>> I have heard of, and have recommended to others, using a scuba
>> air tank for this, with a very small window.
>    :
>>  It is also easy to test if you have a boat
>
>Why do you say that?  most scuba tanks are very close to
>neutrally boyant; they sink SLIGHTLY when full, and float
>SLIGHTLY when empty.  That's actually pretty ideal for your
>RV, but not so easy to dump off the side of a boat for
>testing.

That is with the regulator and stuff on. Without, they float, full or not,
afaik. (aluminium tanks anyway)

It never occured to me to just toss them overboard for testing. Normal
procedure is to tie them to the line using a web (?!) knot and a harness
above a bag of stones used as weight and winch them down in still water
with the boat still, and some sort of counter on the winch. Even if the
tanks would not float they would not sink on a line other than steel, and
it would not be taut w/o weight on the end. I am certainly no expert on
this, but this is how it's done by the book afaik.

Peter

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