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 :)
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 ;)
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. :)
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.
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!
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.
https://ksr-ugc.imgix.net/assets/016/880/505/8518683b7729a7a033cc7e78a75f9dfd_original.gif?w=680&fit=max&v=1496150430&auto=format&gif-q=50&q=92&s=7af7503d0d857055f348f4a0548654ec
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.
it's a sad little existance but it's mine.
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!