theroy of flight

What are the 4 forces of flight

Lift weight drags thrust

What happens when weight is greater then Lift

The aircraft declines

What happens when Lift is greater than weight is

The aircraft climbs

What happens when drag is greater then thrust

The aircraft accelerates ( move forward fast )

What happens when drag is greater than thrust

It slows down

What is an airfoil

The cross sectional shape of a wing designed to produce lift

What is a leading edge

The front of the wing that meets the airflow first

What is trailing edge

The rear of the wing

What is the chord line

An imaginary straight line from the leading edge to the trailing edge.

What is a camber

The curve of the airfoil

What is angle of attack

The angle between the chord line and the relative airflow.

What is the critical angle of attack

The angle where maximum lift is produced. Beyond it, the wing stalls

Does pitch equal angle of attack

No. Pitch is the aircraft’s attitude; angle of attack is between the wing and the airflow

What creates lift

Airflow over the wings and angle of attack

Four things that affect lift

Airspeed, angle of attack, wing area, air density.

What is drag

The force opposing forward motion

What are the two main types of drag

Parasite drag and induced drag

Which drag is greatest at low speed

Induced drag

: Which drag increases with airspeed

Parisite drag

What are the three types of parasite drag

Form drag, skin friction drag, interference drag

What produces thrust

Engine and propeller

What happens if thrust equals drag

Straight-and-level flight at constant speed

What is weight

Force of gravity acting on the aircraft

How does extra weight affect stall speed

It increases stall speed

How does extra weight affect takeoff

Longer take off distance

What causes a stall

Exceeding the critical angle of attack

Can you stall at any speed

Yes

Stall recovery first step

Reduce angle of attack

Does low airspeed alone cause a stall

No

What causes a spin

A stalled wing with yaw

What are two conditions required for a spin

Stall and yaw

What is longitudinal stability

Stability about the pitch axis

What is lateral stability

Stability about the roll axis

What is directional stability

Stability about the yaw axis

Axes of flight

Front: Longitudinal axis?
Back: Roll.

Front: Lateral axis?
Back: Pitch.

Front: Vertical axis?
Back: Yaw.

What is adverse yaw

The aircraft yaws opposite the direction of the roll due to extra drag on the down-going wing.