What is the "Vs1" speed for the C-172SP?

The "Vs1" speed, also known as stall speed in a specified configuration, is a critical performance metric for aircraft. For the Cessna 172SP, this speed is important for ensuring safe operational practices, particularly during takeoff and landing phases when the aircraft may be operating near stall conditions.

In the context of the C-172SP, the "Vs1" speed is specifically defined as the stall speed in a clean configuration without flaps, which is 48 KIAS (Knots Indicated Airspeed). This speed is a vital reference for pilots to maintain an adequate margin above stall during various flight maneuvers, especially when operating in critical flight regimes such as approach and takeoff.

Understanding and recognizing "Vs1" allows pilots to safely operate the aircraft, preventing unintentional stalls by ensuring they remain above this speed. The other values provided do not accurately represent the C-172SP's stall speed in its clean configuration, thus further reinforcing that 48 KIAS is the correct and essential figure for safe flight operation.