Malaysia Triple 7

Re: Malaysia Triple 7

PostBy: Carbon12 On: Wed Mar 12, 2014 7:06 pm

Mmmmm,....space junk generally does not use thrusters to maintain or change orbit and orientation.
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Re: Malaysia Triple 7

PostBy: grumpy On: Wed Mar 12, 2014 7:09 pm

Carbon12 wrote:Mmmmm,....space junk generally does not use thrusters to maintain or change orbit and orientation.



This is true...
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Re: Malaysia Triple 7

PostBy: titleist1 On: Wed Mar 12, 2014 7:23 pm

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
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Re: Malaysia Triple 7

PostBy: grumpy On: Wed Mar 12, 2014 7:27 pm

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


All satellites use fuel, and yes they do run out, when they run out determines there life expectancy..
grumpy
 

Re: Malaysia Triple 7

PostBy: titleist1 On: Wed Mar 12, 2014 7:32 pm

stand by....i gotta run out for a while but i have been searching for something that i can post that will shed some light on how they are controlled without thruster fuel.
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Re: Malaysia Triple 7

PostBy: grumpy On: Wed Mar 12, 2014 7:34 pm

I'll welcome that info...
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Re: Malaysia Triple 7

PostBy: samhill On: Wed Mar 12, 2014 7:49 pm

Thanks a lot Gekko, just offering an opinion not unlike anyone else except that with you & a very few others I guess I'm not entitled to one. Guess that's one of our biggest differences, I still grieve for all the lost soles on board if indeed that is the wreckage. That is if it's OK with you. :bang:
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Re: Malaysia Triple 7

PostBy: titleist1 On: Wed Mar 12, 2014 8:51 pm

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.
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Re: Malaysia Triple 7

PostBy: SMITTY On: Thu Mar 13, 2014 10:05 am

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. .........

The media has no clue about ANYTHING. :lol: Even a simple car accident - when you know the parties involved, you can see how far off track the media gets. It happens with EVERY accident too.

Then just wait until they report on GUNS! Oh my Lord ..... :shock: :lol:

Motorcycles? Completely clueless.

The only thing the media is good at is SPINNING a story as far from what actually happened as possible. Just tune in to your favorite MSM station at 18:00 .......
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Re: Malaysia Triple 7

PostBy: Carbon12 On: Thu Mar 13, 2014 10:13 am

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.


Yes gyros can control spacecraft orientation. They cannot correct for natural and inevitable orbital decay.
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Re: Malaysia Triple 7

PostBy: titleist1 On: Thu Mar 13, 2014 11:20 am

Carbon12 wrote:Yes gyros can control spacecraft orientation. They cannot correct for natural and inevitable orbital decay.


Very True.

Spy satellites are not in a low enough earth orbit to worry about orbital decay using up their thruster fuel before some other component reached its end of life causing them to be intentionally ditched.
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Re: Malaysia Triple 7

PostBy: Carbon12 On: Thu Mar 13, 2014 11:25 am

Actually, by optical necessity, most spy satellites must be in low earth orbit which subjects them to tremendous orbital decay.

http://ngriffin360.hubpages.com/hub/Geo ... -Orbit-GPS
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Re: Malaysia Triple 7

PostBy: Carbon12 On: Thu Mar 13, 2014 11:49 am

Me thinks future commercial airliners will have always on satellite tagging devices just like many big rig trucks and rail cars have now. I'm surprised they don't already. :shock:
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Re: Malaysia Triple 7

PostBy: Richard S. On: Thu Mar 13, 2014 11:54 am

Carbon12 wrote:Chinese are saying one of the pieces is over 200 feet long. How would that be possible?


If you can have a plane crash land into the water, stay fully intact and have everyone live why would that seem strange?
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Re: Malaysia Triple 7

PostBy: Carbon12 On: Thu Mar 13, 2014 12:04 pm

I was basing that on the fact that the Chinese said there were three pieces of wreckage. I really wish they would find the plane.
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