Chuck V., Reddog, Boy, I'm sure glad we got that settled. I was loosing a hellova lot of sleep trying to figure that one out :-) :-).
Art -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Chuck Voboril Sent: Tuesday, August 01, 2006 11:35 PM To: [email protected] Subject: [F500] Torque at 150 MPH Red Doggie, Don't really need a steam engine afterall. Assuming zero acceleration at steady state speed (and no mistakes in the SI vs English conversions) Using classic equation for drag force in Newtons using your Cd, frontal area, density of the medium, and speed in m/s. N=1/2*Cd*A*rho*v^2 I came up with 675.4 Newtons SI which converts to 151 ft-lbs. English Then, a motor which produces 72 HP at 2500 RPM will have the required 151 ft-lbs. 10.1" radius tires, 1:1 gearing at 2500 rpm speed(MPH)=RPM*tire radius/(168*gearing) You do have a very valid point that HP cannot be ignored. It is totally tied to HP and RPM. However, since RPM was free, I used it to my advantage. Chuck >From: [EMAIL PROTECTED] >Reply-To: [email protected] >To: [email protected] >Subject: RE: [F500] F100000000 >Date: Tue, 1 Aug 2006 08:19:05 -0600 > >Hmmm, that's interesting. OK, here's a questions: >How much torque, at what RPM, with what overall gearing and tire >rolling radius would one need to make a car with a CD of 0.6, and a >frontal area of >0.5 m^2 go 150 MPH in air with a density of 1.2 kg/m^3? And since >power doesn't matter, can it be done with less than 72 hp (without a >tailwind or going downhill)? > >;) > >On Mon, 31 Jul 2006 20:44:07 -0700, Chuck Voboril wrote > > Physics don't lie, doggy. :-> > > HP only determines acceleration. > > > > Fundamental differnence betweeen power and energy. > > Chuck > >________________________________ >FormulaCar Magazine - A Proud Supporter of Formula 500 The Official >Publication of Junior Formula Car Racing Subscribe Today! >www.formulacarmag.com or 519-624-2003 _________________________________ > > > >_______________________________________________ >F500 mailing list - [email protected] >To unsubscribe or change options please visit: >http://f500.org/mailman/listinfo/f500 >*** Please, DO NOT send unsubscribe requests to the mailing list! *** ________________________________ FormulaCar Magazine - A Proud Supporter of Formula 500 The Official Publication of Junior Formula Car Racing Subscribe Today! www.formulacarmag.com or 519-624-2003 _________________________________ _______________________________________________ F500 mailing list - [email protected] To unsubscribe or change options please visit: http://f500.org/mailman/listinfo/f500 *** Please, DO NOT send unsubscribe requests to the mailing list! *** ________________________________ FormulaCar Magazine - A Proud Supporter of Formula 500 The Official Publication of Junior Formula Car Racing Subscribe Today! www.formulacarmag.com or 519-624-2003 _________________________________ _______________________________________________ F500 mailing list - [email protected] To unsubscribe or change options please visit: http://f500.org/mailman/listinfo/f500 *** Please, DO NOT send unsubscribe requests to the mailing list! ***
