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Mini-Penny

Posted: Mon May 12, 2008 8:56 pm
by Skidsteer
Submitted for the May Stove of the month. Just for fun.

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I don't use a penny though... :mrgreen:

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It bloomed in 1:21. No wick. Here's the bloom sequence:

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With a Heineken pot:

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I remain skeptical of the inherent effeciency of the Penny stove design in general but...this one seems to do OK. Boil in 9:08 and flame-out at 10:13. Could probably cut that by a minute or so with a conventional pot, but I haven't tried it yet.

Not too bad.

Re: Mini-Penny

Posted: Mon May 12, 2008 10:00 pm
by zelph
Interesting design Skids. Do you put just enough fuel to cover the fill holes so that there is about 1/8 inch of fuel puddled to act as priming fuel? I'm trying to figure out how it starts up.

Re: Mini-Penny

Posted: Mon May 12, 2008 10:16 pm
by Skidsteer
zelph wrote:Interesting design Skids. Do you put just enough fuel to cover the fill holes so that there is about 1/8 inch of fuel puddled to act as priming fuel? I'm trying to figure out how it starts up.


The disc in the photos is removable; Just like a penny. But it holds fuel because of it's bowl shape. Seems like just enough heated vapor sneaks out under the disc from the fill holes to to keep a flame going until the main fuel starts to vaporize. Weirdest thing is that when the stove finally dies out there is fuel in the disc still burning. Strange.

When I get time, I'm gonna freeze it to see how it does in cold temps. I figure it was worth posting because it may give someone a bright idea.

Re: Mini-Penny

Posted: Mon May 12, 2008 10:30 pm
by DarenN
oh great! i'm hardly finished the Jolgia and you come up with something else just a little outside the box. ;)
Skids is an evil man and must be stopped! 8-)

are there jets holes under the outer rim? how many? what size? or is it cappilliary wall? is the stove really a year and a half old or is your camera date wrong? i like the dull polish finish. looks great!

Daren.......

Re: Mini-Penny

Posted: Mon May 12, 2008 10:41 pm
by Skidsteer
DarenN wrote:oh great! i'm hardly finished the Jolgia and you come up with something else just a little outside the box. ;)
Skids is an evil man and must be stopped! 8-)

are there jets holes under the outer rim? how many? what size? or is it cappilliary wall? is the stove really a year and a half old or is your camera date wrong? i like the dull polish finish. looks great!

Daren.......


Heh. Camera date is wrong. This particular stove is less than a month old, but I suppose I built the first version about a year ago.

It's a capillary wall kind of, no jets sorta. You have to cut slits in a redbull can to get it to fit in a wedding tin because they're the same diameter. I theorize that the fuel travels up the slits more or less. My first version of the PMS stove used a similar technique until I discovered the perfect inside can.

Re: Mini-Penny

Posted: Tue May 13, 2008 9:58 am
by zelph
Weirdest thing is that when the stove finally dies out there is fuel in the disc still burning. Strange.


Once the bloom occurs there is no oxygen present in the center of the stove to burn. The same occurs with a Supercat, fuel is splashed/vaporized and is deposited/condensed on the bottom of your pot. When the pot is lifted off and oxygen introduced it lights up on the bottom of your pot. Same thing occurs with the Whitebox stove causing the flare-up when the pot is lifted off.

When I made the Vegetarian Stove is when I found out there is no oxygen in the center when the outer flames were burning. I had tried to put little wicks in the center of the stove but had failed to stay lit because of lack of oxygen. Kind of neat how we learn a little here and there about stoves. Stoves are fun!!!!

Re: Mini-Penny

Posted: Wed Jun 04, 2008 5:02 pm
by Ridgerunner
Skids, I like the A/T jet hole formation---nice touch ;)

Re: Mini-Penny

Posted: Fri Jun 06, 2008 5:14 pm
by Skidsteer
Ridgerunner wrote:Skids, I like the A/T jet hole formation---nice touch ;)


Thanks.

I'm famous for taking two hours to make a 15 minute stove. :lol:

Re: Mini-Penny

Posted: Fri Jun 06, 2008 6:11 pm
by zelph
He makes them look like their chrome plated :D