Well, it is generally assumed by automotive engineers in the USA at least, that the most efficient speed in terms of lowest gasoline consumption per mile traveled is in the range of 55-60 mph.
I see nothing in the operation of the MiniCat which would change that assumption very much, unless Euro roads have more friction at high speeds ;-) ... calcs notwithstanding. J. --- Michel Jullian <[EMAIL PROTECTED]> wrote: > I was including air drag in the frictional losses, > indeed it is their main component, and does go as > the square of the velocity (air drag energy loss = > work of the drag force = 1/2 * rho * Cx * Frontal > area * v^2 * distance), so you may have missed my > point, which is that 12 kWh is probably quite enough > to run that small van 200 to 300 km at 20 to 30 > km/h. > > Your 100 km/h figure is their top speed, not the > speed for their range test, which as I said can be > easily inferred from their "200 to 300 km or 10 > hours of driving" spec as between 20 and 30 km/h. > > Cheers, > > Michel > > P.S. I am not particularly negative and have no > special information on Negre and his company, I > think the technology is very nice actually. > > ----- Original Message ----- > From: "Jones Beene" <[EMAIL PROTECTED]> > To: <vortex-l@eskimo.com> > Sent: Friday, August 01, 2008 5:35 PM > Subject: Re: [Vo]:Re: Cost per mile of CAT vs EV > (was Re: Doubly disruptive?) > > > > --- Michel Jullian wrote: > > > >> Note they say "200 to 300 km or 10 hours of > >> driving", which indicates a range test speed of > only > >> 20 or 30 km/h, which is about 4 times less than > the > >> 100 km/h you have assumed, i.e. assuming friction > >> losses going with the square of the velocity the > COP > >> could be as much as 4^2 = 16 times lower than the > >> COP you computed, IOW a COP of 8/16 = 0.5 which > is > >> much less exciting! > > > > Ha false logic on several levels. Firstly - > frictional > > losses are small in comparison to aerodynamic drag > - > > which is far greater at the 100 km/hr, which in > the > > end make the conclusion actually far more exciting > ! > > > > Jones > > > > Anyway, Michel - you are being unaccustomedly > negative > > in light of the "French Connection" to Negre... or > do > > you hear rumors that this company may not be on > > up-and-up ? > > > > > >
