DIY Alcohol Stove Cask Stove Jet stove Coil Alcohol Stove アルコールストーブ自作 アルミ缶 アルコール ストーブ 作り方 編 

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着火するところ見ると丸めたパイプの下側に小さい穴が開いているような

It's the alcohol vapour that is ignited. The liquid is in the copper pipe! (Not all the way to the loop) You must warm-up the copper loop with a small blow torch. A small hole is drilled at the bottom of the loop facing upward! The drilled holes diameter will determine the force of the jet! Small hole will be high force, bigger hole will be less force So, now when you warm-up the loop with the torch... The liquid in the pipe will turn to a vapour combust and be forced out of the drilled hole...that is the "Jet" Once the jet is flowing, it will turn more liquid to vapour and cause a chain reaction until the loop cools down too much or all the Alcohol is used up!🤔