Fuel Canister Tray (for cold weather)
by walter, published
If you've tried to use gas canisters in the cold, you've probably noticed that they don't work well. This is usually because the fuel is too cold to vaporize. This problem gets worse as the canister is used (the vaporization cools the canister) and as the fuel level gets low (there may be less propane in the mix.
The tray also works well to hold the canister in place when packed inside a pot of similar diameter. The raised feet help with stability on rocky surfaces.
Take a look at adventuresinstoving.blogspot.com/2011/11/practical-cold-weather-gas-tips.html and the related articles for more info on using canister stoves in cold weather.
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Thanks for the tips! I'll have to redesign it to hold more water, hopefully before I head back up to Yosemite this Thursday. I usually use whitegas (Soto Muka) in the winter, but I'll bring the canisters for testing.
I really like your Adventures In Stoving blog btw, a lot of really good information there that can't be found anywhere else.
Well, it's a pretty cool design... but I don't think it would hold enough water to make a significant difference. You need two things a) sufficient thermal mass and b) sufficient contact between the water and the canister to allow thermal conduction.
In terms of how much thermal mass is sufficient, ideally you want more water than fuel. In other words if you have 110g of fuel, you want more than 110g of water. Of course if you use warmer water, you don't have to have as much water.
In terms of contact, you want a lot of water touching the canister. Immersing the canister up to the point where the canister start to curve into the valve is about right. In other words, you want the canister mostly submerged in order to allow the heat of the water to be conducted to the fuel inside the canister. It will work with less, but it will work better with more.
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Print up-side down as shown in the renderings, without support material.
Optional: Use 3mm x 3mm cylindrical magnets in the tray. This will cause the tray to stick to the canister. The holes are sized for my printer, you may need to use glue or drill them out slightly to compensate for differences in tolerances.
Fill the tray with water when using the canister in cold weather.
Take a picture of your tray in use and post it in the "made" section.
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