Just been playing with the fondue fuel burner, 5ml of fuel has it burning for around 2 mins 30 secs of "useful" flame, then it takes another 30 seconds or so to dwindle out. That 5ml provides around 75kJ of heat and you need 1kJ per pound of water per degree F to raise temp. So 10ml would just about boil 1 pound of 60ish F water in 5 mins. However, that's assuming total efficiency. 1 pound is close to a pint-ish. Think the percolator is a bit over 2 pints total capacity, assuming capacity is in 5 oz cups.... so in theory, need about 20ml of fuel to boil it in 10 mins.
However, I'm thinking the fondue pot stand I've got is a bit of a heatsink, nevermind the sinkiness of the perk itself and what it will waste in steam, so I'm thinking it would take more like 20 mins to brew up fully and 40ml of fuel. Though that's a bit pessimal. Maybe about half again as much, and 15 mins more on the mark going by the fuel/stove testing here.... http://adropofrain.net/2013/05/alcohol- ... -methanol/
assuming the fondue burner is at least as efficient as something cobbled together out of tin cans.
Though I'm kinda wondering if the fondue burner wouldn't work "better" on a perk pot than many other burners because it heats that spot in the middle right under the pipe. So wondering if you could have it boiling under there, while bulk of water/coffee is not boiling, probably cooling on the way up, but providing enough pressure to cycle it at lower than total boil point, meaning you don't get the overperked "burnt coffee" problem..... on a normal burner it heats pot from the edges. I'm kinda wondering how to effectively test the perk now it's potentially going to behave different on a regular stove burner. I was hoping to get the coffee amount and run time dialed in on a stove that didn't have other variables.
Also turns out the danged stand is about a quarter inch too big to go in a coffee can, need to recalibrate my eyeball. So something else for wind shield arrangement will have to be done. Found a slightly bigger danish cookie tin that could do for the base. I guess I need quite a hole for messing with the burner and slot for the handle, so I could use a slit open coffee can for the sides. Was looking at a way to have the pot sit off the stand a little on some silicone feet, stop heat transfer to stand, theoretically bulk of pot reaches max of 212 when silicone good for 450, however, the particular bits of silicone stuff and design of stand puts them in actual flame at the moment, which is ungood, since methanol flame can go to 3500ish. As I mentioned trying to go for a "coffee appliance" here that's all in one lump and can be carted on picnics also, and contained enough you can use it under canvas/tarp if it's pissing with rain... though I think I'd wanna have 4ft clear air over the top of it, and no chance of knocks so wouldn't use it in a TD sized TD, possible in a "crouchy" say 5ft high inside coach.... as long as you get your fuel handling down to a safe art and aren't going to splash it everywhere. Mind you, I guess I'd hang an oil lantern on a 2 ft chain and think it was fairly safe, maybe reconsider with experience when I see how much heat it seems to make in a smaller space. (Ventilate, ventilate, ventilate, I know someone gonna say it... )
Was in a regular store "Do you have any different grinds", point me to the espresso grinds, derp, then they tell me Folgers says it's suitable for all coffee makers, this is Canada for you though, not a wide choice in anything. I bet if I look under coffee specialists in yellow pages there will be 30 Tim Hortons and 2 Starbucks. Yah, I've got some ideas of where to try, just happened to be there.
Jack of all trades, Doctor of rocket surgery and fellow of the noble college of shadetree meddlers. "in argentum tenax vinculum speramus"