Definition
The total drag an airplane produces in a given configuration and flight condition, made up of parasite drag (from the shape and surface of the airplane moving through the air) and induced drag (a byproduct of producing lift). The drag profile changes whenever configuration changes, such as extending flaps, lowering the landing gear, or changing pitch attitude and airspeed.
Plain English
How much air resistance the airplane is producing right now, based on how it's set up and how it's flying. Put the gear or flaps down, or fly slower at a high pitch attitude, and the drag profile increases. Clean it up and fly at a normal cruise speed, and the drag profile decreases.
Context Anchor
Seen in takeoff and climb discussions, where extra drag can affect acceleration, climb rate, and obstacle clearance.
Derivation
Profile' here comes from the Latin 'proflare,' meaning to draw an outline or shape. In aviation it's used in the sense of 'overall picture' -- the full shape of how much drag the airplane is producing at that moment, not just one source of it.
Why Pilots Care
Managing the drag profile correctly produces the best climb performance and obstacle clearance; leaving unnecessary drag in place reduces climb rate and increases the runway distance needed to clear obstacles.
Grounding Statement
An airplane with more surfaces exposed to the airflow, or with the nose held too high, creates more drag and may climb less effectively.
Intuition Check
Do not read “profile” as a chart or pilot record here. In this context, it means the airplane’s shape and setup as they affect air resistance.
Example Sentence 1
Once a positive rate of climb was confirmed, the pilot retracted the landing gear to reduce the airplane's drag profile.
Example Sentence 2
With the gear still extended the drag profile remains high, requiring more power to maintain the desired climb rate.