On Fri, May 3, 2013 at 7:19 PM, Ben Potter <b...@bpuk.org> wrote: > I clearly hadn't had my morning cuppa when I sat down with that lot - since > the frontal area is wrong too. 0.79 is closer and gives 77% efficiency > required for a US 200 mpg. The original would be a reasonable for a bus.
Well, not quite: 2 m2 is a typical number for sedans, and 3m2 is a typical minivan: http://ecomodder.com/wiki/index.php/Vehicle_Coefficient_of_Drag_List The smallest production cars seems to be Porche 914 and Mazda Miata---Miata electric conversion is apparently popular due to the advantageous mechanical layout, and here we have another reason why it's a smart idea. Having said that, it's Cd*A that counts, and not surprisingly the best CdA numbers are from experimentals like Volkswagen Concept (.15 [m2]), Aptera (.28) and GM EV1 (.37). Best production cars start just short of .5 (Honda Insight , CRX), with the typical numbers between .55, and .7 aerodynamicDrag(CdA)stats-productionCars.png<https://mail.google.com/mail/u/0/undefined> The rear is dishonourably brought up by Dodge RAM (1.7) and Mercedes G-class (1.56) :) ------------------------------------------------------------------------------ Get 100% visibility into Java/.NET code with AppDynamics Lite It's a free troubleshooting tool designed for production Get down to code-level detail for bottlenecks, with <2% overhead. Download for free and get started troubleshooting in minutes. http://p.sf.net/sfu/appdyn_d2d_ap2 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
