Gravity turn

<p>A gravity turn or zero-lift turn is a maneuver used in launching a spacecraft into, or descending from, an <a href="/facts/Orbit/nD2TPySG">orbit</a> around a celestial body such as a <a href="/facts/Planet/rbPjE6Bx">planet</a> or a <a href="/facts/Natural_satellite/AE4KQKbq">moon</a>. It is a <a href="/facts/Trajectory_optimization/cjQAMobd">trajectory optimization</a> that uses <a href="/facts/Gravity/bqAN7DdQ">gravity</a> solely through the vehicle's own <a href="/facts/Thrust/EM04CqV7">thrust</a>. First, the thrust is not used to change the spacecraft's direction, so more of it is used to accelerate the vehicle into orbit. Second, and more importantly, during the initial ascent phase the vehicle can maintain low or even zero <a href="/facts/Angle_of_attack/v5NkMgqu">angle of attack</a>.  This minimizes transverse aerodynamic <a href="/facts/Stress_(physics)/ErAXDbbd">stress</a> on the launch vehicle, allowing for a lighter launch vehicle.
</p><p>The term gravity turn can also refer to the use of a planet's gravity to change a spacecraft's direction in situations other than entering or leaving the orbit.  When used in this context, it is similar to a <a href="/facts/Gravitational_slingshot/4sqIByot">gravitational slingshot</a>; the difference is that a gravitational slingshot often increases or decreases spacecraft velocity and changes direction, while the gravity turn only changes direction.
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Gravity turn open-in-new

Gravity turn