![]() In general aviation aircraft, the most commonly used and most safety-critical airspeeds are displayed as color-coded arcs and lines located on the face of an aircraft's airspeed indicator. ![]() They are expressed by the aircraft's indicated airspeed (and not by, for example, the ground speed), so that pilots may use them directly, without having to apply correction factors, as aircraft instruments also show indicated airspeed. The actual speeds represented by these designators are specific to a particular model of aircraft. Using them is considered a best practice to maximize aviation safety, aircraft performance, or both. These speeds are derived from data obtained by aircraft designers and manufacturers during flight testing for aircraft type-certification. ![]() ![]() ![]() In aviation, V-speeds are standard terms used to define airspeeds important or useful to the operation of all aircraft. A single-engined Cessna 150L's airspeed indicator indicating its V-speeds in knots ![]()
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