On 18 May 2015 at 11:35, Mark Grasser via EV wrote: > Hub motors are sprung, they are in the hub, which is sprung, as in sprung > weight. >
I'm not positive, but I think the car's website has it backward. I think the following is mostly correct; engineers please set me right if not. The body of a vehicle is sprung mass, because it's suspended on springs. The wheels are unsprung mass, unless you count the limited resiliency of the tires. Old fashioned solid axles are unsprung mass. In a modern car, some suspension components are unsprung mass. A motor mounted in the wheel or fastened to a solid axle is (a fair bit of) unsprung mass. A motor mounted to the vehicle body, driving the wheels through a flexible axle shaft, is sprung mass. In this case, the drive axles are partly sprung and partly unsprung, but I don't know how to calculate the proportions. David Roden - Akron, Ohio, USA EVDL Administrator = = = = = = = = = = = = = = = = = = = = = = = = = = = = = EVDL Information: http://www.evdl.org/help/ = = = = = = = = = = = = = = = = = = = = = = = = = = = = = Note: mail sent to "evpost" and "etpost" addresses will not reach me. To send a private message, please obtain my email address from the webpage http://www.evdl.org/help/ . = = = = = = = = = = = = = = = = = = = = = = = = = = = = = _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
