This approximation with impulsive maneuvers is in most cases very accurate, at least when chemical propulsion is used. ![]() It is used to determine the mass of propellant required for the given maneuver through the Tsiolkovsky rocket equation.įor multiple maneuvers, delta- v sums linearly.įor interplanetary missions, delta- v is often plotted on a porkchop plot, which displays the required mission delta- v as a function of launch date.įigure 1: Approximation of a finite thrust maneuver with an impulsive change in velocity having the delta- v given by ( 4). Such a spacecraft's delta- v, then, would be the change in velocity that spacecraft can achieve by burning its entire fuel load.ĭelta- v is produced by reaction engines, such as rocket engines, and is proportional to the thrust per unit mass and the burn time. As used in this context, it is not the same as the physical change in velocity of said spacecraft.Ī simple example might be the case of a conventional rocket-propelled spacecraft, which achieves thrust by burning fuel. It is a scalar that has the units of speed. JSTOR ( March 2014) ( Learn how and when to remove this template message)ĭelta- v (more known as " change in velocity"), symbolized as ∆ v and pronounced delta-vee, as used in spacecraft flight dynamics, is a measure of the impulse per unit of spacecraft mass that is needed to perform a maneuver such as launching from or landing on a planet or moon, or an in-space orbital maneuver.Unsourced material may be challenged and removed. ![]() Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification.
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