On Nov 12, 2015, at 11:59 AM, Ing. Marco Antonio Gaxiola via EV <ev@lists.evdl.org> wrote:
> Considering the rule of EVs efficiency of 250Watt-hr per mile on a 2500 lbs > compact car, May it apply same in order to calculate the energy efficiency > of a prototype motorcycle? We had this discussion a little while back. Motorcycles, as it turns out, have pretty miserable aerodynamics. Your best bet for this sort of back-of-the-envelope sort of estimation would be to use ICE efficiency as a proxy. If you start with a car that gets about 30 MPG and do an electric conversion and get a BEV that does 3 miles per kWh, you can figure that, if you start with a motorcycle that gets about 30 MPG...after electric conversion, it, too, will also do about 3 miles per kWh. (Pulling numbers out of my...ear...to illustrate the principle. I'm certain that's not the actual resulting relative efficiencies, but it shouldn't be *too* far off.) There's lots you can do to improve the aerodynamics of a motorcycle, with a simple front fairing being the best bang for the buck. The ultimate expression of that would be the velomobile, a fully-faired recumbent bicycle that can cruise at freeway speeds with about the power consumption of an hairdryer. As in, champion cyclists can do it unassisted, at least for a little while...and weekend warriors can do it indefinitely with a single-kilowatt electric assist. To make math easy, figure 1500 W for 60 MPH, which gives you 40 miles per kWh or 0.025 kWh/mile. Cheers, b& -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 801 bytes Desc: Message signed with OpenPGP using GPGMail URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20151112/6b12b83f/attachment.pgp> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
