schroedera 0 #1 March 12, 2002 Well, I had to come up with some name, and Ginger was already taken. I'm designing a new product, unrelated to skydiving, and was wondering if anyone out there knows how to calculate the force exerted on a surface, given it's area, presented at 90 degrees to the wind (head on).For example, a square sail, with an area of 2m sq, in wind moving at 15m/s.I just thought some of you might be up on this sorta stuff, so post if you know!P.S.Presume it's got zero porosity. Quote Share this post Link to post Share on other sites
lazerq3 0 #2 March 12, 2002 Hey man No problem to get the formula is what you do is....................DAMN would you look at that.....another damn hangnail....great googly moogly...what was I saying????jason Quote Share this post Link to post Share on other sites
Viking 0 #3 March 12, 2002 you wanna borrow my clippers?? damn i hate hang nails!!!I swear you must have footprints on the back of your helmet - chicagoskydiver Quote Share this post Link to post Share on other sites
lazerq3 0 #4 March 12, 2002 Quoteyou wanna borrow my clippersjason Quote Share this post Link to post Share on other sites Viking 0 #5 March 12, 2002 i have two kinds, the regular nail clipper and a cutical clipper. Which would you like? Speaking of which i need to trim ma fingernails.I swear you must have footprints on the back of your helmet - chicagoskydiver Quote Share this post Link to post Share on other sites n2skdvn 0 #6 March 12, 2002 bored arn't weIt's not the fall that kills you, it'ssudden deceleration syndrome. Quote Share this post Link to post Share on other sites Viking 0 #7 March 12, 2002 not at......oh look naval lint..........I swear you must have footprints on the back of your helmet - chicagoskydiver Quote Share this post Link to post Share on other sites Beachbum 0 #8 March 12, 2002 would have to pull out the physics books (IF I still have 'em) to find the formula, but you also need to factor in the stiffness or lack thereof of the material ... a lot more air will bleed off of something rigid than something that can bow inward and trap air like a cloth sail does ... As long as you are happy with yourself ... who cares what the rest of the world thinks? Quote Share this post Link to post Share on other sites lazerq3 0 #9 March 12, 2002 Quoteoh look naval lintHEY SAVE THAT!!!! I'm trying to get enough to knit up sweater!!!!! Oh and the regular clippers should do fine thanxs!!jason Quote Share this post Link to post Share on other sites skymedic 0 #10 March 12, 2002 More like a Statics & Dynamics text...marcBSBD Quote Share this post Link to post Share on other sites skyhawk 2 #11 March 12, 2002 ill tell ya if i get 10% of the profit :)the only thing you learn at school is to memorize Quote Share this post Link to post Share on other sites Viking 0 #12 March 12, 2002 regular it is, do you want me to dye that lint for ya?? I swear you must have footprints on the back of your helmet - chicagoskydiver Quote Share this post Link to post Share on other sites lazerq3 0 #13 March 12, 2002 Quotedo you want me to dye that lint for ya?? Naaaa I'm looking for that "O" naturel look. Dont forgot any toe lint or toe jam.....it all works the same!!!!jason Quote Share this post Link to post Share on other sites quade 4 #14 March 12, 2002 q = (rho*V^2)/2One half the air density (in slugs per cubic foot) times the true air speed (feet per second) squared is the pressure in pounds per square foot.At sea level on a standard day at a speed of 100 knots (169 fps), q would be (0.002378*169^2)/2 or about 33.95 pound per square foot.For a generic calculation at sea level, keep 0.002378 for the value of rho and knock yourself out with metric conversions. Just know that rho changes with pressure and temperature.So, um, what's the product?quadehttp://futurecam.com Quote Share this post Link to post Share on other sites Viking 0 #15 March 12, 2002 sorry to say but my toe jam is not of very high quality. I don't think you want to use it. I swear you must have footprints on the back of your helmet - chicagoskydiver Quote Share this post Link to post Share on other sites skymedic 0 #16 March 12, 2002 How did I know the new green guy would have the answer for this one....marcBSBD Quote Share this post Link to post Share on other sites quade 4 #17 March 12, 2002 QuoteHow did I know the new green guy would have the answer for this one....'Cause ya know I'm a big o' geek. quadehttp://futurecam.com Quote Share this post Link to post Share on other sites skymedic 0 #18 March 12, 2002 Very true.....marcBSBD Quote Share this post Link to post Share on other sites skymedic 0 #19 March 12, 2002 Very true.....but your a skydivin geek...so that more than compensates...marcBSBD Quote Share this post Link to post Share on other sites Scratch 0 #20 March 12, 2002 Quoteq = (rho*V^2)/2I have spent the last 10 years regularly drinking myself into a coma trying to forget that I ever knew that shit.You are not helping man!!!!!!!!!!!!!!!!!!!!!!!Now pleeeeez go away BTW The metric system is much better Quote Share this post Link to post Share on other sites schroedera 0 #21 March 12, 2002 Kick-ass quade! I was starting to get discouraged listening to people describe their toe jam and naval lint!It's a camping product, and as soon as we file the patents, I'll post a sketch. So, it's not a teleporter, a hovercar, etc. But it is cool, and I can't believe I was the first to come up with it.You know, from being a regular guy (sorta...) in three months, I'll have 2 patent pendings. That's so cool...:)The other one is a braking system for streetluge. Anyways, thanks a ton (or tonne) quade! You saved me alot of time! Quote Share this post Link to post Share on other sites Remster 30 #22 March 12, 2002 QuoteOne half the air density (in slugs per cubic foot) times the true air speed (feet per second) squared is the pressure in pounds per square foot.hehehe... slugs, grains, onces.. when are you silly americains gonna see the light and use metric! lolRemsterMuff 914 Quote Share this post Link to post Share on other sites SpeedRacer 1 #23 March 12, 2002 just as soon as the brits stop weighing themselves in stones... what're you, the frickin' Flintstones??Speed Racer"Fill your hand, you son-of-a-bitch!" Quote Share this post Link to post Share on other sites Remster 30 #24 March 12, 2002 what are we? dont know about them brits.... I know Canada is metric..... kinda.. lolPS: 1st time I went to the doc herein the UK, the nurse weight me in stones, and I had NEVER heard of stones before in my life... them brits.... RemsterMuff 914 Quote Share this post Link to post Share on other sites SpeedRacer 1 #25 March 12, 2002 anyway, I'm a scientist....we've ALWAYS used metric!! (By the way I weigh 68 kg, & I'm 1.75m tall)Speed Racer"Fill your hand, you son-of-a-bitch!" Quote Share this post Link to post Share on other sites Prev 1 2 Next Page 1 of 2 Join the conversation You can post now and register later. If you have an account, sign in now to post with your account. Note: Your post will require moderator approval before it will be visible. Reply to this topic... × Pasted as rich text. Paste as plain text instead Only 75 emoji are allowed. × Your link has been automatically embedded. Display as a link instead × Your previous content has been restored. Clear editor × You cannot paste images directly. Upload or insert images from URL. Insert image from URL × Desktop Tablet Phone Submit Reply 0
Viking 0 #5 March 12, 2002 i have two kinds, the regular nail clipper and a cutical clipper. Which would you like? Speaking of which i need to trim ma fingernails.I swear you must have footprints on the back of your helmet - chicagoskydiver Quote Share this post Link to post Share on other sites
n2skdvn 0 #6 March 12, 2002 bored arn't weIt's not the fall that kills you, it'ssudden deceleration syndrome. Quote Share this post Link to post Share on other sites
Viking 0 #7 March 12, 2002 not at......oh look naval lint..........I swear you must have footprints on the back of your helmet - chicagoskydiver Quote Share this post Link to post Share on other sites
Beachbum 0 #8 March 12, 2002 would have to pull out the physics books (IF I still have 'em) to find the formula, but you also need to factor in the stiffness or lack thereof of the material ... a lot more air will bleed off of something rigid than something that can bow inward and trap air like a cloth sail does ... As long as you are happy with yourself ... who cares what the rest of the world thinks? Quote Share this post Link to post Share on other sites
lazerq3 0 #9 March 12, 2002 Quoteoh look naval lintHEY SAVE THAT!!!! I'm trying to get enough to knit up sweater!!!!! Oh and the regular clippers should do fine thanxs!!jason Quote Share this post Link to post Share on other sites
skymedic 0 #10 March 12, 2002 More like a Statics & Dynamics text...marcBSBD Quote Share this post Link to post Share on other sites
skyhawk 2 #11 March 12, 2002 ill tell ya if i get 10% of the profit :)the only thing you learn at school is to memorize Quote Share this post Link to post Share on other sites
Viking 0 #12 March 12, 2002 regular it is, do you want me to dye that lint for ya?? I swear you must have footprints on the back of your helmet - chicagoskydiver Quote Share this post Link to post Share on other sites
lazerq3 0 #13 March 12, 2002 Quotedo you want me to dye that lint for ya?? Naaaa I'm looking for that "O" naturel look. Dont forgot any toe lint or toe jam.....it all works the same!!!!jason Quote Share this post Link to post Share on other sites
quade 4 #14 March 12, 2002 q = (rho*V^2)/2One half the air density (in slugs per cubic foot) times the true air speed (feet per second) squared is the pressure in pounds per square foot.At sea level on a standard day at a speed of 100 knots (169 fps), q would be (0.002378*169^2)/2 or about 33.95 pound per square foot.For a generic calculation at sea level, keep 0.002378 for the value of rho and knock yourself out with metric conversions. Just know that rho changes with pressure and temperature.So, um, what's the product?quadehttp://futurecam.com Quote Share this post Link to post Share on other sites
Viking 0 #15 March 12, 2002 sorry to say but my toe jam is not of very high quality. I don't think you want to use it. I swear you must have footprints on the back of your helmet - chicagoskydiver Quote Share this post Link to post Share on other sites
skymedic 0 #16 March 12, 2002 How did I know the new green guy would have the answer for this one....marcBSBD Quote Share this post Link to post Share on other sites
quade 4 #17 March 12, 2002 QuoteHow did I know the new green guy would have the answer for this one....'Cause ya know I'm a big o' geek. quadehttp://futurecam.com Quote Share this post Link to post Share on other sites
skymedic 0 #18 March 12, 2002 Very true.....marcBSBD Quote Share this post Link to post Share on other sites
skymedic 0 #19 March 12, 2002 Very true.....but your a skydivin geek...so that more than compensates...marcBSBD Quote Share this post Link to post Share on other sites
Scratch 0 #20 March 12, 2002 Quoteq = (rho*V^2)/2I have spent the last 10 years regularly drinking myself into a coma trying to forget that I ever knew that shit.You are not helping man!!!!!!!!!!!!!!!!!!!!!!!Now pleeeeez go away BTW The metric system is much better Quote Share this post Link to post Share on other sites
schroedera 0 #21 March 12, 2002 Kick-ass quade! I was starting to get discouraged listening to people describe their toe jam and naval lint!It's a camping product, and as soon as we file the patents, I'll post a sketch. So, it's not a teleporter, a hovercar, etc. But it is cool, and I can't believe I was the first to come up with it.You know, from being a regular guy (sorta...) in three months, I'll have 2 patent pendings. That's so cool...:)The other one is a braking system for streetluge. Anyways, thanks a ton (or tonne) quade! You saved me alot of time! Quote Share this post Link to post Share on other sites
Remster 30 #22 March 12, 2002 QuoteOne half the air density (in slugs per cubic foot) times the true air speed (feet per second) squared is the pressure in pounds per square foot.hehehe... slugs, grains, onces.. when are you silly americains gonna see the light and use metric! lolRemsterMuff 914 Quote Share this post Link to post Share on other sites
SpeedRacer 1 #23 March 12, 2002 just as soon as the brits stop weighing themselves in stones... what're you, the frickin' Flintstones??Speed Racer"Fill your hand, you son-of-a-bitch!" Quote Share this post Link to post Share on other sites
Remster 30 #24 March 12, 2002 what are we? dont know about them brits.... I know Canada is metric..... kinda.. lolPS: 1st time I went to the doc herein the UK, the nurse weight me in stones, and I had NEVER heard of stones before in my life... them brits.... RemsterMuff 914 Quote Share this post Link to post Share on other sites
SpeedRacer 1 #25 March 12, 2002 anyway, I'm a scientist....we've ALWAYS used metric!! (By the way I weigh 68 kg, & I'm 1.75m tall)Speed Racer"Fill your hand, you son-of-a-bitch!" Quote Share this post Link to post Share on other sites
