How can a spacecraft turn without firing a thruster? Follow the motor-driven wheel that trades angular momentum with the spacecraft, the disturbances that fill its storage range, and the external torque that makes room again.
Chapters:
00:00 The wheel turns the spacecraft
01:47 A wheel changes the craft’s aim
03:49 A small outside twist adds up
05:23 What saturated really means
06:46 Unloading gives the wheel room again
Sources and further reading:
https://www.nasa.gov/smallsat-institute/sst-soa/guidance-navigation-and-control/
https://science.nasa.gov/learn/basics-of-space-flight/chapter11-2/
https://www.jpl.nasa.gov/blog/2012/1/a-look-inside-dawns-grand-asteroid-adventure
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