Melting Snow with Jetboil

[Roger Caffin]

Hi James

> At ~4500BTU I consider that too much heat for good fuel efficiency.
Not arguing. But there are times when you might make the decision that burning a bit more fuel is worth the speed. Sure, not every time.
I think the real bug was that Jetboil had these incredible claims for boiling time when they released their first stove, but those claims were totally fraudulent. We investigated them. Jetboil subsequently withdrew the claims completely.

> On gas pressure, note that everyone seems to think that boiling point is the absolute minimum.
>Not true. Water, for example, vapourizes into the air at all temps, even directly from ice,
> though it exhibits a very low vapour pressure. This rule applies to butane, n-butane, too…
>or any miscible liquids.
True, but one should add that if the vapour pressure is less than one atmosphere you don't get 'boiling' and no gas will come out of the canister. That is what boiling is: a vapour pressure equal to one atmosphere.

> Regardless of the starting temperature (at the gas pressure of the jet or regulator)
> there will always be some n-butane mixed with the propane.
Yes indeed, as illustrated by the article Stuart Robb and I wrote on this subject:
http://www.backpackinglight.com/cgi-bin/backpackinglight/effect_of_cold_on_gas_canisters.html

Cheers

[James Marco]

"I think the real bug was that Jetboil had these incredible claims for boiling time when they released their first stove, but those claims were totally fraudulent. We investigated them. Jetboil subsequently withdrew the claims completely."

I am glad someone did. I could never wrap my head around those claims when they first released the stove. Good Duty!

"True, but one should add that if the vapour pressure is less than one atmosphere you don't get 'boiling' and no gas will come out of the canister. That is what boiling is: a vapour pressure equal to one atmosphere."

Ha ha, I sure hope so… But in a closed container the two will always mix at any temp there is an output.

Interesting work. I had not seen that article before. Must've been about the time I joined, I think. Thanks!

[. .]

"Go buy a GST-100 for comparison"

@Roger – and where do you propose one find one? It appears that these have not been available for some time (replaced by the GST-120 Litemax). GS-100 (SS Version) is still available. Gold standard discontinued once again?

[Hikin’ Jim]

The GS-100 is every bit is good as the GST-100. It may weigh a few grams more, but it's really the same stove.

HJ
Adventures In Stoving

[. .]

There is about an ounce difference, if I recall correctly. I just had not heard mention of the ti version being discontinued, but I have not seen them for sale in perhaps a little over 2 years now. I bought an extra one when I saw them disappearing.

[Roger Caffin]

> where do you propose one find one? … Gold standard discontinued once again?
Sigh.
Marketing has been at it again. Gotta have a new product…
Gear Swap or ebay I guess.

Cheers

[Hikin’ Jim]

The GST-100 was "replaced" by the Lite-Max. I haven't used a Lite-Max, but generally it seems to generate favorable remarks here on BPL. Tough to beat a GST-100 though.

HJ
Adventures In Stoving

[Jim W.]

Per a previous post in this thread the PCS is stamped with 21. I just pulled my Sol apart to look at the jet. It's .31.

Cross sectional area of the .31 jet is 2.2 times that of the .21. Obviously able to flow a lot more gas in cold temps.

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