What is the purpose of best glide speed?

• A. To provide maximum glide distance with an engine failure
• B. To maximize climb rate during power-off flight
• C. To reduce drag at all airspeeds
• D. To maintain altitude during maneuvering

Answer: (A)

Best glide speed is the airspeed that gives the maximum lift-to-drag ratio, meaning the airplane can glide the farthest for a given amount of altitude lost. In an engine-failure scenario, you want to convert as much of your altitude as possible into forward distance to reach a suitable landing area, so you fly at the speed where drag is minimized relative to lift. That speed results in the smallest descent angle, letting you cover the greatest distance before you land. It’s not about climbing with power off, nor about reducing drag at all speeds, and it isn’t about maintaining altitude during maneuvering.