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To those of you who use drysuits in water temps in the range of 50-55
degrees f, please, if you can tell me how much gas (Argon or Air) that
you use on dives as follows:
Terho> I use air in my dry suit. The air usage depends
mostly of what underwear you have and how much
air it can contain, not the dive profile. Air is
used during descend, so the depth defines
the needed amount of air. So, the square profile
takes least of air. If you properly
balance with right amount of air inside the
suit the air usage is not much. You can
calculate it in the same way you calculate
air consuption at depth for breathing. For
instance, if you have 4 litres of air in suit
and descend to 10 meters (30 ft) you must double
the amount of air to remain balanced, insert
other 4 litres. So, not much air is needed.
Just adjust the proper underwear and select the
weigths for that. (There should be no free air,
the clothing should absorb all air inside the
suit so that air cannot move freely when your
position changes). If the diver feels chilly, the
low temperature and body working against getting
colder increases air consuption also. This can
be seen from the log book if you update air
consuption in it.
I dive in Finland in cold waters, in the winter
under ice, etc. the seawater temperature was
12 C (53F) last Sunday, I would not call it cold
yet, only cool.
From Finnish waters,
Terho
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