RE: [TCML] Plastic paint bucket cap.

["Dave Halliday" <dh@xxxxxxxxxxxxxx>]

Hi Christopher,

Key issue with a cap is __surface_area__ and not the internal volume of one
pole.

Think about this for a bit and then think of just how many beer bottles you
could fit into the same area described by your cylinder.

Two examples:

#1) - Your big bucket is 9" in diameter and 10 inches tall.
#2) - You have three beer bottles and they are 3" in diameter and 10 inches
tall.

Circumference = Pi*diameter
Cylinder surface area = circumference*height

#1) - 9*3.141 = 28.269 and 28.269*10 = 282 Sq. In.
#2) - 3*3.141 = 9.423 and 9.423*3 = 28.269 and 28.269*10 = 282 Sq. In.

And with option #2, you can pack at least two more 3" beer bottles in the 9"
circle described by #1.
Allowing for a bit larger container, you can pack nine or more bottles and
yield three times the capacitance as with your single-wall large cylinder.


Use your treasure for something else and start collecting Corona beer
bottles or start saving the $50 or so needed to get an MMC cap set.


Dave

> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx 
> [mailto:tesla-bounces@xxxxxxxxxx] On Behalf Of Christopher Karr
> Sent: Saturday, December 06, 2008 3:42 PM
> To: Tesla Pupman List
> Subject: [TCML] Plastic paint bucket cap.
> 
> 
> I've been thinking, lately, about making a capacitor, similar 
> to a beer-bottle capacitor, out of a plastic bucket. The 
> bucket that I have I found whilst dumpster-diving and 
> consists of a large bucket, maybe ten gallons, and a lid and 
> a cap near the center that can screw off.
> 
> Considering the size of it, I'd fill it partially with water, 
> add a good deal of sodium bicarbonate (baking soda), and put 
> the lid on. I'd put in a 1/2" copper pipe that's bent to keep 
> it from escaping the hole, and fill the rest of the hole with 
> caulk. I'd wrap the outside with a BUNCH of heavy-duty 
> aluminum foil, and that would be my outer plate.
> 
> Please tell me if there's a chance that this even MIGHT work. 
> The bucket is gray, so it's unlikely that it has any carbon 
> content. It was also used for storing plaster, so it is even 
> more unlikely, because the carbon would leach into the 
> plaster and make it darker colored.
> 
> I'm looking for a capacitor that can stand up to 20kV at 60mA 
> and have a capacitance above 10nF.
> 
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