RE: [PSUBS-MAILIST] Fluidic instruments and controls?

["Hugh Fulton" <hc.fulton@gmail.com>]

I was involved in some plastic moulders that used fluidic logic elements and
the air/gas has to be super clean and dry otherwise you get build-up on the
walls which gives all sorts of nasty surprises.
Oil free air is a must or a pure gas such as oxygen but they work on the
coanda effect. Air with oil in it results in hydrocarbon build up on the
walls. Also you need to have filters for "noise" Very cool little things but
a nightmare to fault-find.  Stick with electrics is my take.  Hugh


-----Original Message-----
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Marc de Piolenc
Sent: Wednesday, 9 June 2010 1:53 p.m.
To: Personal Submersibles
Subject: [PSUBS-MAILIST] Fluidic instruments and controls?

Just a quick impulse question.

I'm currently spending a pleasant few hours downloading from Jens's 
fileserver - what a treasure horde that is!

While thus blissfully occupied, it occurred to me to wonder whether 
anybody has investigated fluidics for submarines. I'm not talking about 
pneumatics and hydraulics, but rather instruments and controls that use 
fluid-dynamic phenomena. For an introduction, see:

http://en.wikipedia.org/wiki/Fluidics

Obviously the aim here is to keep electronics, with their 
water-sensitive components, to a minimum. Fluidics is roughly analogous 
to electronics in that there are both analog and digital 
implementations. Interest in this field recurs from time to time in 
connection with operation of devices that have to be stored over long 
periods before use, and in connection with high-radiation environments 
that can damage solid state electronic devices. NASA even devised an 
all-fluidic guidance system for a projected "lifeboat" for the space 
station, with a stored program that could control the entire re-entry 
process! The control system used oxygen flow from the life support 
reservoir.

Best,
Marc



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