Re: Tincanium Boiling test

["Kevin Chisholm" <kchishol@fox.nstn.ca>]

Dear Crispin

Congratulations on your fabulous results!!  One minute to boil a litre is
amazing!! Only a week ago, we all thought that 3 minutes was good. I don't
think that anyone would presently dispute the fact that you are the you are
"The King" and are presently the "Worlds Fastest Pot Boiler."

Enjoy your Reign to its fullest while you can.... I haven't built my stove
yet. :-)

From: "New Dawn Engineering /ATEX" <crispin@newdawn.sz>
To: "Stoves" <stoves@crest.org>
Sent: Friday, January 11, 2002 9:06 AM
Subject: Tincanium Boiling test


> Dear Stovers
>
> I have tried with the only can reasonably available to me to do the 1
litre
> boiling test.  The can I have is 125 dia and 295 high.  When it has 1
litre
> in it there is still more than 50% air space.

Do you perhaps mean 125 x 195 mm? The volume of your can volume is about 3.6
litres.

Next time you go to the store for groceries, could you take along a tape
measure and see what the size of various the Juice Cans is? Do you have the
1.36 litre cans is Swaziland, 106 mm dia x 177 mm height? If not, what is
the closest you can get to this size?
>
> I put together a newspaper (4gm), grass (6gm) and pine (126gm) fire in the
> same stove I used on Monday.

What do you presently guess is the practical minimum weight of fuel you
could use to get your pot boiling in less than a minute?
>
> Because they do not have metal lids and the two I have are plastic topped,
I
> decided I would hope the boil would take place before the lid melted.

For a simple cover, may I suggest that you get a piece of aluminum foil,
make the holes in it (10 mm center hole for penny, and 3 mm vent hole) and
stretch it over the top of the can. Then hold it in place with a few turns
of stovepipe wire.

The 10 mm center hole could be cut with a razor blade, an exacto knife, or
the foil could be folded, and a 10 mm semi circle could be cut out of the
fold with scissors. The 3 mm vent hole can be punched with a nail.

Please let us know if you find this to be a practical pot cover.

 I cut
> two holes, 1 x 2mm and 1 x 10mm and put a 10 cent coin over it - about the
> size of a nickle, or a little bigger.

In Canada, our pennies are copper, about 19 mm, and our nickels are about 21
mm. Our dimes are about 18 mm, nickel, and our quarters are about 24 mm, in
nickel.
>
> The water temperature was 28 C and the ambient terperature was 32.
>
> I measures the time from initially lighting the paper (lit paper, started
> watch).
> I put the lighted basket grate in the stove, put in the pot grate, the
pot,
> and two paint can chimneys (not 3 like the other tests, so I could see the
> coin move).

I am reluctant to tell you all my secrets, but stack height is very
important. :-)  Can you make a little door on the side of your stack, with a
cover that can be easily opened for inspection of the penny at about the
time you expect boiling to commence?
>
> The fire got going very quickly as it didn't have much jammed into the
> grate.  The plastic top melted and fell in at about 40 seconds and the
water
> bubbled and hissed and bubbled noticeably at 55 seconds.  This would
> definitely have met the penny-kicking 'boiling' criterion if the lid had
> remained in place.
>
The 3 mm vent hole is very important to allow air and "hiss" to vent, to
prevent indications of a "false boil."

> Looking at the water in the can, I don't think you would have called it
> 'boiling' if you were here, but it certainly bubbled hard before 60
seconds.
>
For the purpose of the "Fast Boil Contest",  boiling is defined as the point
where the penny moves. Breathing hard doesn't count. :-) There has to be
significant steam evolution.

> The tin is so thin that the heat on the side at the water line and the
> bottom centre runs straight into steam.
>
Were there any indications of "thumping" because of nuclate boilng that may
tend to shake the pot, and move the penny before full boiling occured?

> So if any of you want to come by I can make you a (very) quick 5 cups of
> coffee, it will only take a minute.
>
Thanks indeed for your invite, but I must decline because ofthe distance.
(Its a long way from Nova Scotia to Swaziland!)

Again, my congratulations on your remarkable achievement..

Kevin Chisholm


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