Principles of Flight

As angle of attack increases

• lift decreases and induced drag decreases

• lift decreases and induced drag increases

• lift increases and induced drag decreases

• lift increases and induced drag increases

Parasite drag can be decreased by

• using flaps instead of spoilers

• polishing aircraft surfaces

• making wings shorter and thicker

• increasing induced drag

The Wright Brothers understood that they'd have to find three solutions (objectives) to three problems. Stated simply those solutions were:

• Yaw, Pitch, Drag

• Lift, Control, Thrust

• Weight, Drag, Thrust

• Parasite Drag, Induced Drag, Total Drag

The function of this control surface is to

• yaw around the vertical axis

• pitch around the vertical axis

• yaw around the lateral axis

• roll around the lateral axis

The purpose of this control surface is to

• roll around the horizontal axis

• yaw around the horizontal axis

• roll around the lateral axis

• pitch around the lateral axis

The purpose of this control surface is to

• yaw around the lateral axis

• pitch around the lateral axis

• roll around the horizontal axis

• yaw around the vertical axis

Airflow over a wing produces pressure differences due to changes in the velocity of the air. This explanation of lift is described by

• Bernoulli's Principle

• Wright's Theorem

• Wilbur's Predicate

• Orville's Postulate

The diagram illustrates the Four Forces Of Flight. Forces that oppose each other are

• Lift and Drag

• Lift and Thrust

• Drag and Weight

• Thrust and Drag

This illustration is actually a clever variation on the more aerodynamically correct:

• Angle Of Attack vs Chord Line

• Four Forces Of Flight

• Bernoulli's Principle

This model airplane displays a pronounced dihedral which functions to

• improve stability by producing more lift on the lower wing

• neutralize the lift produced by induced drag

• decrease the yaw of the aircraft around the vertical axis

• increase thrust to match increased parasite drag