In Trangia burner the Carbon Felt insert make the flame more blue and extend the fire duration, have the penalty to take more time to boil, but 20 or 30 seconds. An detail, leave 2-3mm of the Carbon Felt insert above the stove hole border, this increase the flame. See the tests in topic of the Italian forum "aventureiramente": "Ingegneria del fornellino ad alcol "open flame", i dettagli che fanno la differenza" (Engineering of the "open flame" alcohol stove, the details that make the difference).

What's great about carbon felt is if the burner were to have an accidental spill less alcohol will spill out.

this is a nice looking stove, very "vintage" looking and reminiscent of the famous SVEA 123 (I still have one) BUT I see some little minor design problems: 1) it should be stable, these legs just have to do the job!, 2) the frontal opening for the simmer-ring should reach to the wire-legs, just a little space but it would make the in and out bringing of the simmer ring somehow easier, 3) the gravity center is still quite high (like with practically ALL gas stoves and most gasoline stoves), and with that shaky base I would be afraid to tip over the already narrow and high pot! (the only intelligent solution is the Trangia System (alcohol, gas and gasoline burner) where the gravity center is quite low and the base quite wide 4) I am not sure if that windbreaker function is really there, I do not see much protection, 5) that brass is just too nice to be stained by burning wood... and perhaps it does not work too well if you do not use another windbreaker around it... 6) about the performance of such pipes in the burner it is still not clear if it provides better results than Trangia and all the others

Cool thanks mate

Silly question: Aren't the tube jets angled? Producing a swirling flame? Does the direction that the felt is coiled make a difference?

Hi there .. 👍👍👍 .. thanks for that .. much appreciated. The risk of spillage (considering the Swiss lack of humour with those who try to burn down their forests) is my first consideration 😏. That the Felt holds the fuel better also reduces the tendency for leakage during storage .. although I try not to store with a full tank. I rather add less fuel and refill if necessary. Experience has shown me approximately how much fuel is needed for whatever. Also, some pundits stress that it is unwise to regularly 'burn a Trangia dry'. It apparently can lead to cracking in the tank. An added advantage .. lighting up. No need to push a Bic lighter upside down (as I have seen some 😳) into the fuel tank .. and hold it there 😳😳, especially in below zero temperatures. My experience in below freezing, the Carbon Felt 'Wick' lights up first time and stays lit. One can put a pot onto the stand immediately and not have to wait for a 'bloom'. In cold conditions, not waiting for the bloom has the flame sometimes extinguished when a pot is put on. 'berniedawgcinema' .. I believe that he has since passed away, he did some work on Trangias and Felt some time back. His channel is still active though. Once again, many thanks for taking the trouble to try the Felt .. take care ..