RE: my very heavy and lossy EV LandCruiser idea... :-)

["Byars, William" <wbyars@MPCProducts.com>]

Lee,
	Thanks! Looks a lot better than my calcs... Wonder where I slipped
up the numbers? Probably 'cause I was thinking to run the motor at rated
voltage, silly me... :-) Anyways, looking at your amp draw calcs makes me
think I could probably go with flooded batteries instead of YT's, though of
a small to medium size instead of the big suckers. Has there been any work
in the realm of using two different types of battery packs for different
operation modes? Say, have a pack of something like Bolder TMF's and a
higher-voltage pack of floodeds, use the Bolders whenever you want to kick
the pants off of a 'Vette off the line and use the floodeds for all other
operation modes, as well as "dump charging" of the Bolder pack a few times
to allow repeat matches. Could also connect the Bolder pack such that it
recieves all regen juice from braking for the initial re-charge. Since this
is a street vehicle, won't need to carry too big a Bolder pack, since I'd
only want it to get to 60 or 70 so on that pack. Driving a 'Cruiser at
75-80mph is pretty hair-raising as it is... :-) Is your spreadsheet
available online? Might want to do some poking and prodding with other
motors, batteries, weights etc. 
-Will

<snippage><calcs based on a ~4380 lb 4'x8' sheet of plywood held sideways...
:-)>
mph             10     20     30     40     50     60     70     80
motor HP out    1.51   4.14   8.55   15.39  25.32  38.99  57.05  80.16
efficiency      29%    52%    69%    79%    85%    88%    89%    88%
watts input     3923   5899   9235   14474  22214  33139  48052  67924
amps            14     22     34     53     81     121    175    248
minutes         326    207    126    76     48     30     20     14
range, miles    54     69     63     51     40     30     24     18

I used the aerodynamics of a 4x8 sheet of plywood sideways. I assumed
3000 lbs stripped, plus 300 lbs for motor and adapter, and 24 Optima
D750 batteries. That gives a 288v pack, so for expediency I assumed two
Advanced DC 6.7" L91 motors. They have about the right HP and voltage
when used in series.