High altitude balloon payload, from Sable-3 discussion |
High altitude balloon payload, from Sable-3 discussion |
Sep 26 2007, 11:16 PM
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#101
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Founder Group: Chairman Posts: 14433 Joined: 8-February 04 Member No.: 1 |
http://www.unmannedspaceflight.com/index.p...20&start=20
We began talkin about a UMSF balloon - and who know what might happen if enough people think about something hard enough, thoroughly enough and long enough. How's about this as a starting point. http://vpizza.org/~jmeehan/balloon/ with http://www.chem.hawaii.edu/uham/part101.html as an important regulatory start point (I'm going to look up the UK regs for this as well) http://www.srcf.ucam.org/~cuspaceflight/nova1launch.html is also very impressive - all done in the UK This http://www.makezine.com/blog/archive/2007/...video_podc.html is particularly impressive - I like the multiple-cameras slant. Anyway - thought I'd get a thread going - this is an idea I like too much to let it gather dust in a corner - the one thing that I think would be nice to achieve is self-portraiture of some sort - think Beagle 2's WAM etc....perhaps in a corner of the FOV of one of/the imaging system. What sort of limit's should we set ourselves? 1kg 10x10x20cm? (sort of 2U Cubesat-on-a-diet budget) Doug |
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Feb 27 2008, 03:52 AM
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#102
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Senior Member Group: Members Posts: 3419 Joined: 9-February 04 From: Minneapolis, MN, USA Member No.: 15 |
Free fall is the key way of describing it. A satellite in orbit is always falling towards the Earth, at the standard rate at which any object falls toward the Earth from that height. It's just going fast enough in a vector, as Nick pointed out, transverse to "down" that the Earth's curved surface falls away from the satellite as fast as the satellite falls toward it.
You can experience free-fall without being in orbit -- most well-known is the KC-135 "vomit comet" trainers that NASA flies, which basically have the airplanes fall freely along a diving arc for about 40 seconds at a time. But you can observe the same effect in an elevator that falls down a shaft without touching the walls. Both you and the elevator would be falling at the same rate, so you would experience "weightlessness" while both of you fell. (You'd experience very short-term but extremely high G-forces when you got to the bottom of the shaft, though...) -the other Doug -------------------- “The trouble ain't that there is too many fools, but that the lightning ain't distributed right.” -Mark Twain
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Feb 27 2008, 04:07 AM
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#103
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Newbie Group: Members Posts: 7 Joined: 23-February 08 Member No.: 4053 |
Free fall is the key way of describing it. A satellite in orbit is always falling towards the Earth, at the standard rate at which any object falls toward the Earth from that height. It's just going fast enough in a vector, as Nick pointed out, transverse to "down" that the Earth's curved surface falls away from the satellite as fast as the satellite falls toward it. -the other Doug Interesting now i understund much better. Can you tell me why then if we have some balloon at (for example) on 30-40km altitude (when burst) payload must fall on Earth? And then something above 100km never fall? |
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Feb 27 2008, 07:06 AM
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#104
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Senior Member Group: Members Posts: 2173 Joined: 28-December 04 From: Florida, USA Member No.: 132 |
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