hobbes4star 0 #1 July 13, 2006 http://news.yahoo.com/s/space/20060713/sc_space/spacediverpreparesforbigjumpif fun were easy it wouldn't be worth having, right? Quote Share this post Link to post Share on other sites
SKYOCEAN 0 #2 July 13, 2006 Breaking the sound barrier in freefall? Wouldn't that hurt your ears?I should have been a kickass drummer and a world famous first base man. Quote Share this post Link to post Share on other sites
Praetorian 1 #3 July 13, 2006 on the off chance you werent joking The object breaking the soundbarrier cant hear the "boom" Good Judgment comes from experience...a lot of experience comes from bad judgment. Quote Share this post Link to post Share on other sites
dontiego 0 #4 July 13, 2006 QuoteBreaking the sound barrier in freefall? Wouldn't that hurt your ears? With what noise, the one you left after yourself because your faster than it?"We call on the common man to rise up in revolt against this evil of typographical ignorance." http://bancomicsans.com Quote Share this post Link to post Share on other sites
MotherGoose 0 #5 July 13, 2006 Now that's funny . . . what do you think the freefall speed will get up to ??You think you understand the situation, but what you don't understand, is that the situation just changed. Quote Share this post Link to post Share on other sites
bch7773 0 #6 July 13, 2006 all the people trying to do a space jump keep delaying the jump over and over. I'll beleive its possible when i see it done. MB 3528, RB 1182 Quote Share this post Link to post Share on other sites
Amazon 7 #7 July 13, 2006 QuoteThe object breaking the soundbarrier cant hear the "boom" I would love to "feel" it on my toes...... I would be sooooo into that..can I volunteer anywhere???? Heck with the drouge.. I would just make it a SPEED SKYDIVE.... Quote Share this post Link to post Share on other sites
billvon 2,397 #8 July 13, 2006 >I'll beleive its possible when i see it done. Well, it's been done. They just want to do it again, from a bit higher. Quote Share this post Link to post Share on other sites
MF42 0 #9 July 13, 2006 [pedant] The internationally recognized "boundary" of space is an altitude of 100 km, about 62 miles. If he does it, many records will be set but it won't be a "space" jump. [/pedant] Matt Quote Share this post Link to post Share on other sites
piisfish 135 #10 July 13, 2006 do a search for Fournier in here, bonfire, french forum... Hell, he should be in the SCAM forum....scissors beat paper, paper beat rock, rock beat wingsuit - KarlM Quote Share this post Link to post Share on other sites
Guest #11 July 13, 2006 haha...yea, if it happens, that'll be cool! but that is.....if it happens... Quote Share this post Link to post Share on other sites
SKYOCEAN 0 #12 July 14, 2006 I was joking, thanks...I saw on nightline a few weeks back a guy back in the 60's did this from a balloon. Just as he reached the outside of the atmosphere as he could see the curve of the earth he jumped and lived. Don't remember the particulars but it happened.I should have been a kickass drummer and a world famous first base man. Quote Share this post Link to post Share on other sites
mjosparky 3 #13 July 14, 2006 QuoteI was joking, thanks...I saw on nightline a few weeks back a guy back in the 60's did this from a balloon. Just as he reached the outside of the atmosphere as he could see the curve of the earth he jumped and lived. Don't remember the particulars but it happened. Col. Joe Kittinger: http://www.af.mil/history/person.asp?dec=&pid=123006518My idea of a fair fight is clubbing baby seals Quote Share this post Link to post Share on other sites
Acoisa 0 #14 July 14, 2006 Quote>I'll beleive its possible when i see it done. Well, it's been done. They just want to do it again, from a bit higher. I don't know where they got this footage... looks kinda real... http://www.youtube.com/watch?v=hvyu929iIbY&search=skydive%20space Quote Share this post Link to post Share on other sites
mdrejhon 8 #15 July 15, 2006 Apparently, it's popping up all over the mainstream news websites yesterday and today. I wonder what's gonna happen... MSNBC http://msnbc.msn.com/id/13842223/ CNN http://www.cnn.com/2006/TECH/space/07/14/space.diver/index.html SPACE.COM http://www.space.com/news/060713_big_jump.html Quote Share this post Link to post Share on other sites
SKYOCEAN 0 #16 July 15, 2006 Awwww he's gonna be in a capsule? What a baby. When Col. Joe Kittinger did it, he just bundled up for the ride.I should have been a kickass drummer and a world famous first base man. Quote Share this post Link to post Share on other sites
mdrejhon 8 #17 July 15, 2006 QuoteAwwww he's gonna be in a capsule? What a baby. When Col. Joe Kittinger did it, he just bundled up for the ride.According to the articles, he's allegedly going to jump out of the capsule -- and without a stabilizing drogue that Kittinger used. The capsule parachutes down separately. At least, that's how I interpreted the articles... Will believe it when it happens; just this seems to be firing up in the news lately... Quote Share this post Link to post Share on other sites
MB38 0 #18 July 15, 2006 Outside video! Outside video! I really don't know what I'm talking about. Quote Share this post Link to post Share on other sites
teason 0 #19 July 18, 2006 Doesn't the speed of sound change due to atmospheric composition temperature and density? The speed of sound is a formula, not constant. 742mph to 775 in a standard atmosphere depending on the temperature. That means that even thoungh that particular speed may be exceeded in the upper atmosphere during freefall, the speed of sound at that particular point would be extremely high and therefore no boom would take place. This means that .... oh wait .... you where joking about the boom weren't you. Sometime we geeks have no sesne of humourI would rather be a superb meteor, every atom of me in magnificent glow, than a sleepy and permanent planet. Quote Share this post Link to post Share on other sites
sixtysevengt5oo 0 #20 July 18, 2006 actually the speed of sound in the upper atmosphere would be much slower in the upper atmosphere, the further apart the molecules in the medium that the sound is passing through, the slower the speed of the sound, thats why the speed of sound along a metal pipe or a string is nearly double that of the speed of sound through the air, sorry, had to clear that up Quote Share this post Link to post Share on other sites
teason 0 #21 July 18, 2006 I think you have it backwards. The Speed of sound in the upper atmosphere is higher due to the less dense air. That is why it moves faster when it is warm and slower when it is cold. Speed of sound is c= the square root of C over P. C is the co-efficeint of stiffness and P is the density. That means that the speed of sound is increased by stiffness (like a metal pipe) but decreased by density (like cold and low atmosphere) I'll stop now, some eyes are starting to glaze over.I would rather be a superb meteor, every atom of me in magnificent glow, than a sleepy and permanent planet. Quote Share this post Link to post Share on other sites
Carver 0 #22 July 19, 2006 QuoteBreaking the sound barrier in freefall? Wouldn't that hurt your ears? heh heh. I think the sound would be along way from heard. Never try to skip a stage of natural progression... Quote Share this post Link to post Share on other sites
wiggy101 0 #23 July 19, 2006 QuoteI think you have it backwards. The Speed of sound in the upper atmosphere is higher due to the less dense air. That is why it moves faster when it is warm and slower when it is cold. Speed of sound is c= the square root of C over P. C is the co-efficeint of stiffness and P is the density. That means that the speed of sound is increased by stiffness (like a metal pipe) but decreased by density (like cold and low atmosphere) I'll stop now, some eyes are starting to glaze over. Nope! The speed of sound increases as density increases! It's not like light, which travels fastest through a vacuum and slower through, say water or glass. Sound waves need a medium to travel through, which is why they can't travel in a vacuum. Therefore the less material there is, the slower the waves will travel. Remember in space no-one can here you scream! Soooo, it would therefore be perfectly possible to break the sound barrier in freefall! Quote Share this post Link to post Share on other sites
kallend 1,623 #24 July 19, 2006 QuoteQuoteI think you have it backwards. The Speed of sound in the upper atmosphere is higher due to the less dense air. That is why it moves faster when it is warm and slower when it is cold. Speed of sound is c= the square root of C over P. C is the co-efficeint of stiffness and P is the density. That means that the speed of sound is increased by stiffness (like a metal pipe) but decreased by density (like cold and low atmosphere) I'll stop now, some eyes are starting to glaze over. Nope! The speed of sound increases as density increases! It's not like light, which travels fastest through a vacuum and slower through, say water or glass. Sound waves need a medium to travel through, which is why they can't travel in a vacuum. Therefore the less material there is, the slower the waves will travel. Remember in space no-one can here you scream! Soooo, it would therefore be perfectly possible to break the sound barrier in freefall! The effect of atmospheric pressure cancels out when you derive the wave equation for disturbances in a gas. All that is left is a temperature term (as well as some constants like the Cp/Cv ratio). So the speed of sound is lower at high altitude on account of the lower TEMPERATURE, nothing to do with the pressure. I am a professor of physics, but I don't play one on TV.... The only sure way to survive a canopy collision is not to have one. Quote Share this post Link to post Share on other sites
teason 0 #25 July 20, 2006 Ahh Too simple a formula. The real formula is speed of sound is equal to the adiabatic constant x absolute temp x gas constant all over the molecular mass! I was looking at denominator only 'cause I was thinking density and not any other factors.(c over P) By the way, I obviously do not believe that a sound wave speeds up or even moves in a vacuum That kinda hurt my feelings I was simply looking at the formula too simplisticlyI would rather be a superb meteor, every atom of me in magnificent glow, than a sleepy and permanent planet. Quote Share this post Link to post Share on other sites
