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Ok, so this is basically an Aeropress optimized for the higher pressures required for espresso ? Sounds like the ideal piece of kit for a camping partner to carry :)
DarPhyve
211
Nov 27, 2017
EverythingIsBetterOutdoorsConsidering you need around 9 bar for espresso, this'll get you closer than an aeropress but no where near 9 bar.
DarPhyveIn the description it is stated that this achieves 9 bar of pressure.
DarPhyveYou obviously know waaay more about coffee than I do. You sound like the ideal hiking partner. You should get this and bring it on a trip with me ;)
Cromulent
298
Nov 27, 2017
kstokleyI can state I achieve the 8 limbs of Buddhist enlightenment. Doesn't make it true. Many of us are skeptical of espresso makers that cost less than $200 and can lifted by less than two people. Perhaps validation of claims would aid both Cafflano and Massdrop. So far google shows nothing but kickstarters for it; no independent tests. :)
DarPhyve
211
Nov 27, 2017
DarPhyveTo get 9 Bar or roughly 130 PSI, a person would have to stand on this thing. Pushing down with your hand you may get 2 Bar at most.
manezinho
131
Nov 27, 2017
DarPhyve
211
Nov 28, 2017
manezinhoIf those dimensions are accurate, I with draw my previous argument.
manezinho
131
Nov 28, 2017
DarPhyveIt's a pretty nifty design :)
DarkNalel
44
Nov 28, 2017
manezinhoThe pressure still doesn't increase. Force goes up as area goes up, but the water being forced through the coffee sees exactly the same pressure as what you put into pressing at the top.
That being said, this has those nice handles to squeeze at the end of the stroke, and being free standing instead of balanced on top of your cup lowers the center of gravity so reducing the likelihood of the tipping over/jacknife thing when pressing hard on the aeropress with all your weight.
DarkNalelSo any of you coffee geeks want to do a short overnight soon ? I need more people like y'all in my life. I use folgers singles. Yeah, folgers singles, sugar, fake creamer and lots of tears. I used to have a great little lexan press that would make the perfect single cup, but I lost it along with my good stove, so now I just cry into my cup and boil it up and add a bunch of teabags of coffee instead.
it's a sad little existance but it's mine.
DarkNalel
44
Nov 29, 2017
DarPhyveI'd say I get roughly 150 pounds downforce on my aeropress, essentially balancing all but 20 or 30 pounds of my weight on the plunger. The area of my 2 1/8 diameter circle mesh filter is ~3.5 in2.
P = F/A = (150 lb/in2)/(3.5 in2) = 43 psi = 3 bar We'll assume negligible pressure drop across the screen filter.
For the Cafflano the area on the filter side (shower screen) is ~2 in2 so P = (150 lb/in2)/(2 in2) = 75 psi = 5bar. Closer. But they are pressing through holes and they weren't pressing that hard. With the grid of holes in place of a screen filter, which there look to be ~170 of at lets say ~3/64. So the area of the hole is 0.00173 in2 times 170 holes = .2941 in2. That squeezing action looks nowhere close to 150lbs, I'd say it's closer to ~15 lbs, so P = F/A = (15 lb/in2)/(.2941 in2) = 51 psi = 3.5 bar
It might be possible to hit 9 bar, but you need to press at 38 lbs, which is pretty hard for just your fingertips. EDIT: Just tried it with a scale. 30 lbs is reasonably easy to reach (and re-watching they may indeed be hitting this with only that amount of force), I don't strain to hold it constant until ~ 50. If I also pressed the scale against a surface while still squeezing it I could easily reach 38 lbs. Seems that the 9 bar may be reasonably achieved!
hadaad
5
Nov 29, 2017
DarkNalelI just read a thing (http://www.topendsports.com/testing/tests/handgrip.htm) that talks about very poor grip strength topping out at 44 lbs. I'm not sure if this is a different measure than you're talking about, but it seems like 38 lbs would be reasonable for an adult to reach. Unless I'm reading it wrong.