(Aswer to: nntp:// )Is this actually an ultracapacitor? - it must be an accumulator?:American Institute of Physics (AIP) (2012, July 19). New ultracapacitor delivers a jolt of energy at a constant voltage. ScienceDaily: "...The novel constant-voltage design, which may one day help ultracapacitors find new uses in low-voltage electric vehicle circuits and handheld electronics, is described in the American Institute of Physics' Journal of Renewable and Sustainable Energy....So Bakhoum has designed an ultracapacitor that maintains a near-constant voltage without a DC-DC converter...."Because:C=dQ/dVOr?br,Glenn

Yes, that's an ultracap. He mechanically lowers "C" as the capdischarges, regulating voltage.I spoke to a guy working on ultracaps for EV use--he said they'regetting 25F/cm^3 with aerogels, at some fraction the weight ofLiIon, 4v, and miniscule ESR.For a 50KWhr pack (about 300 miles range), that works out toC = 22.5e6 F fitting in 900 L, if I calculated correctly.-- Cheers,James Arthur

Is this actually an ultracapacitor?

Jul 25, 2012 44 Replies

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Dave Platt 13 years ago

The Venus Equilateral stories (well, most of them) were written between 1942 and 1945. I think the "ultra-high-dielectric-constant liquid" made its appearance in the story "Firing Line" (1944) but it might have occurred earlier than that... it's been a few years since I last read through the stories.

The stories are collected in "The Complete Venus Equilateral", and are well worth reading... they portray a bunch of RF/EE types, managing a "communications relay satellite station" full of high-power vacuum tube transmitters (this was pre-transistor stuff... "Now we're cooking with glass!"), orbiting the sun at Venus's L4 point. Fun stuff, with a good dash of humor.

I don't think it's in print at the moment, but used copies are available.

Dave Platt AE6EO Friends of Jade Warrior home page: http://www.radagast.org/jade-warrior I do _not_ wish to receive unsolicited commercial email, and I will boycott any company which has the gall to send me such ads!

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legg 13 years ago

When was this?

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josephkk 13 years ago

A quick search found this:

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Says a ton is "4.184 gigajoules". A 50KWhr pack (about 300 miles range[?]) is 180 megajoules. Not that big a bang, but more than plenty = to ruin the day of everyone within, say, 300 ft (100 m). Within 30 feet (10 m) you are dead to shredded meat. So yes, there is still a safety issue.

?-)

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josephkk 13 years ago

Oops you must have meant kilograms. Oh well the numbers are there.

?-)

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John Devereux 13 years ago

Ha ha I remember that from my childhood (reprint I guess - not the 1940's!).

One story they made a matter transmitter from a scaled-up tunnel diode IIRC.

John Devereux

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