These Vs (Velocity of Stall) speeds are the stalling speeds for the aircraft at its maximum weight. The lower ends of the Green Arc and the White Arc depict the stalling speed with wing flaps retracted (Vs1), and stalling speed with wing flaps fully extended (Vs0), respectively. This is the Stall speed or minimum steady flight speed for which the aircraft is still controllable in a specific configuration. As a memory aid, Vs1 is the Velocity (V) of the Stall (s) with everything Inside (1 looks like the letter i for inside). Vs is the Velocity (V) of the Stall (s), or minimum steady flight speed for which the aircraft is still controllable. The beginning of the Green Arc is the power off Stalling Speed with the Gear and Flaps retracted. Now that you are familiar with Vs0, it’s easy to remember Vs1. Gear Down and Flaps Down) An easy way to remember this is to think of the Velocity (V) of Stall (s) with everything hanging Out (0) or Vs0. The Vs0 (Velocity Stall 0) represents the Stalling Speed of the aircraft configured for landing. ![]() The beginning of the White Arc is the power off Stalling Speed with gear and full flaps extended, also known as Vs0. Flaps may only be used within this range of speeds. The Flaps Operating Range is denoted by the White Arc. Remember, this is just an example, and the V-Speeds will differ based on the exact type, model and configuration of aircraft you fly. Let’s take a closer look, to determine some of these important V-Speeds. Pictured is a sample ‘Steam Gauge’ Airspeed Indicator. You will notice the colour-coded bands or arcs on the Airspeed Indicator. These are displayed as color-coded arcs and lines located on the face of an aircraft’s airspeed indicator flight instrument. General aviation aircraft depict the most commonly-used and most safety-critical airspeeds or V-Speeds on the Airspeed Indicator. This helps the pilot to visually recognize these V-Speeds and easily determine how close they are to the V-Speeds while in flight. Pilots should consult the Pilot’s Operating Handbook, or POH, for the aircraft they fly. These important V-Speeds will be published in the POH (Information Manual) for their specific Aircraft type and model.įortunately, the Airspeed Indicator in your airplane will have some of the more important V-Speeds highlighted or emphasized directly on the dial of the flight instrument. Pilots should be knowledgeable about the published V-Speeds for each type and configuration of aircraft they fly. Recommended Airspeeds (V-Speeds) are published and these airspeeds are relied on for best performance and safety of the aircraft. The resulting flight test data is used to help determine specific best practice speeds for safe operation of the aircraft. V-Speeds are Airspeeds defined for specific maneuvers in specific aircraft at specific configurations.Īircraft designers and manufacturers perform flight tests to help determine performance limitations of aircraft. So, as a memory aid, you may loosely think of “V-Speeds” as “Velocity Speeds”, but to be more accurate, the ‘V’ is for ‘Vitesse’. But, technically “Velocity” is defined as “Speed in a particular direction”. Commonly, people think in terms of “Velocity”, and it is a nice memory aid, as “Velocity” begins with “V”. Scientists and Engineers refer to Airspeeds as ‘V’ Speeds. Important aviation Airspeeds are identified and defined using standard terms. The “V” is from the French word ‘Vitesse’ which means ‘speed’ or ‘rate’. ![]() Your Aviation Acronym Decoder begins with some talk about Velocity. With Airspeeds and V-Speeds, there are dozens of Aviation Acronyms for the student pilot to learn and remember. Many aircraft, such as those with gas turbine engines, can reach a higher TAS at higher altitudes because their engines are more efficient at higher altitudes.Facebook Twitter LinkedIn Airspeed Limitations, Manoeuvring Speeds and PerformanceĪviation Acronyms can seem like Alphabet Soup! So at 10,000 feet, true airspeed is roughly 20% faster than what you read off your airspeed indicator. In fact, for every thousand feet above sea level, true airspeed is about 2% higher than indicated airspeed. Because of that, indicated airspeed will be less than true airspeed. Pressure decreases with higher altitudes, so for any given true airspeed, as you climb, fewer and fewer air molecules will enter the pitot tube. As you climb, true airspeed is higher than your indicated airspeed. True airspeed is the speed of your aircraft relative to the air it's flying through. The speed limits of the sky, like not exceeding 250 knots below 10,000 feet MSL, are all written as indicated airspeed values. It's read right off your airspeed indicator and is usually what you'll reference in the cockpit for speed changes. Here are the 4 types of airspeed, and what each means for your flying. Airspeed is more than simply reading off your airspeed indicator.
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