S&L Flight – Opposing Forces are Equal

1. The sum of all upward components of forces (not just lift) equals the sum of all downward components of forces (not just weight)
2. The sum of all forward components of forces (not just thrust) equals the sum of all backward components of forces (not just drag)

Thrust – The aircraft continues to move and gain speed until thrust and drag are equal.

Lift – The pilot can control the lift. Any time the control yoke or stick is moved fore or aft, the AOA is changed. As the AOA increases, lift increases (all other factors being equal).

Warm air is less dense than cool air, and moist air is less dense than dry air. Thus, on a hot humid day, an aircraft must be flown at a greater true airspeed for any given AOA than on a cool, dry day.

Parasite Drag - Drag not associated with the production of lift. All factors that work to slow the aircraft.

Form Drag - Aircraft shape/structure

Interference Drag - intersection of airstreams that creates eddy currents, turbulence, or restricts smooth airflow

Skin Friction Drag -

When the airspeed is low, the AOA must be relatively high if the balance between lift and weight is to be maintained.

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