How is Take-off Flare defined?

The definition of Take-off Flare refers to the specific phase in a flight where the aircraft transitions from level flight to a climb after becoming airborne. By focusing on the ground distance covered between lift-off and reaching an altitude of 50 feet, this definition captures the essence of the take-off flare, emphasizing the initial climb performance of the aircraft. This is a critical aspect of takeoff performance, as it involves the balance of lift, drag, and the aircraft's thrust, which are all vital for a safe ascent during the initial moments of flight.

In contrast, other definitions do not accurately pinpoint the nature of the take-off flare. The time for an aircraft to become airborne deals more with the overall performance of the aircraft during the take-off run rather than the specific transition phase. The angle of ascent after takeoff also pertains to climb performance but does not capture the intermediate steps involved in the transition from the runway, while the distance from the takeoff run to the first obstacle is related to obstacle clearance rather than the specific mechanics of the take-off flare itself. Thus, the ground distance covered between lift-off and reaching 50 feet effectively encapsulates the phase of flight known as the take-off flare.