Carbon12 wrote:space junk generally does not use thrusters to maintain or change orbit and orientation
titleist1 wrote:Carbon12 wrote:space junk generally does not use thrusters to maintain or change orbit and orientation
neither do certain satellites or they would run out of thruster fuel
Gekko wrote:Being an an aircraft mechanic it never ceases to amaze me how the media really has no clue WRT aviation. Then you get all the old pilot "experts" who flew a DC-3 back in the day giving "clues".
We always get a few laughs watching the reports. .........
titleist1 wrote:Here we go....spacecraft attitude control without thrusters....
http://digitalcommons.usu.edu/cgi/viewc ... t=smallsat
Starting at the top of page 14 where it discusses CMG's, Control Moment Gyro's ..... through page 17 where it starts talking about 3 CMG systems so that 3 axis control is possible.
Even though thrusters are still on the spacecraft, their use is minimal and solely used for orbit adjustment (which is very rare) rather than attitude control. The CMG's are battery powered, recharged via the solar arrays and battery life through power management algorithms far exceeds thruster fuel. There is some other really neat stuff in that paper relating how they track accurate attitude data to make sure the spacecraft orientation is really what they think it is.
Carbon12 wrote:Yes gyros can control spacecraft orientation. They cannot correct for natural and inevitable orbital decay.
Carbon12 wrote:Chinese are saying one of the pieces is over 200 feet long. How would that be possible?