Concept : If you lower the internal pressure of the uw housing to less than 1 bar when you are at sea level you do not need latches as atmospheric preassure replaces them to mantain close the door of the housing. When summerged, this effect continues. To open the housing you should relieve internal pressure. Think about an airtight case in an airplane. You open it in the flight, you close it, you can not open it in land if you do not use the relief valve of the case.
Advantage : With homemade uw housings, it is good this kind of locking procedure because it does not work if housing has a leak. It checks itself as watertight BEFORE entering water. Just try to open it, if it open lock is wrong.
Design : There are a lot of forms to use that design. Some are better than others. I would like to know one good one. Easy to machine if possible. I have my own design, very easy and very effective, but out there are people with more experience and i would like to learn from them.
My idea is to use
(a) a valve and an external device (a bicicle pump like thing) to extract some air from housing.
(b) a kind of sringe in the inside of housing operated from outside by a bar that you can use to decrease internal pressure and lock in place securely to mantain that low pressure.
Do you know how works different tyoes of air locks?
Do you know how 10bar lock works in detail?
How much air do you extract from the housing using that kind of air locks?
Anything related to that will be of great help
I am sure somebody did it yet but google does not show it nor search here
Edited by fer_abella, 20 November 2009 - 04:36 AM.