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karen nakamura wrote:
>In order to get
>sufficient pressure, you have to close the mouthpiece vents, but this =
is
>much more difficult than it appears and it's hard to get enough =
coverage
>over the vents at the same time as applying just the right amount of
>pressure to the purge valve.
It's better (and easier) if you use a side exhaust reg, and with all
things it takes practice, after all EAR is a lot harder than it looks, =
but
its easier after you have been shown.
As for your condom experiment, try getting hold of a rescue =
mannequin
and use that, it will give you a much better comparison.
>Now imagine trying to do this at the same pace as you'd be giving =
rescue
>breaths. Try imagine doing this while towing someone in the water. It =
just
>isn't very practical either in or out of the water.
Now try giving EAR in a rough or choppy sea. Its not an ideal =
method,
but in the right situation it could save a persons life
>Conclusion: take a rescue/CPR/O2 course and stick to what you know.
I agree, for most divers that will suffice, but with a bit of =
guidance
and a LOT of practice, positive purging can also have its place
Grant
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<DIV>karen nakamura wrote:<BR><BR>>In order to
get<BR>>sufficient=20
pressure, you have to close the mouthpiece vents, but this =
is<BR>>much more=20
difficult than it appears and it's hard to get enough =
coverage<BR>>over the=20
vents at the same time as applying just the right amount =
of<BR>>pressure to=20
the purge valve.<BR><BR> It's better (and easier) if =
you use a=20
side exhaust reg, and with all<BR>things it takes practice, after all =
EAR is a=20
lot harder than it looks, but<BR>its easier after you have been=20
shown.<BR><BR> As for your condom experiment, try =
getting hold=20
of a rescue mannequin<BR>and use that, it will give you a much better=20
comparison.<BR><BR>>Now imagine trying to do this at the same pace as =
you'd=20
be giving rescue<BR>>breaths. Try imagine doing this while towing =
someone in=20
the water. It just<BR>>isn't very practical either in or out of the=20
water.<BR><BR> Now try giving EAR in a rough or choppy =
sea.=20
Its not an ideal method,<BR>but in the right situation it could save a =
persons=20
life<BR><BR>>Conclusion: take a rescue/CPR/O2 course and stick to =
what you=20
know.<BR><BR> I agree, for most divers that will =
suffice, but=20
with a bit of guidance<BR>and a LOT of practice, positive purging can =
also have=20
its place<BR><BR>Grant<BR></DIV></BODY></HTML>
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