Pitch
What is the longitudinal access of the aircraft?
Roll
What is the vertical axis of the plane?
Yaw
What V speed is drag the lowest?
Vs
When does induced drag start to form?
When does parasite drag start to form?
What is adverse yaw?
Adverse yaw is the tendency of an airplane to yaw in the opposite direction of the turn. For example, as you roll to the right, your airplane may initially yaw to the left.
Keep coordinated to counter adverse yaw.
When are wingtip vortices the greatest?
Heavy, clean, and slow…
Clean b/c high AOA