4 ms·
I think it's saying if the two panes were sealed without a hole at ambient pressure when the plane is manufactured then the outer pane at elevation would have ~
by mbrameld 11y ago
I think it's saying if the two panes were sealed without a hole at ambient pressure when the plane is manufactured then the outer pane at elevation would have ~1atm of pressure pushing out on it and the middle pane would have ~1atm pushing in on it. With the hole the outer pane only has cabin pressure pushing out on it, which is ~75% of 1atm.
- mturmon 11y agoYes. This whole exchange could have benefited from a simple diagram (numbers approximately correct for 35K feet): | | [cabin] | [gap] | [outside] 0.75atm | X atm | 0.23 atm | | If "what to make X" is your design choice, you would not want to have it always pegged at 1 atm, as it would be if it was/could be completely sealed at sea level. It's simplest to have it equalize with the cabin pressure.
- weinzierl 11y agoThe ASCII diagram is very helpful. I wish I had thought of including something like this in my original comment. Thanks a lot.