DBCOOPER 5 #1 February 7, 2004 Anybody know how to calculate what volulm of gas per pound you need to lift something?Replying to: Re: Stall On Jump Run Emergency Procedure? by billvon If the plane is unrecoverable then exiting is a very very good idea. Quote Share this post Link to post Share on other sites
chuteless 1 #2 February 7, 2004 I would think (I havent checked) that there should be some info about that on the web, perhaps under helium ballons, or maybe just "helium" Bill Cole Quote Share this post Link to post Share on other sites
ACMESkydiver 0 #3 February 7, 2004 encyclopedia for certain. ~Jaye Do not believe that possibly you can escape the reward of your action. Quote Share this post Link to post Share on other sites
gulaz 1 #4 February 7, 2004 QuoteAnybody know how to calculate what volulm of gas per pound you need to lift something? I think there is a darwin award that started out like this... Quote Share this post Link to post Share on other sites
kallend 2,027 #5 February 7, 2004 QuoteAnybody know how to calculate what volulm of gas per pound you need to lift something? Yes, I do.... 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
Ian84 0 #6 February 7, 2004 Oh come on........your gonna keep us all in suspense??!! Quote Share this post Link to post Share on other sites
kallend 2,027 #7 February 8, 2004 QuoteOh come on........your gonna keep us all in suspense??!! I answered the question correctly, what more do you want?... 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
airdweller 0 #8 February 8, 2004 make the density (d=m/v) reLLY LOW.------------------------------------------------------ "From the mightiest pharaoh to the lowliest peasant, who doesn't enjoy a good sit?" C. Montgomery Burns Quote Share this post Link to post Share on other sites
Blahr 0 #9 February 8, 2004 This is like that old episode of The Brady Bunch where they all had to live by exaxct words isnt it? Quote Share this post Link to post Share on other sites
quade 4 #10 February 8, 2004 http://www.geocities.com/CapeCanaveral/Hangar/9825/balloon.htmlquade - The World's Most Boring Skydiver Quote Share this post Link to post Share on other sites
kallend 2,027 #11 February 8, 2004 Quotehttp://www.geocities.com/CapeCanaveral/Hangar/9825/balloon.html UNFORTUNATELY that calculation is incorrect because it uses the atomic masses of N and O instead of the molecular masses of N2 and O2 to calculate the mass of 1 mole of air! This leads to a very large error in the result.... 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
quade 4 #12 February 8, 2004 I -think- that was just in the explanation section. The actual calculation at the bottom of the page seemed like it worked to me. Maybe I missed something.quade - The World's Most Boring Skydiver Quote Share this post Link to post Share on other sites
kallend 2,027 #13 February 8, 2004 QuoteI -think- that was just in the explanation section. The actual calculation at the bottom of the page seemed like it worked to me. Maybe I missed something. Apparently. MM of Helium = 4 MM of air (average) = 28.8 Therefore any given volume of He has approx 1/7 the mass as the same volume of air. According to Archimedes, the boyancy is the difference in masses, which is then 6/7 the mass of the air. To save PV=nRT we'll use a standard atmosphere: Density at sea level = 1.23kg/m^3 So 1 m^3 of He will lift approx 6/7 * 1.23kg. which is real close to 1kg. Which is quite different from the answer on the site you quoted. Edited to add trivia: How much more lift would you get from hydrogen? Not much even though a He atom weighs 4x as much as an H atom! MM of H2 molecule = 2, while air is approx. 28 (see above) Therefore the additional lift of H2 balloon compared to He balloon = 1/14 * 1.23kg which is less than 9% increase. Add in the Hindenberg factor, and you can see why He is more popular.... 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
DBCOOPER 5 #14 February 8, 2004 the old 6.02* 10 to the 23 deal...........Replying to: Re: Stall On Jump Run Emergency Procedure? by billvon If the plane is unrecoverable then exiting is a very very good idea. Quote Share this post Link to post Share on other sites
DBCOOPER 5 #15 February 8, 2004 QuoteI think there is a darwin award that started out like this... Kitty problemReplying to: Re: Stall On Jump Run Emergency Procedure? by billvon If the plane is unrecoverable then exiting is a very very good idea. Quote Share this post Link to post Share on other sites
skymama 37 #16 February 8, 2004 Kallend- I can't believe your brain doesn't explode from all that stuff you have in there. She is Da Man, and you better not mess with Da Man, because she will lay some keepdown on you faster than, well, really fast. ~Billvon Quote Share this post Link to post Share on other sites
kallend 2,027 #17 February 8, 2004 QuoteKallend- I can't believe your brain doesn't explode from all that stuff you have in there. What makes you think it hasn't? Actually it's easy. The secret is that I don't watch TV so there's less junk in there... 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
kallend 2,027 #18 February 8, 2004 Quotethe old 6.02* 10 to the 23 deal........... If you are going to have a number named after you, might as well go for the big one!... 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
DBCOOPER 5 #19 February 8, 2004 Borrowed from another thread. Quote"How the fuck did you work that out?" - Pythagoras Replying to: Re: Stall On Jump Run Emergency Procedure? by billvon If the plane is unrecoverable then exiting is a very very good idea. Quote Share this post Link to post Share on other sites
SkydiveMonkey 0 #20 February 8, 2004 Not to mention: Quote "Any fucking idiot could understand that." - Albert Einstein ____________________ Say no to subliminal messages Quote Share this post Link to post Share on other sites
