Well, I thought I'd report my experience with beer can stoves!
A week or so ago I had a go at making
this stove. I tested it and, whilst it worked, sort of, I had made a couple of errors. It is important to get the top of the inner wall pretty straight, and its a good idea to avoid butchering the top seam whilst cutting out the top.
So, I made another one... fortunately I've got some canned beer in stock.
I went for a walk yesterday and tried it out. The fuel was methylated spirits. When I stopped for lunch, I was in a grassy field with no handy lumps of stone about for pot supports and I had not made a support to bring. So I simply held the pot over the lit stove for a few seconds until the outer jets lit and then plonked it down on top, blocking the inner hole. This worked fine, although it slowed down the burn rate a bit. Therewas a little bit of breeze, but it didn't seem to affect the functioning of the stove much, if at all.
The pots are the ones that came with my camping gaz twister stove. I put the stove on a little bare patch of ground, and the grass was pretty green and lush, so no risk of fire!
I had put more fuel in the stove than necessary, so I was faced with the problem of extinguishing it or wasting the rest. In the end I simply inverted one of the pots over the stove to block it's air supply.
Quite fun, all in all!
Andy