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<div class="moz-cite-prefix">On 10/12/2024 10:59 AM, Alan James via
Personal_Submersibles wrote:<br>
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cite="mid:1869620936.991341.1728701950895@mail.yahoo.com">
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Hi Mark,
<div>I posted on Psubs Facebook page.</div>
<div>Are you still on Mindinau Island?<br>
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No, I moved to Negros in 2016.<br>
<blockquote type="cite"
cite="mid:1869620936.991341.1728701950895@mail.yahoo.com">
<div>
<div>The idea is to come to the surface with thrusters &
draw air in through a snorkel.</div>
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No reason that shouldn't work.<br>
<blockquote type="cite"
cite="mid:1869620936.991341.1728701950895@mail.yahoo.com">
<div>
<div>The thought is that you could replace 2 scuba tanks with a
blower & save on space as well as having a lot more dives
before needing to charge batteries, as apposed to filling
tanks.</div>
<div>Have a back up air tank for emergency air & blowing of
ballast tanks.</div>
<div>A lot more convenient, & less expensive. </div>
<div>What I am trying to figure out is what is the best type of
fan to use. A conventional fan or the squirrel cage type. Also
what speed and hp I would need to aim at.</div>
</div>
</blockquote>
Fan manufacturers publish detailed specifications. You can work out
the static pressure you need to overcome pressure at whatever depth
the sub will be at when you start blowing. Once you choose the flow
rate you want to blow mains before you get old, you will know the
power required.<br>
<blockquote type="cite"
cite="mid:1869620936.991341.1728701950895@mail.yahoo.com">
<div>
<div>One of the problems I can see is buying an appropriate fan
blade.</div>
<div>Perhaps a blade off a high powered vacuum cleaner &
matching it with a DC motor.</div>
</div>
</blockquote>
<p>Oh. No specs from a vacuum cleaner manufacturer, so an experiment
is required. Simplest is to blow into a pipe that extends down
into water to the depth you need, and see if you get bubbles. That
tells you if there is enough static pressure. I'm not sure how to
measure delivery under those conditions...</p>
<p>Marc<br>
</p>
<blockquote type="cite"
cite="mid:1869620936.991341.1728701950895@mail.yahoo.com">
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<div>On Sat, 12 Oct 2024 at 3:40 pm, Marc de Piolenc via
Personal_Submersibles</div>
<div><a class="moz-txt-link-rfc2396E" href="mailto:personal_submersibles@psubs.org"><personal_submersibles@psubs.org></a> wrote:</div>
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<pre wrap="" class="moz-quote-pre">_______________________________________________
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<pre class="moz-signature" cols="72">--
Archivale catalog: <a class="moz-txt-link-freetext" href="http://www.archivale.com">http://www.archivale.com</a>
Mass Flow (ducted fans): <a class="moz-txt-link-freetext" href="http://massflow.archivale.com">http://massflow.archivale.com</a>
ProZ profile: <a class="moz-txt-link-freetext" href="https://www.proz.com/profile/639380">https://www.proz.com/profile/639380</a>
Substack account: <a class="moz-txt-link-freetext" href="https://fmarcdepiolenc.substack.com">https://fmarcdepiolenc.substack.com</a>
Pinterest: <a class="moz-txt-link-freetext" href="https://www.pinterest.ph/piolenc">https://www.pinterest.ph/piolenc</a></pre>
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