Aviation Aerodynamics & Flight Principles

Quiz Summary

Floating caused by the phenomenon of ground effect will be most realized during an approach to land when at

less than the length of the wingspan above the surface

Ground effect is most likely to result in which problem?

Becoming airborne before reaching recommended takeoff speed

How does the wake turbulence vortex circulate around each wingtip?

outward, upward, and around each wingtip.

In what flight condition must an aircraft be placed in order to spin?

Stalled

What is known as the angle between an aircraft's chord line and the direction of the relative wind?

Angle of Attack

If an airplane weighs 2,000 pounds, what approximate weight would the airplane structure be required to support during a 60° banked turn while maintaining altitude?

4,000

The four forces acting on an airplane in flight are

Lift, weight, thrust, and drag

The greatest vortex strength occurs when the generating aircraft is

Heavy, clean, and slow

What causes an airplane (except a T-tail) to pitch nose-down when power is reduced and controls are not adjusted?

The downwash on the elevators from the propeller slipstream is reduced and elevator effectiveness is reduced

What force makes an airplane turn?

The horizontal component of lift

What is ground effect?

The result of the interference of the surface of the Earth with the airflow patterns about an airplane

What is the relationship of lift, drag, thrust, and weight when the airplane is in straight-and-level flight?

Lift equals weight and thrust equals drag

When departing behind a heavy aircraft, the pilot should avoid wake turbulence by maneuvering the aircraft

Above and upwind from the heavy aircraft

When landing behind a large aircraft, the pilot should avoid wake turbulence by staying

Above the large aircraft's final approach path and landing beyond the large aircraft's touchdown point

The FAA says that "If a pilot is unsure of the other aircraft's takeoff or landing point, waiting approximately _ minutes provides a margin of safety that allows wake turbulence dissipation."

3

What are the two theories that explain flight?

Bernoulli's Principle and Newton's Third Law

Bernoulli's Principle

where air speed increases, pressure decreases, and vice versa

Newton's Third Law

for every action, there is an equal and opposite reaction

For our C-172, the stall happens first at the wing root and then out towards the wingtip. Why?

This helps to maintain aileron effectiveness and provides better control in a stall

What is the acronym that is used for stall recovery? What action does each letter represent?

P.A.R.E. P - Power idle A - Ailerons neutral R - Opposite rudder E - Elevator forward