What is the best glide speed for the C-172SP?

The best glide speed for the Cessna 172SP is 68 KIAS (Knots Indicated Airspeed). This is the speed at which the aircraft achieves its maximum distance per unit of altitude lost when gliding. At this speed, the lift-to-drag ratio is optimal, allowing the aircraft to cover the greatest distance while descending.

Flying at this recommended speed helps ensure that the aircraft maintains control and minimizes the rate of descent. This is critical in emergency situations, such as engine failure, when a pilot needs to maximize the aircraft's glide distance to reach a suitable landing area. Maintaining the best glide speed also aids in achieving a stable and efficient glide, which is essential for safety during those critical moments.

The other speeds listed do not represent the best glide speed for the C-172SP: 100 KIAS is too fast for efficient gliding, while 129 KIAS and 163 KIAS far exceed safe glide speeds, leading to reduced lift and higher rates of descent. Ensuring adherence to the appropriate glide speed allows for better performance and safety in gliding scenarios.