Well, not quite, 1.38 L/100 km, but it rounds down, I guess.
Volkswagen shows L1 concept car in Frankfurt.
You can read about it here in a "mixed mess" of Customary and metric units,
suited to completely confusing the American consumer:
http://autos.yahoo.com/auto-shows/frankfurt_auto_show_2009/
AutoWeekend (Sept 18) uses the SI first when telling about the Smart Fortwo
Edition Highstyle car.
For example it uses "52 kW/71 hp or a 62 kW/84 hp gasoline engine." It
goes on to use only kW as the unit for power in the remainder of the article.
That's progress.
Stan Doore
Kilowatts first is a step forward.
On the other hand, the conversion doesn't seem quite right. It appears that
they are using one of those dinky metric horses (0.7355 kW) rather than a real
American (or British) horse (0.7457 kW).
Metric horsepower might be judged a little deceptive in the U
Dear All,
I have just read the article at http://www.metrication.us/content/demise-mpg
where I was struck by the first paragraph.
Even before the advent of partially- or fully-electric cars, it was
becoming increasingly apparent that the old fuel economy metric of
miles per gallon isn't as
Being a car nut and a petrolhead that's a very minor issue. Minor compared to
something that does my head in. Where the power is measured!
At the wheels?or at the flywheel?ie - rolling road? or bench?(Or - if you like
- on a rolling road but calculated for the flywheel)
The fact that it could
You can use J/m with electric cars too. I use the figure with my
electric bicycle. I convert w*h/ km to J/km. You can convert that to J/m
if desired.
Pat Naughtin wrote:
Dear All,
I have just read the article
at http://www.metrication.us/content/demise-mpg where I was struck by
the first
On 2009/09/19, at 08:36 , lps wrote:
You can use J/m with electric cars too. I use the figure with my
electric bicycle. I convert w*h/ km to J/km. You can convert that to
J/m if desired.
Dear Linus,
Thanks for your email. I would like to make two points:
1 Could you share with us some of
Pat:
Please check your 747 fuel consumption. I believe you will find more like 16
L/km.
See http://en.wikipedia.org/wiki/Boeing_747
For 747-400, max fuel is 216 840 L, max range 13450 km. At 16L/100 km, 2200 L
would suffice.
--- On Fri, 9/18/09, Pat Naughtin wrote:
From: Pat Naughtin
Almost always at the crankshaft (or flywheel if you prefer) on an engine
dynamometer. Sometimes a factor is taken for driveline to infer power at
wheels, but it is a bit of a nuisance to measure on chassis dyno (those are
mostly used for emissions/fuel economy drive cycles)
--- On Fri, 9/18/09
You are correct on the preferred practice. However, if you apply it to a 10
L/100 km fuel economy, you wind up with 100 µL/m (or even 10^-7 m² if you
further "simplify"). I believe that would be inconvenient for the average
person to use for the calculation most relevant to him.
Similarly, I
Dear John,
You're right. Once again I became confused by that stupid unit
construction L/100 km!
My note should have read:
Average Boeing 747
34 megajoules per litre (34 MJ/L) for aircraft fuel, and
1 600 litres per 100 kilometres (1 600 L/100 km) fuel consumption, then
an average Boeing 747
That is an annoying construct. I'd rather see it multiplied by 10 and be given
as L/1000 km, which could also be written as L/Mm, not that megameter is much
used, but it should be. So a typical car would be 100 L/Mm. 1000 km might be
a little light here, but I am assuming it is about a typic
My bicycle expends an average of 20 kJ/km
or
0.02 J/m (best for comparison with cars)
or
(Help me here) 20 mJ/m (yes miliJoules)
My battery is a 20 A*h 36 volt battery (LiFeO2).
Pat Naughtin wrote:
On 2009/09/19, at 08:36 , lps wrote:
You can use J/m with electric cars too. I use the figu
That would be 20 J/m.
--- On Fri, 9/18/09, lps wrote:
From: lps
Subject: [USMA:45837] Re: Fuel efficiency – joules per metre
To: "U.S. Metric Association"
Cc: "U.S. Metric Association"
Date: Friday, September 18, 2009, 8:15 PM
My bicycle expends an average of 20 kJ/km
or
0.02 J/m (best
On Friday 18 September 2009 20:15:09 lps wrote:
> My bicycle expends an average of 20 kJ/km
>
> or
>
> 0.02 J/m (best for comparison with cars)
>
> or
>
> (Help me here) 20 mJ/m (yes miliJoules)
Those figures don't match. 1 kJ/km=1 J/m. 20 A·h=72 kC, so at 36 V it holds
2592 kJ.
Pierre
Thanks. You are correct. I thought my number was too low. 20 J/m it is.
John M. Steele wrote:
That would be 20 J/m.
--- On *Fri, 9/18/09, lps //* wrote:
From: lps
Subject: [USMA:45837] Re: Fuel efficiency – joules per metre
To: "U.S. Metric Association"
Cc: "U.S. Metric Ass
I usually go about 100 km before I decide to recharge. I usually do not
run down the battery because it is hard on it.
Since I can pedal and or use the battery, I have an unlimited range. :)
Pierre Abbat wrote:
On Friday 18 September 2009 20:15:09 lps wrote:
My bicycle expends an average
17 matches
Mail list logo
