MYOG: SUL Remote Inverted Canister Winter Stove Update

[Roger Caffin]

Companion forum thread to: MYOG: SUL Remote Inverted Canister Winter Stove Update

Roger Caffin shows how to solve a fuel vaporisation process failure in his SUL remote inverted canister stove.

[Jerry Adams]

So, do you have to replace HS on existing stoves?

You could use copper which has twice the conduction as aluminum in the same size?

And maybe if you don’t run flat out don’t worry about it?

[DirtNap]

Fascinating and excellent work Roger. I had no idea that the heat xfer efficiency varies so much across the various alloys. I think with current research into things such as high entropy alloys, assisted with AI modeling, some day we will see light weigh alloys that approach copper’s HX capabilities.

One thing I wish stove makers would do is limit the max power of these little stoves to prevent melt down. Could be as easy as a stopping tab that prevents the control valve from reaching wasteful and dangerous output levels, especially with the recent prominence of sensitive HX pots.

I also wonder why we went away from graphite valve packing, which has much higher heat resistance. Sometimes ancient tech is the best tech.

[Jerry Adams]

One spec some people look at is time to boil an amount of water

If they allow stove to run flat out, it will have a better spec

[Roger Caffin]

Hi Jerry

So, do you have to replace HS on existing stoves?
I have sent replacement Heat Shunts to all existing customers.

You could use copper which has twice the conduction as aluminum in the same size?
Yes, but copper has more than twice the density. For the same thermal conductivity, aluminium works out lighter.

And maybe if you don’t run flat out don’t worry about it?
Exactly! And if you are not in perishingly cold weather (eg -20 C?) and you don’t run flat out, even more so.

Cheers

[Roger Caffin]

Hi Dirtnap

One thing I wish stove makers would do is limit the max power of these little stoves to prevent melt down.

As Jerry pointed out, marketing spin and claims for faster boil time seem to win out over common sense.

You have spent 8 hours getting there, 1 hour setting up camp: does an extra 1 minute to boil really make that much difference?

Cheers

[Jerry Adams]

“You could use copper which has twice the conduction as aluminum in the same size?
Yes, but copper has more than twice the density. For the same thermal conductivity, aluminium works out lighter.”

yes, but the weight savings is insignificant.  (We’ve been there before :)

if you didn’t have room to double the width of the aluminum to solve your problem, you could use copper, but I don’t think that’s an issue for your stove

[Roger Caffin]

No, not really an issue.
I found that “doubling” size of the bit which intercepts the flame was more significant. Once I have got the energy INTO the HS, then many problems go away.

Cheers

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