Popular Post igor 12,770 Posted June 3, 2020 Popular Post Report Share Posted June 3, 2020 Youngest has made a forge/furnace thing to melt beer cans. Forced draught courtesy of his mother's hairdryer. He needs a better crucible. The stainless steel jug wasn't quite up to the task. Check out jetret's experiments on youtube for more. 19 Quote Link to post Share on other sites
Popular Post tortron 63,957 Posted June 4, 2020 Popular Post Report Share Posted June 4, 2020 Made a small windshield/pot stand to use with a chafing dish warmer It's full of gelled meths, so it's pretty safe to use, can't really spill it, no fumes, nice and silent, don't need to bring another bottle of fuel like an alcohol stove, and it's basically fail safe Downside is 21minutes to bring 500ml to a rolling boil under perfect (sitting on my kitchen bench) conditions The pot holds 200g of fuel and will burn for about 3 hours. So can boil around 4.5L of water. A can costs about $2-3 Weight of my mug, windshield, and a full can comes in at about 340g. I'm going to zing some holes in the windshield where I can and try cut the gel with something to get more BTUs A home made alcohol stove should boil the same amount in under 10mins. They have the benefit of self pressurising and getting a strong flame, the gel also results in less energy than straight denatured alcohol. I might try make a round screen if it will fit inside the mug around the can (this one was just cut out of a much larger screen I have) Edit Straight meths knocks about 5 mins off the boil time in the same set up The flame gets a bit unwieldy though. I tried some stainless steel wool as a wick, which helped. But irl I don't think il bother, I also added meths to the gel until it was quite thin and it took about 1-2 mins off the boil time. Gona stick with the can as it is and perfect my windscreen Maybe something like this Thier alcohol stove is made from a beer can, seems to chooch harder than my gel and boil in half the time. Wonder if a small tube would supercharge the air intake 14 Quote Link to post Share on other sites
tortron 63,957 Posted June 5, 2020 Report Share Posted June 5, 2020 Tried some other things. One was a tin can with steel wool in it and a bunch of holes. I managed to get the gel to roar in this set up, but boil time was still about 20mins, and it was hard to extinguish and carrying two things you may as well use an alcohol stove. Seems I got it right the first time, I tried a pot stand that sits on top of the tin, but it blocked too much air and increased boil time by 3-4 mins. Modified my original shield to support the mug better and put a few holes around the bottom. There's a few ways I could force feed it some air, but it's just extra complexity and weight for minimal gains, the tin itself doesn't promote it either. I have an idea about having 2 lids and some drilled tubing like a carb emulsion tube to get oxygen inside the can but eh maybe. As a comparison, an esbit tablet (solid hexamine fuel) boils 500ml in 8-9 minutes. It leaves some gack residue on the bottom of the pot though, however easy and reliable. I might see if I can find a clean burning firelighter for cheaper. Also it's faster if you break the tablet in half for more surface area The price is right on these cans, but in 20mins I can have cooked and eaten. Note to add- some forests around the world have fairly strict rules on camp stoves and gel fuel is allowed Also a 100g gas canister will boil about 10l for $6 so may as well use that Quote Link to post Share on other sites
tortron 63,957 Posted June 5, 2020 Report Share Posted June 5, 2020 Those caldera shields above seem to do a good job though. 20% more efficient use of heat. Quote Link to post Share on other sites
Yowzer 33,818 Posted June 5, 2020 Report Share Posted June 5, 2020 How fast will a Mapp torch boil? 1 Quote Link to post Share on other sites
tortron 63,957 Posted June 5, 2020 Report Share Posted June 5, 2020 I'll test it tomorrow 2 Quote Link to post Share on other sites
Willdat? 4,278 Posted June 5, 2020 Report Share Posted June 5, 2020 15 hours ago, tortron said: Tried some other things. One was a tin can with steel wool in it and a bunch of holes. I managed to get the gel to roar in this set up, but boil time was still about 20mins, and it was hard to extinguish and carrying two things you may as well use an alcohol stove. Seems I got it right the first time, I tried a pot stand that sits on top of the tin, but it blocked too much air and increased boil time by 3-4 mins. Modified my original shield to support the mug better and put a few holes around the bottom. There's a few ways I could force feed it some air, but it's just extra complexity and weight for minimal gains, the tin itself doesn't promote it either. I have an idea about having 2 lids and some drilled tubing like a carb emulsion tube to get oxygen inside the can but eh maybe. As a comparison, an esbit tablet (solid hexamine fuel) boils 500ml in 8-9 minutes. It leaves some gack residue on the bottom of the pot though, however easy and reliable. I might see if I can find a clean burning firelighter for cheaper. Also it's faster if you break the tablet in half for more surface area The price is right on these cans, but in 20mins I can have cooked and eaten. Note to add- some forests around the world have fairly strict rules on camp stoves and gel fuel is allowed Also a 100g gas canister will boil about 10l for $6 so may as well use that https://www.gearshop.co.nz/products/jetboil-micromo-cooking-system?variant=29523955286114¤cy=NZD&utm_medium=product_sync&utm_source=google&utm_content=sag_organic&utm_campaign=sag_organic&gclid=CjwKCAjw2uf2BRBpEiwA31VZjxNWWOzPDchYBoT78rTMf3xuWrTjfx5RqIjrt58LbRz92Lf6rA69XRoCbc8QAvD_BwE I have one of these, 12L /100g and boils 500mL in 2 mins. I was super cynical until a guy next to me set up, cooked, ate and cleaned up before I'd even boiled with my meths burner. 2 Quote Link to post Share on other sites
tortron 63,957 Posted June 5, 2020 Report Share Posted June 5, 2020 Yeah I have one too I'm a camp stove barry 3 Quote Link to post Share on other sites
Popular Post SOHC 10,708 Posted June 10, 2020 Popular Post Report Share Posted June 10, 2020 Parts of this are made from the Mitsubishi colt rear seat I hacked out in a bad mood because I couldn’t find the bolts. 26 Quote Link to post Share on other sites
Popular Post tortron 63,957 Posted June 14, 2020 Popular Post Report Share Posted June 14, 2020 Wife sent me this picture a few days ago I told our neighbor you would make this for her. No, just buy one, it will be cheaper Apparently none available. So today they are getting this She wanted a removable shelf, so I went one better and made it adjustable 18 1 Quote Link to post Share on other sites
Rupertg 682 Posted June 14, 2020 Report Share Posted June 14, 2020 Is that barbed wire on your wall? I presume that is not the neighbour you are going to effort for. Quote Link to post Share on other sites
Popular Post tortron 63,957 Posted June 14, 2020 Popular Post Report Share Posted June 14, 2020 Just now, Rupertg said: Is that barbed wire on your wall? I presume that is not the neighbour you are going to effort for. I went to the NZ prison supplier and said give me something that's going to cause permanent disability to anyone who thinks.about going.over my fence 13 3 Quote Link to post Share on other sites
h4nd 6,714 Posted June 14, 2020 Author Report Share Posted June 14, 2020 On 06/06/2020 at 09:32, Willdat? said: https://www.gearshop.co.nz/products/jetboil-micromo-cooking-system?variant=29523955286114¤cy=NZD&utm_medium=product_sync&utm_source=google&utm_content=sag_organic&utm_campaign=sag_organic&gclid=CjwKCAjw2uf2BRBpEiwA31VZjxNWWOzPDchYBoT78rTMf3xuWrTjfx5RqIjrt58LbRz92Lf6rA69XRoCbc8QAvD_BwE I have one of these, 12L /100g and boils 500mL in 2 mins. I was super cynical until a guy next to me set up, cooked, ate and cleaned up before I'd even boiled with my meths burner. Cool. It looks like 80% of the benefit is using a heat-sink in the base in reverse to couple the flame heat into the liquid, and also insulating the sides. I wonder if it'd be worth passing the exhaust up the side a bit, too Or something like this: https://www.wired.com/2014/07/a-jet-engineer-designs-a-saucepan-that-heats-up-super-fast/ Maybe even with a shroud up around the gas to keep it in to the sides of the pot, during the windy. Step one, glue 486 heatsink to bottom of pot? 1 Quote Link to post Share on other sites
tortron 63,957 Posted June 14, 2020 Report Share Posted June 14, 2020 MSR make/made these copper heat exchangers The problem being it's actually quite a niche market. Most hikers won't hike long enough to get the fuel benefit of carrying it. Easier to carry an extra boils worth of fuel. Takes a while for the weight to pay itself off. Most useful when you are melting a shit tonne of snow for water, so the market is extended mountain climbing for groups 5 Quote Link to post Share on other sites
tortron 63,957 Posted June 15, 2020 Report Share Posted June 15, 2020 Further camp stove barrying Quote Link to post Share on other sites
h4nd 6,714 Posted June 15, 2020 Author Report Share Posted June 15, 2020 I paused your video as the siren was going off, and there was a siren in-sync in the background here. Aliens. Off topic. Not spam? 1 Quote Link to post Share on other sites
tortron 63,957 Posted June 15, 2020 Report Share Posted June 15, 2020 woop woop thats the sound of the police woop woop thats the sound of the beast 1 Quote Link to post Share on other sites
Lord Gruntfuttock 23,839 Posted June 15, 2020 Report Share Posted June 15, 2020 Why weren't you weighing in on the slipper chat in spam... Quote Link to post Share on other sites
h4nd 6,714 Posted June 15, 2020 Author Report Share Posted June 15, 2020 Back on topic, nerds I made a test jig out of bean tins, RC servos and spit. It worked great: 3 Quote Link to post Share on other sites
Popular Post MightyJoe 4,790 Posted June 28, 2020 Popular Post Report Share Posted June 28, 2020 I bought this and a trowel today for $3 . Didnt expect much but it had weight to it. An hr with some wet and dry and it turns out its got some age and was a good make in the good old days. 'Rabone no1905 8". ' 13 Quote Link to post Share on other sites
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.