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SUGGESTION: Additions to aerodynamic, rolling resistance, fuel economy calculator.
It would be really helpful if a new column could be added that gives you wh/mi in addition to mpg. For example, you take a look at the 55mph column, it says you consume 7352.5 watts at 55mph. 7352.5 / 55 = 133wh/mi. It's a simple thing to do and saves time mentally calculating.
Please, wh/mi is really useful information!
My second request would require a little more effort. Please add a gradient function to the Aerodynamic and rolling resistance calculator. The calculator is incomplete because it's always telling you your on a level road, and most of the time your not! Knowing the power, and therefore fuel economy (completely ignoring BSFC of course) required to climb a grade is useful when designing an EV. It gives you an indication of how much power you need for your motor, and the wh/mi you'll get to size your battery pack accordingly.
(We have this part) ...........(missing this part)
.I..........................................I..... ....
V..........................................V...... .
P = (krMs) + (kaAsv2d) + (giMs)
where
P = power required (in watts)
kr= rolling resistance coefficient
M = mass of bike + rider
s = speed of the bike on the road
ka= wind resistance coefficient
A = the frontal area of the bike and rider
v = speed of the bike through the air (i.e. bike speed + headwind or – tailwind)
d = air density
g = gravitational constant
i = gradient (an approximationČ)
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I try to be helpful. I'm not an expert.
Last edited by sheepdog 44; 12-23-2013 at 11:57 PM..
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