"spin", HA! :-D ----- Original Message ----- From: "YES NOPE9" To: "Microcontroller discussion list - Public." Sent: Tuesday, February 09, 2010 06:54 Subject: Re: [TECH] skydive at Mach 1.2 > Just like Rossolll to put a spin on this topic ........ > gus > > >> On Feb 9, 2010, at 4:26 AM, Russell McMahon wrote: >> >> Dateline Dalan, bove Shnzhen, below Guanzho - this messge was found >> while >> serching for something more prosaic :-). >> >> People have died jumping from high altitude. >> Terminal velocity is approximately proportional to inverse air >> density. >> Energy rises as V^2.. Air density drop logarithmicaly, halving about >> every >> 4500 metres (from memory). Combine all tyhat and you can get extremely >> energetic at high altitudes. Then, go into spin. Not recommended. >> I'm told >> that ams and legs have detached. Lose consciousness and you probaby >> die. >> Maintaining stability is extxremely desirable. >> >> FWIW teriminal velocity can be found close enough by rarranging: >> >> Force = Falling mss x g = 0.5 x Rho x A x V^2 x k >> >> So Vtermianl ~~~~= sqrt(2mg/*Rhjo.A.k) >> A = frontal area and k is drag coefficinet - strt with 1 for a flat >> plate. >> >> As Rho tends to zero V tends to nasty >> >> Rho starts at 1.3 kg/m^3 at sea level and decreases as above. >> >> Russel; > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist