Yep, areo drag is proportional to square of the speed:
1/2 * Cd * A * air density * speed^2
where
Cd == drag coefficient (you can look this up for many car models)
A == frontal area: the area of the vehicle as viewed in 2D from the
front, in meters^2
air density = roughly 1.2 kg/m^3 at standard temperature and pressure.
speed: in meters/second
will give you the resistance (i.e. force) in N (newtons).
Peri
------ Original Message ------
From: "EVDL Administrator via EV" <ev@lists.evdl.org>
To: "Electric Vehicle Discussion List" <ev@lists.evdl.org>
Sent: 26-Jul-14 2:23:20 PM
Subject: Re: [EVDL] Hybrid Mustang: batteries
On 26 Jul 2014 at 8:24, Ben Goren via EV wrote:
At 55 MPH with the 4.11 is 3000 RPM; with a single AC-51, that's 22
hp.
The single motor would be okay... At the slow end...1000 RPM is ~19
MPH. Five horsepower might not cut it by itself, and 15 MPH school
zones might be a problem...
IIRC, aero drag increases proportional to the square of the speed, and
it's
going to be pretty minimal at 15mph, no? So something just doesn't
quite
ring true here.
In fact I've driven some pretty underpowered cars, DC EV, AC EV, and
ICEV.
I've encountered some that could maintain 15-20mph just fine, but could
barely (in some cases just couldn't) make 55mph. NEVER vice versa.
David Roden
EVDL Administrator
http://www.evdl.org/
_______________________________________________
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)
_______________________________________________
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)
