[Vspd] 항공기 속도

In aviation, V-speeds (Velocity speeds) are standardized terms used to describe certain airspeeds that are crucial for safe flight operations, particularly during takeoff and landing.

These speeds are essential for pilots to understand and adhere to, as they are designed to optimize the performance and safety of an aircraft under various conditions.

Here’s a detailed explanation of some key V-speeds commonly used in airline operations:

 

1. V1 (Takeoff Decision Speed)

• Definition: V1 is the speed by which the decision to continue or abort the takeoff must be made. Before reaching V1, the pilot must decide to abort the takeoff if there’s a significant issue (such as an engine failure or other major malfunction). After passing V1, the aircraft must take off, as there isn’t enough runway left to safely abort the takeoff.
• Importance: V1 is critical because it marks the point of no return. Continuing the takeoff after this speed ensures that there is sufficient runway left to achieve the necessary speed for liftoff. It also helps to ensure that the aircraft can safely achieve a height of 35 feet above the runway, even if an engine fails just after reaching V1.

2. Vr (Rotation Speed)

• Definition: Vr is the speed at which the pilot initiates the action to lift the nose of the aircraft off the runway, known as "rotation," to begin the climb.
• Importance: Properly managing Vr is crucial for a smooth and efficient takeoff. Rotation must be timed correctly to avoid premature liftoff, which could lead to stalling, or delaying the liftoff, which might result in insufficient runway to safely get airborne.

3. V2 (Takeoff Safety Speed)

• Definition: V2 is the speed at which the aircraft must be flying when it reaches a height of 35 feet above the runway, following an engine failure. It is also the minimum safe speed for the aircraft to climb out on a single engine.
• Importance: V2 ensures that the aircraft has sufficient lift and control to continue climbing, even under adverse conditions such as an engine failure. It provides a safety margin above the stall speed and ensures that the aircraft has the required climb gradient.

4. Vlo (Landing Gear Operating Speed)

• Definition: Vlo is the maximum speed at which the landing gear can be safely extended or retracted.
• Importance: Operating the landing gear above this speed could lead to structural damage or failure of the landing gear system. Therefore, observing Vlo is essential for maintaining the integrity of the aircraft's gear.

5. Vle (Landing Gear Extended Speed)

• Definition: Vle is the maximum speed at which an aircraft can fly with the landing gear extended.
• Importance: Vle is important because it accounts for the aerodynamic drag and structural limitations when the landing gear is extended. Exceeding this speed could result in excessive stress on the aircraft structure.

6. Vmc (Minimum Control Speed)

• Definition: Vmc is the minimum speed at which the aircraft is controllable with the critical engine inoperative, under specific conditions.
• Importance: Flying below Vmc with an engine out could result in a loss of control, as the aircraft might not have enough speed for the remaining engine(s) to maintain directional control.

7. Vf (Flap Speed)

• Definition: Vf is the maximum speed at which the aircraft can be flown safely with the flaps extended to a certain position.
• Importance: This speed is critical because flaps, when extended, increase lift but also increase drag. Operating at or below Vf ensures that the flaps can safely perform their function without causing structural damage or excessive stress on the aircraft.

8. Vref (Reference Speed)

• Definition: Vref is the reference landing approach speed, typically 1.3 times the stall speed in the landing configuration.
• Importance: Vref is used as the target speed during the final approach to landing. It provides a safety margin over the stall speed, ensuring a stable approach and safe landing.

9. Vs (Stall Speed)

• Definition: Vs is the minimum steady flight speed at which the aircraft is controllable.
• Importance: Knowing Vs is essential for avoiding unintentional stalls, which could lead to loss of control. Pilots must ensure that during all phases of flight, particularly during takeoff and landing, the aircraft remains above this speed.

10. Vmo/Mmo (Maximum Operating Speed)

• Definition: Vmo is the maximum operating speed for the aircraft, while Mmo is the maximum operating Mach number.
• Importance: Exceeding Vmo/Mmo can lead to structural damage, loss of control, or other safety-critical issues. These speeds are determined by the aircraft's structural design limits and the need to avoid aerodynamic issues like shock waves at high speeds.

 

Summary of Importance

Understanding and adhering to V-speeds is crucial for several reasons:

• Safety: Each V-speed is carefully calculated to ensure the safe operation of the aircraft, particularly during critical phases of flight like takeoff and landing.
• Performance Optimization: Properly managing speeds like V1, Vr, and V2 ensures that the aircraft performs efficiently, maximizing fuel efficiency and minimizing wear and tear.
• Compliance: V-speeds are part of regulatory requirements set by aviation authorities like the FAA (Federal Aviation Administration) and EASA (European Union Aviation Safety Agency). Adherence to these speeds is mandatory for legal operation.

These V-speeds are specific to each aircraft model and can vary based on factors like aircraft weight, runway conditions, and weather. Pilots are trained extensively to use these speeds correctly, as they are a fundamental part of safe and effective flight operations.