Heres a bit of a digression as well using physics - In this course I am doing we were discussing the use of crack mechanics to form things from metal, and apparently there was/is (?) a project going on at Ford to try to form brake discs using cracking, so that you just take a plate of metal the right thickness, give it a jolly good whack in all the right places, and if all goes to plan a circular crack is formed in the shape of a brake rotor and the job is done. I recon that would be impressive to see.
Sunday, June 23, 2002, 1:28:35 PM, you wrote: TR> Yes. A frame full of helium would have more mass than a frame under TR> complete vacuum, therefore gravity would exert a larger force on the TR> helium cos of one of Newton's laws, Force = mass * acceleration (ie even TR> though helium is lighter than air, it's still heavier than nothing) You TR> can't really use vacuum filled tyres though :) TR> Aren't these digressions great? Who'd have thought there was a use for TR> high school physics TR> - Tom TR> PS Maybe one of the other reasons why nitrogen is used in some forms of TR> motorsport is that it's inert, incase of a fire? TR> mark krawczuk wrote: >>hi, would u be better of with vacuum in the frame? >> >> mark k >>----- Original Message ----- >>From: "james wade" <[EMAIL PROTECTED]> >>To: <[EMAIL PROTECTED]> >>Sent: Sunday, June 23, 2002 12:39 AM >>Subject: RE: nitrogen filled tires >> >> >>>Ive heard of bmx racers using helium? These days those guys are weight >>>crazy and all, so yeah its like they want a lighter bike and all that. I >>>even heard of a guy putting helium inside his frame (ie. inside the >>>tubing). talk about kooky. >>> >>>-james >>> >>>-----Original Message----- >>>From: [EMAIL PROTECTED] >>>[mailto:[EMAIL PROTECTED]] On Behalf Of mark krawczuk >>>Sent: Saturday, 22 June 2002 8:04 PM >>>To: [EMAIL PROTECTED] >>>Subject: Re: nitrogen filled tires >>> >>> >>>i believe that some racing pushbikes use nitrogen in the tyres? >>> >>> mark k >>>----- Original Message ----- >>>From: "James Cox" <[EMAIL PROTECTED]> >>>To: <[EMAIL PROTECTED]> >>>Sent: Saturday, June 22, 2002 1:32 PM >>>Subject: RE: nitrogen filled tires >>> >>> >>>>Actually I think they do that to maintain a constant tyre pressure >>>>since nitrogen is less likely to expand with heat increases, a common >>>>practice >>>> >>>in >>> >>>>some forms of motorsport. If he really intended to make the tires >>>>lighter he should have uses helium. >>>> >>>>Jame Cox >>>> >>>> >>>>>No >>>>>I have only ever seen a bloke fill his tyres with nitrogen to make >>>>>them lighter, similar to bridge construction (true story) >>>>> >>>> >>>>_________________________________________________________________ >>>>Send and receive Hotmail on your mobile device: http://mobile.msn.com >>>> >>>> >>>--membersozdat------------------------------------------------------- >>>OZDAT Mailing List Please Note:- >>>Send (un)subscribe requests to [EMAIL PROTECTED] Send >>>submissions to [EMAIL PROTECTED] No unauthorised >>>redistribution of this email http://www.ozdat.com/ozdatonline/index.htm >>>http://www.ozdat.com/ozdatonline/listindex.html >>>http://www.mail-archive.com/[email protected]/ >>>--------------------------------------------------------------------- >>> >>> >> >> -- Best regards, Bob mailto:[EMAIL PROTECTED] --membersozdat------------------------------------------------------- OZDAT Mailing List Please Note:- Send (un)subscribe requests to [EMAIL PROTECTED] Send submissions to [EMAIL PROTECTED] No unauthorised redistribution of this email http://www.ozdat.com/ozdatonline/index.htm http://www.ozdat.com/ozdatonline/listindex.html http://www.mail-archive.com/[email protected]/ ---------------------------------------------------------------------
