What does Vg represent?

Vg represents the best glide speed, which is a critical aerodynamic parameter for pilots. This speed is defined as the speed at which an aircraft achieves the greatest distance for a given altitude lost during a glide. When flying at Vg, the lift-to-drag ratio is optimized, allowing the aircraft to maximize its glide performance.

Understanding this speed is essential for pilots, especially in scenarios involving engine failure or other emergencies requiring a controlled descent without power. Maintaining Vg helps ensure the pilot can cover the longest distance possible to reach a suitable landing area or runway.

Other options, while important in their own contexts, pertain to different flight conditions. The best rate of climb is associated with gaining altitude as efficiently as possible, normal cruise speed pertains to standard flight operations, and minimum landing speed relates to the speed required for safe landing. Each of these serves distinct purposes in flight, but they do not convey the optimal performance during a glide like Vg does.