JBMatt... a black cup will radiate heat away quicker

That was an XLNT Review! I was trying to come up with a Multi-use for the Heavy Cover,to justify it's means over Alum.Foil,Not to mention Where on a Canteen Cover,Is it going to be Stowed? or Is that the Next $20 item in line for this Set-Up,A Possibly extended Canteen Cover,to allow for the HeavyCover to fit on the bottom,of the canteen cover!Possible other use's for the Heavy Cover:Bacon/Burger Press,Bug/Scorpion Smasher,Cowbell alternative for Gitfiddle Campfire Tunes,Sear Plate for cauterizing wounds,Set on edge in the dirt/sand for use as a Multiple Launch Platform for Bottle Rockets,or Incense holder for Spiritual backcountry shindigs????

You can get acrylic covers for canteen cups in the UK. obviously not as tough but you can see if it's boiling.
Anyone know how well the gel cookers for canteen cups work?
And does anyone sell the insulating foam the jetboil cup is surrounded with to fit a canteen cup.
Or would it catch fire?
qjs

Neoprene of that type that the Jetboil cozies are made of would work OK depending on what type of heating you were doing. Open flame (such as a wood fire) would probably be bad although you might be able to slide the cozy off during heating and then slide it back on afterwards.

The problem I see with using a cozy on a canteen cup is the cup's handles. You'd have to cut out a pretty big swath of the cozy in order to fit it onto the cup. I wonder how stable it would be although perhaps you could have a velcro attachment that fastened above the handles once the cozy was put into place. Seems like kind of a kludge.

HJ

Cliff,

Great review, I may have to dig out my GI rig.

HJ,

How about an old style cup with the swing handle, take off the cozy, swing the handle then put it back on. Avoid those new fangled contraptions.

The best,

Jerry

There you go, Jerry, good thought. I put it in the context of the one I have (the one with the "butterfly" handles), but the older style swing handle might indeed work better with a neoprene cozy.

Let's see, we've got our neoprene cozy, we can add a lid with a drinking hole -- what the heck? We've just created the yuppie canteen cup.

HJ

[quote=Hikin_Jim Let's see, we've got our neoprene cozy, we can add a lid with a drinking hole -- what the heck? We've just created the yuppie canteen cup.

HJ [/quote]

Only if it comes with Starbucks instant in it!!!

Jerry

Great post, Cliff!

How did you attach your bail? I didn't see any holes in your cup or anything on it. Is it just a case of my old eyes?

"...a black cup will radiate heat away quicker"

Why? I've never heard that. What is the physics of it?

Sue

Sue,

Blast or some other real scientist may need to correct the specifics, but basically it has to do with the wavelengths of radiation (such as light or heat) reflected or absorbed. For example, if something appears blue, it's actually absorbing other colors of the spectrum but reflecting blue. White is reflecting all colors approximately equally. Black is absorbing all colors (wavelengths).

Since black absorbs all wavelengths, it also radiates in all wavelengths and therefore tends to radiate heat away more quickly. Try this: go out on a hot sunny day in a black coat. Then try a white coat. Most people will experience the black coat as significantly warmer because it will absorb heat from the sun whereas the white coat will reflect it.

Another experiment is to put two objects of equal temperature, one black, one white, into a refrigerator and chart the decline in temperature. All else being equal, the black one should cool slightly faster.

HJ