Andrei Yashin from Moscow Russia sent me
some modifications he made on his Dräger Ray. Of special interest is the
orifice he made at home. If you are interested in how to calculate such
orifices please check out
Andrei has his own homepage here:
http://www.yashin.narod.ru/ . There is lot of interesting stuff there.
Andrei uses his modified Ray about 3 years now for depths up to 40 meters
and at water temperature from 0 to +30 C. For other Ray modifications check
out this page:
Andrei, thanks for your contribution!
White Sea Ice diving, Andrei Yashin on the
left diving his modified Ray.
I also added bubble-deflectors. They are
made of foam-rubber
The nozzle is redesigned by me to use EAN 40 at 8 l/min
(enough for me at all range of workloads).
Orifice diameter 0,3mm, supply pressure - 10,5 bar. On the picture left -
Dräger standard unit, on the right - self-made injector.
Pressure reducer made ambient-pressure
isolated (Fixed IP) using self-made nuts and high-pressure silicon compound
made by Loctite®)
Added ring-weights to compensate breathing
hoses buoyancy. Rings made of stainless steel with anti-glow cover
Here you see the rings mounted on the loop.
For cold-water diving added
thermal-protection cover for scrubber canister. 7-mm neoprene. It worked
well in water of about 0 C, at ice dives in the White Sea (Far North of