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Article #4895Re: ELECTRIC CARS MUST BE CARBON FIBRE 300KG (NOT 3 TONNES!)
From: BruceS
Date: Tue, 14 Aug 2012 14:25
Date: Tue, 14 Aug 2012 14:25
42 lines
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3664 bytes
On Aug 14, 3:20 am, "Trevor" <tre...@home.net> wrote: > "Sylvia Else" <syl...@not.at.this.address> wrote in message > > news:a8tm07Fup4U2@mid.individual.net... > > > On 14/08/2012 7:55 AM, Graham Cooper wrote: > >> Electric Cars will need a 5 KILOWATT Engine > >> (2 AIRCONDITIONERS WORTH OF POWER) > > >> NOT a 100KW ENGINE (50 AIRCONDITIONERS POWER) > > > The power requirements of a vehicle are not just a function of its mass. > > At higher speeds, wind resistance is a major factor, This is particularly noticeable with bikes. My fuel use on my bikes doesn't really change much from having a passenger, despite the substantial proportional increase in mass. My smaller motorcycle weighs something like 200Kg, so even a 60Kg passenger affects the acceleration. OTOH, speed makes a huge difference. Long stretches of freeway speeds, which generally *help* cars vs. stop & go driving, reduce the bike efficiency. > Pretty easy to make cars fairly aerodynamic at legal speeds these days. Of course that adds cost though, and may add mass as well. Again with the bikes, you'll notice that models really oriented at high speed use have a lot of fairings to clean them up aerodynamically. > >and won't be changed by making the vehicle lighter. > > You have to make the passengers lighter as well! That's the hard part these > days :-( No! Just don't *have* passengers! As long as we're using super- lightweight vehicles powered by solar cells, why not make them completely remote-controlled, or better yet robotic, as well? We could all settle back like Jabba, having everything brought to us while we lose the need for movement. Oh, and we could instruct our electric robot cars to send angry emails to everyone while following some random car we've decided we should own.
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From: BruceS <bruces42@hotmail.com>
Newsgroups: sci.skeptic,aus.tv,aus.cars
Subject: Re: ELECTRIC CARS MUST BE CARBON FIBRE 300KG (NOT 3 TONNES!)
Date: Tue, 14 Aug 2012 07:25:33 -0700 (PDT)
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