The Willie of today is a constant mass flow SCR with
back mounted breathing bags. This is how the unit looks with the cover
on.
The over pressure dump valve, SI-teck dry suit valve, is seen to the
right.
A 5L 200 bar (i.e. 35 cubic feet for you imperial freaks) tank with a
Poseidon 1st stage feed the unit. The first stage is ambient referenced
thus allowing a slight increase in fresh gas flow with increased depth
but also makes it possible to use an ordinary 2nd stage as a bailout,
just like the Dräger Ray. The gas to
the wing and the dry suit is also feed from this the first stage |