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In a message dated 10/22/2009 8:17:29 P.M. Pacific Daylight Time,
cast55@telus.net writes:
The Sport Subs are continuous flow air systems, configured to flow at a Hi Sean, That's what I thought. An ambient sub's systems don't have to be
all that hi tech. With tanks filled at a scuba shop, let's use the
standard 100 cu. ft. scuba bottle as they are easy to lift and maneuver into
place.
Two of these bottles plumbed so a constant flow of fresh air is being
delivered to the cabin of the ambient and the excess is vented outside.
The pressure inside the sub must be just above ambient to keep it dry
inside.
Using standard dive tables, the operator of an ambient should have the same
"bottom time" as a scuba diver.
With two 100 cu. ft. tanks for breathing alone ( not counting ballast-blow
tanks ) the operator should be able to go to 50 ft. for 1-1/2 hours keeping a
reserve for a decompression stop on ascent.
Locally it costs $6 to fill a scuba tank. So $12 to breathe
underwater, ( plus filling the ballast blow tanks ) seems less expensive
than re-filling a scrubber system with sodasorb.
There would be no complicated mixing system, so just the monitoring system
for 02 and C02 is needed.
The gages on the tanks will tell the operator how much time he has left,
and the batteries are used for only the other systems like motors and/or
controls. No fans required as the fresh air would be directed at or near the
operators face.
Scuba tank air is very dry, so condensation is reduced, and moist air being
heavier than dry air would naturally make it congregate near the bottom of the
sub where the outside vent is. If the sub has a conning tower where the
operator's head is, and the fresh air is directed into the tower, it should be a
comfortable ride.
Frank D.
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