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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Founder Group: Chairman Posts: 14434 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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Sep 28 2007, 12:06 PM
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#2
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Member Group: Members Posts: 593 Joined: 20-April 05 Member No.: 279 |
Here's a more-or-less self-explanatory table of altitudes with some notes. The only odd column here is the one called deg - this is the dip from the local horizontal at the listed altitude to the Earth's horizon. Higher the dip, the better the curve!
There's a few potential Mission Success Criteria here that would be good to see: personally, I think that the old tropopause feels almost too achievable with off-the-shelf weather balloons. I'd be, well, tempted to aim just a little higher...not too much, but still... km deg tempC Pa kg/m3 notes 53 7.4 +27.3 60 0.7 52 7.3 +24.3 67 0.8 51.82km - highest unmanned balloon flight 51 7.2 +21.3 76 0.9 50 7.2 +18.3 85 1.0 800km to horizon 49 7.1 +15.3 96 1.2 48 7.0 +12.3 108 1.3 47 6.9 +09.3 121 1.5 46 6.9 +06.3 137 1.7 Shuttle SRB burnout 45 6.8 +03.3 155 2.0 SpaceShipOne engine cutoff 44 6.7 +00.3 175 2.2 750km horizon 43 6.6 -02.6 198 2.6 42 6.6 -05.6 225 2.9 41 6.5 -08.6 256 3.4 40 6.4 -11.6 291 3.9 40.00 km - QinetiQ (failed) manned record attempt 39 6.3 -14.6 332 4.5 38 6.2 -17.6 379 5.2 37 6.2 -20.6 434 6.0 36 6.1 -23.6 497 6.9 35 6.0 -26.6 570 8.1 34.67km - Highest manned balloon flight 34 5.9 -29.6 654 9.4 1% reduction in gravity 33 5.8 -32.5 753 10.9 32 5.7 -35.5 869 12.7 Mars surface pressure 31 5.6 -38.5 1003 14.9 Above 99% of the atmosphere 30 5.6 -41.5 1161 17.5 29 5.5 -44.5 1346 20.5 28 5.4 -47.5 1564 24.2 27 5.3 -50.5 1821 28.5 26 5.2 -53.5 2124 33.7 25 5.1 -56.5 2523 40.6 24 5.0 -56.5 2952 47.5 23 4.9 -56.5 3453 55.6 FAI definition for the lower edge of near space 22 4.8 -56.5 4040 65.0 21 4.7 -56.5 4727 76.1 Above 95% of the atmosphere 20 4.5 -56.5 5531 89.0 500km to horizon 19 4.4 -56.5 6471 104.1 18 4.3 -56.5 7571 121.8 17 4.2 -56.5 8857 142.5 16 4.1 -56.5 10363 166.7 Above 90% of the atmosphere 15 3.9 -56.5 12125 195.1 SpaceShipOne release altitude 14 3.8 -56.5 14185 228.2 13 3.7 -56.5 16597 267.0 12 3.5 -56.5 19418 312.4 11 3.4 -56.4 22707 365.2 Approximate height of Tropopause 10 3.2 -49.9 26516 414.0 Commercial Airliners 09 3.0 -43.4 30827 467.7 08 2.9 -36.9 35688 526.6 07 2.7 -30.4 41152 591.0 06 2.5 -23.9 47274 661.2 05 2.3 -17.4 54114 737.7 250km to horizon 04 2.0 -10.9 61734 820.7 03 1.8 -04.4 70201 910.7 02 1.4 +02.1 79584 1008.1 01 1.0 +08.6 89958 1113.3 ~900m - Montgolfier Brothers, 1783 00 0.0 +15.0 101401 1226.6 |
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