Impressive!
Do you get the water hot enough at 18k?
The boiling point will drop substantially, relative to sea level.
Espresso requires pressure so water boils in enclosed volume at higher than air pressure. Data sheet for this is 9 bar iirc :) boiling point well over 100 C
Being a cappuccino drinker the next challenge is heating and frothing the milk:0
Caber:)
You don't use boiling water to make espresso. It is brewed at a temperature just below boiling temp. Too hot and the coffee will taste burned. To cold and the coffee will taste sour.
So far, the Handpresso works very well. Next thing I need is a stewardess making me the espresso :-) while I fly the plane.
That is great! Bit of a spillage risk but great nonetheless.
Interested in what the 12V battery power-pack looks like / consists of. Proprietor or home build?
Sure they must be 'dry' batteries, but 150W is a 'draw'. How many times can you 'brew' on a long flight.
It is a standard but rather heavy lead-acid 12V battery. I have no clue how many times I can brew the coffee, because I am not that addicted to coffee that I drink it more than once on a long flight. And in most cases I forget it.