Gravity turn | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-10-05

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Gravity_turn


00:01:18 1 Launch procedure
00:01:27 1.1 Vertical climb
00:03:35 1.2 Downrange acceleration
00:05:44 2 Descent and landing procedure
00:06:51 2.1 Deorbit and reentry
00:08:21 2.2 Landing
00:09:46 3 Guidance and control
00:10:23 3.1 Launch
00:12:27 3.2 Landing
00:14:03 4 Limitations
00:18:17 5 Use in orbital redirection
00:19:40 6 Use in spaceflight
00:21:06 7 Mathematical description



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Voice name: en-GB-Wavenet-D


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SUMMARY
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A gravity turn or zero-lift turn is a maneuver used in launching a spacecraft into, or descending from, an orbit around a celestial body such as a planet or a moon. It is a trajectory optimization that uses gravity to steer the vehicle onto its desired trajectory. It offers two main advantages over a trajectory controlled solely through the vehicle's own thrust. 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 angle of attack.  This minimizes transverse aerodynamic stress on the launch vehicle, allowing for a lighter launch vehicle.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 gravitational slingshot; the difference is that a gravitational slingshot often increases or decreases spacecraft velocity and changes direction, while the gravity turn only changes direction.