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RE: [TCML] Maxwell #31915 colossal pulse caps
Hi Hans,
Holy cow!! 345 uF @ 25 kV? As you say, even at
15 kV, that's nearly 40 kJ. Are you dead shorting
them or dumping the charge into an inductive solenoid?
I'd be pretty scared to dead shot them as this is really
BAD for the health of the capacitor(s).Of course it
would be awfully hard to design a solenoid that could
maintain its shape w/out warping under peak currents of
this magnitude! 20 kJ is about as large of pulse discharge
that I've ever experienced and that sounds like the discharge
of a center fire rifle! Actually, the kinetic muzzle energy
of a 510 grain (33 grams) bullet discharged from a .460
Weatherby magnum (elephant gun) at 2600 fps (feet per
second) or approximately 793 meters/sec is about 8100
ft. lbs. which is just shy of 11 kJ. Lots of dangerous
power in the discharge of such capacitors.
David Rieben
-------------- Original message --------------
From: Hans Schattenmeister <klugmann@xxxxxxxxxxx>
>
> I bought 3) 115 uf Caps rated for 25kV. they are in parallel, looks like I have
> the capacity to hit 107.8 kJ. so far I have not gone above 15kV. That is about
> 38.8 kJ. it sounded like a sonic boom. in fact the windows upstairs rattled.
> Herr Schattenmeister> From: FIFTYGUY@xxxxxxx> Date: Thu, 14 Aug 2008 18:33:06
> -0400> Subject: Re: [TCML] Maxwell #31915 colossal pulse caps> To:
> tesla@xxxxxxxxxx> CC: > > > > In a message dated 8/14/08 6:13:48 P.M. Eastern
> Daylight Time, > drieben@xxxxxxxxxxx writes:> > >I am now the proud papa of 3
> newly acquired Maxwell #31915> > >100 kV, .44 uF (that's right -- 440 nF!) pulse
> caps with one> > >more on the way ;^)). > > > I wondered who was doing all the
> bidding on these! Glad I didn't bid > against you. I figured whoever was trying
> to get these was looking for cheap > replacements for some existing equipment.>
> I tried looking up the specs as well, and couldn't find any for this > exact
> cap. So I took some very careful measurements on the auction pic, and > compared
> the ratios of the dimensions to the known height of the standard > terminal
> insulating assembly. I calculated the volume of the things, and decided > they
> had to be low-rep caps. > The price was good, but I need another big cap like I
> need a hole in my > head! :) Anyhow, I speculated that they *might* work OK as
> TC primary caps, > since they'd be running at a fifth of their rated voltage.
> But another thing > that bugged me was the low lifetime number of pulses - no
> telling how much > these puppies have seen, or how long they'd hold up at
> reduced voltage but more > severe-duty primary tank use. So I passed.> One thing
> I thought they might be fun for would be the "discharge a big > cap through a
> streamer off a TC" trick. I believe they will operate in the > horizontal
> position, so they should be easy to charge at the base of the > secondary. >
> Glad they went to a good home, and glad to know they went to a fellow > TCML
> member. Sorta like "keeping them in the family". If you ever want to get > rid
> of one, lemme know!> > -Phil LaBudde> Center for the Advanced Study of Ballistic
> Improbabilities> > > > > **************Looking for a car that's sporty, fun and
> fits in your budget? > Read reviews on AOL Autos. >
> (http://autos.aol.com/cars-Volkswagen-Jetta-2009/expert-review?ncid=aolaut000300
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