156 lines
5.8 KiB
Plaintext
156 lines
5.8 KiB
Plaintext
From fork-admin@xent.com Wed Sep 4 11:42:23 2002
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Wed, 04 Sep 2002 01:20:08 -0400
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To: <fork@example.com>
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From: "R. A. Hettinga" <rah@shipwright.com>
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Subject: Re: Electric car an Edsel...
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Date: Wed, 4 Sep 2002 01:08:58 -0400
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tests=KNOWN_MAILING_LIST,QUOTED_EMAIL_TEXT,RCVD_IN_MULTIHOP_DSBL,
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X-Spam-Level:
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--- begin forwarded text
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Status: RO
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From: A guy who models plasma all day...
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To: "R. A. Hettinga" <rah@shipwright.com>
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Subject: Re: Electric car an Edsel...
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Date: Tue, 3 Sep 2002 22:49:20 -0600
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Bob,
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This capacitor drive idea isn't completely stupid, but neither is it well
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thought out.
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Maxwell (www.maxwell.com) makes and sells high energy density capacitors,
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called ultracapacitors. They deliver them in an air-cooled, voltage
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regulated module that will charge to 42 V and hold 128 kilojoules -- roughly
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the energy in 2 teaspoons of sugar or a bite of a donut -- and weighs 16
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kilograms. If that electrical energy could all be converted to kinetic
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energy, there's enough to get the capacitor module up to about 200 mph -- in
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a vacuum.
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Suppose you take the entire power density of the capacitor module -- 2.8
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kw/kg (~4 hp/kg!) -- and punch it through an electric motor. How much does
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the 64 hp electric motor weigh? If it were as little as 50 kg -- and I bet
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it isn't -- that capacitor and motor would have a top speed of 100 mph --
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the speed at which their energy is the 128 kJ that was initially stored
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electrically in the capacitor. And it's not at all obvious that the torque
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vs. speed characteristic of 42 V DC motors will support this, or how they do
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it without wheels, drive train, etc.
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But if they can, they can only do it in a vacuum where there is no drag!
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On to the Lunarnationals? Or would you prefer the bite of donut?
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<Somebody's .sig>
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----- Original Message -----
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From: "R. A. Hettinga" <rah@shipwright.com>
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To: "Vinnie Moscaritolo" <vinnie@vmeng.com>; "Randolph Elliott"
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<elliott@engineous.com>; <NicholasFC@aol.com>; "Duncan Goldie-Scot"
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<dgs@btinternet.com>; "G. Gruff" <g_gruff@yahoo.com>;
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<michael.frese@numerex.com>
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Sent: Monday, September 02, 2002 11:15 PM
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Subject: Re: Electric car an Edsel...
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>
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> --- begin forwarded text
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>
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>
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> Status: RO
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> Delivered-To: fork@example.com
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> From: "Adam L. Beberg" <beberg@mithral.com>
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> To: RossO <fork@ordersomewherechaos.com>
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> Cc: <fork@example.com>
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> Subject: Re: Electric car an Edsel...
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> Sender: fork-admin@xent.com
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> Date: Mon, 2 Sep 2002 21:24:47 -0700 (PDT)
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>
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> On 2 Sep 2002, RossO wrote:
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>
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> > John Waylan (who was interviewed in Wired a few years back) pulled out a
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> > 14.4 second run in the quarter mile (91mph), on a battery pack that
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> > hasn't been broken in yet. He expects to break his record next year
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> > topping his 13.1sec/99mph run a couple of years ago. He's shooting for a
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> > 12 second run.
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>
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> Battery pack, huh what???
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>
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> You dont use batteries for a 1/4 mile run, you use capacitors. MANY times
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> the energy density, and you can get the energy out fast enough. Note that
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> the battery packs are fully swapped out for recharging after each run
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> anyway, just like a gas dragster is refueled, so this wouldnt be cheating.
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> 200 MPH should be no problem.
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>
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> - Adam L. "Duncan" Beberg
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> http://www.mithral.com/~beberg/
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> beberg@mithral.com
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>
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> --- end forwarded text
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>
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>
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> --
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> -----------------
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> R. A. Hettinga <mailto: rah@ibuc.com>
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> The Internet Bearer Underwriting Corporation <http://www.ibuc.com/>
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> 44 Farquhar Street, Boston, MA 02131 USA
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> "... however it may deserve respect for its usefulness and antiquity,
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> [predicting the end of the world] has not been found agreeable to
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> experience." -- Edward Gibbon, 'Decline and Fall of the Roman Empire'
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>
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--- end forwarded text
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--
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-----------------
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R. A. Hettinga <mailto: rah@ibuc.com>
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The Internet Bearer Underwriting Corporation <http://www.ibuc.com/>
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44 Farquhar Street, Boston, MA 02131 USA
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"... however it may deserve respect for its usefulness and antiquity,
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[predicting the end of the world] has not been found agreeable to
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experience." -- Edward Gibbon, 'Decline and Fall of the Roman Empire'
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