Here is the plan for testing the Trangia alcohol stove vs. the Caldera Cone Sidewinder sized for the Evernew 3 cup aluminum pot (non-coated).
Both stoves will be timed how long it takes to bring 2.5 cups of water to a fast rolling boil. ( My thermos holds 2.5 cups :) )
The test will occur outside my house on a brick patio in Portland OR. Weather.com reports it's 29 deg F and wind is Calm. But I'll have a thermometer outside to get the actual temp.
Both stoves will be filled with 2 oz of "SLX" denatured alcohol. The stove and the fuel will be kept at room temperature before the test since I carry the stove and the fuel bottle on an inside coat pocket in the field.
Test Setup for the Caldera Cone:
2.5 cups of water is poured into 3 cup evernew pot, covered, and placed outside to cool down.
The Caldera Cone is put together, the 2 vargo tent stakes go in the bottom of the 2 rows of holes in the cone so that the pot doesn't slide all the way to the bottom of the cone. If I understand the directions from traildesigns, this is the proper height for alcohol stove "mode". Then the cone is set aside.
The bottom reflector is put in place, and the traildesigns "12-10" alcohol stove ( warm from inside ) goes in place on top of the reflector. The stove has 2 oz of fuel inside. ( also warm from inside ).
To prime the stove, I tip it slightly while filled with fuel until a tiny drop of fuel wets the primer tray.
Right away, I light the priming tray with a lighter and count 20 seconds to allow the stove to warm up.
After 20 seconds, The cone is placed around the stove. Then I hold the cone in place with my fingertip hooked on one of the bottom vents and gently rock the pot left to right / left to right, until it slides into the cone and settles onto the tent stakes running thru the middle. This is necessary because of the tight fit of the cone around the pot.
Finally, I'll record the start time of the test.
The test has ended once the water comes to a fast rolling boil. At this point I will record the end time and extinguish the stove.
To extinguish the stove, again I have to hold the cone in place with my fingernail hooked on a bottom vent of the cone. ( This is because of the tight fit of the cone against the pot ). The I lift the pot out of the cone and set it aside. Then using the pot holder, I remove the cone exposing the stove. Then I use the pot holder to scoot the stove off the reflector. Then using the pot holder I pickup the reflector and gently use it to cover up the top of the stove.
After 60 seconds the stove should be cool enough to handle. Then the remaining fuel is poured into a measuring cup to determine how much fuel was used. ( Ideally I would have weighed the stoved before and after, but my luggage scale simply isn't accurate enough for this. )
Test setup for the Trangia stove.
2.5 cups of water is poured into the evernew 3 cup pot, covered and placed outside to cool off.
The trangia is filled with 2 oz of SLX denatured alcohol. Both stove and fuel are warm from inside until the test begins because I carry the stove and the fuel bottle in an inside jacket pocket out int he field.
The homemade windscreen is unfolded, shaped into a pentagon and clipped in place. The wind screen is set aside.
The bottom reflector is put in place and the trangia is placed in the center of it.
To prime the stove, I put the lid on the stove while it is filled with fuel. I screw the lid on tight, but not "death-grip" tight. Just enough to engage to the rubber gasket in the lid. Then I turn the stove over, upside-down for a second or two. Then I turn it back right-side-up and quickly remove the lid. Then place the stove on the bottom reflector and light the stove with a lighter where ever it is wet with fuel. I usually hold the lighter to the top edge of the stove near the tiny holes.
Then I count 20 seconds to allow the stove to warm up. Then the "pentagon" windscreen is placed around the stove, and the pot sits covered on the windscreen.
Finally, I record the start time of the test.
The end of the test is when the water in the pot is brought to a fast rolling boil. At this point I will record the end time of the test.
Then the stove is extinguished. To extinguish the stove I use the "simmer ring" completely closed to cover the flames of the stove.
After 60 seconds the stove should be cool enough to handle. The remaining fuel will be collected in a measuring cup to determine how much fuel was used. ( Ideally I would have weighed the stoved before and after, but my luggage scale simply isn't accurate enough for this. )