Skyler4856

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Hmmm. Found a 2 Farad capacitor (yes, you read that right) at the rummage sale store downtown for US$30. Was sorely tempted to buy it, but I'm not sure quite what I'd need it for, other than the sheer "what??!?" factor.

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27 minutes ago, MaverickSawyer said:

2 Farad capacitor

whaaaat

what's the voltage ? Surely it's just a battery ?

EDIT : After short googling it appears to be used for high-power sound systems.

Edited by YNM

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6 hours ago, MaverickSawyer said:

Hmmm. Found a 2 Farad capacitor (yes, you read that right) at the rummage sale store downtown for US$30. Was sorely tempted to buy it, but I'm not sure quite what I'd need it for, other than the sheer "what??!?" factor.

Make an railgun. 

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8 hours ago, YNM said:

whaaaat

what's the voltage ? Surely it's just a battery ?

EDIT : After short googling it appears to be used for high-power sound systems.

24V. I did the math upon finding it and quickly realized that the cap could store energy to probably start a car.

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4 minutes ago, MaverickSawyer said:

24V. I did the math upon finding it and quickly realized that the cap could store energy to probably start a car.

Your capacitor is not this, but here is some fun information...

 

In the EU, if your capacitor meets these criteria, then it is classified as "dual use" and possession/use/manufacture/sale is strictly controlled, due to their utility in building components for nuclear detonators:

 

High energy storage capacitors as follows:
N.B.: SEE ALSO 3A201.a.
 a. Capacitors with a repetition rate of less than 10 Hz (single shot capacitors) and having all
of the following:
 1. A voltage rating equal to or more than 5 kV;
 2. An energy density equal to or more than 250 J/kg; and
 3. A total energy equal to or more than 25 kJ;
 b. Capacitors with a repetition rate of 10 Hz or more (repetition rated capacitors) and
having all of the following:
 1. A voltage rating equal to or more than 5 kV;
 2. An energy density equal to or more than 50 J/kg;
 3. A total energy equal to or more than 100 J; and
 4. A charge/discharge cycle life equal to or more than 10,000; 

 

 

Ref: 

Regulation (EC) No 428/2009

http://trade.ec.europa.eu/doclib/docs/2010/november/tradoc_146860.pdf

 

 

(skimming that document, I learned the term "splat quenching", that was fun :) )

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3 hours ago, p1t1o said:

An energy density equal to or more than 250 J/kg;

Petrol has 40 MJ/kg...

Even meat has 300 kcal/100 g or so, i.e. ~10 MJ/kg.

A meatgun is stronger than a railgun?

Edited by kerbiloid

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17 hours ago, MaverickSawyer said:

2 Farad capacitor

I have a box of 1 ohm resistors around here somewhere.  They're about the size of an AA battery.    We could mix them together and make some real life steam punk esque weapons!

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2 hours ago, Mad Rocket Scientist said:

Hydrocarbons are way better for storing energy:

So, the best space weapon is:
 

Spoiler

fat.jpg + Rogatka-1024x578.jpg

 

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17 hours ago, magnemoe said:

Make an railgun. 

Having had some time to dwell on it... the bird feeder out back keeps getting raided by squirrels. I mean, an electric fence transformer would probably be more than adequate to make the squirrels thing twice (or thrice, or more...) before raiding the feeder again, buuuut... A coilgun just sounds so much cooler. :D 

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Probably depends on what one puts in it. And there may be "squirrel proof" designs out there.

Can be interpreted as an example of negative environmental effects of feeding wild birds, as sorry as i am to state this ...

Edited by Green Baron

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16 hours ago, Green Baron said:

And there may be "squirrel proof" designs out there.

There really isn't.  Squirrels are determined little suckers. 

 

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8 hours ago, Gargamel said:

Squirrels are determined little suckers. 

A fundamental mental difference between the American and the Russian cultures.
In Russian culture squirrels are a standard of cuteness. Even more than cats who are ambivalent.

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On 11/14/2018 at 1:02 AM, Green Baron said:

Probably depends on what one puts in it. And there may be "squirrel proof" designs out there.

Can be interpreted as an example of negative environmental effects of feeding wild birds, as sorry as i am to state this ...

There is no such thing as squirrel proof... merely highly squirrel resistant. Nature will always evolve a better squirrel.

 

... Hmm. Same statement applies to idiots, too. :D 

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14 hours ago, kerbiloid said:

A fundamental mental difference between the American and the Russian cultures.
In Russian culture squirrels are a standard of cuteness. Even more than cats who are ambivalent.

I would find it hard to disagree with anybody who ranks squirrels high on the cuteness scale, but they are ingenious determined acrobatic monstrosities that will not let any engineer defeat them. 

But here's what I like to do with squirrels.    I'll find a couple as they are collecting and burying their nuts for the winter.   When they aren't looking, I go and replace the nuts with a grilled cheese sandwich.  Then, in the spring, when they go to dig up the nuts, I make sure I have a camera ready to capture the look of total shock and surprise on their fuzzy little faces as they dig up my sandwich.   So worth the effort.    

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