Outcome 7.4 Aerodynamics — How Design Choices and Loading Shape Aircraft Performance

Aeronautics

The broad discipline concerning the science, engineering, and operation of aircraft.

Aerodynamics

The focused subfield that studies how air moves and interacts with objects, especially aircraft.

Lift

The force that directly opposes the weight of an aircraft and holds the aircraft in the air.

Drag

The aerodynamic force that opposes an aircraft's motion through the air.

Center of Gravity (CG)

The point where an aircraft's weight can be considered to act, crucial for stability.

Weight and Balance

The process of verifying that an aircraft's total weight and CG are within approved limits.

Configuration

The controllable or design-related setup that changes an aircraft's aerodynamic characteristics.

Flaps

High-lift devices that increase wing camber and allow greater lift at lower speeds.

Parasite Drag

Drag that arises from the shape of the aircraft and increases with speed.

Induced Drag

Drag that results from the generation of lift, affected by angle of attack.

Stall Speed

The minimum speed at which an aircraft can maintain level flight.

Trim

Adjustments that set a control surface to maintain a given attitude without constant pilot input.

Moment

The turning effect of a weight about a reference point or datum.

High-lift devices

Devices like flaps and slats designed to increase lift during low-speed conditions.

Control Authority

The effectiveness of control surfaces in managing the aircraft's attitude and motion.

Aft CG

A location of the center of gravity that can lead to reduced stability and increased stall risk.

Forward CG

A location of the center of gravity that can increase stability but make the aircraft less controllable.

Critical Angle of Attack

The angle at which airflow separates from the wing, resulting in stall.

Configuration Change

An alteration in the setup of an aircraft that affects lift, drag, stability, or control.

Speed Brakes

Devices designed to increase drag and help reduce speed during flight.

Spoilers

Control surfaces that disrupt airflow over the wing to reduce lift and increase drag.

Aspect Ratio

The ratio of wing length to average wing width, affecting drag and maneuverability.

Wing Loading

The amount of weight per unit area of wing, influencing stall speed and performance.

Cruise Efficiency

The effectiveness of an aircraft in maintaining speed and altitude with minimal drag.

Configuration Trade-off

The balance between lift and drag that pilots must manage when changing aircraft setup.

Human Factors

Considerations of how human abilities and limitations affect flight operations.

Flight Operations

The procedures and actions taken by pilots during various phases of flight.