[PSUBS-MAILIST] Vessel Registration

[Marc de Piolenc via Personal_Submersibles]

On 10/12/2024 10:59 AM, Alan James via Personal_Submersibles wrote:
> Hi Mark,
> I posted on Psubs Facebook page.
> Are you still on Mindinau Island?
No, I moved to Negros in 2016.
> The idea is to come to the surface with thrusters & draw air in 
> through a snorkel.
No reason that shouldn't work.
> 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.
> Have a back up air tank for emergency air & blowing of ballast tanks.
> A lot more convenient, & less expensive.
> 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.
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.
> One of the problems I can see is buying an appropriate fan blade.
> Perhaps a blade off a high powered vacuum cleaner & matching it with a 
> DC motor.

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...

Marc

>
>
>
> Yahoo Mail: Search, organise, conquer 
> <https://mail.onelink.me/107872968?pid=NativePlacement&c=Global_Acquisition_YMktg_315_EmailSignatureGrowth_YahooMail:Search,Organize,Conquer&af_sub1=Acquisition&af_sub2=Global_YMktg&af_sub3=&af_sub4=100000945&af_sub5=OrganizeConquer__Static_>
>
>     On Sat, 12 Oct 2024 at 3:40 pm, Marc de Piolenc via
>     Personal_Submersibles
>     <personal_submersibles at psubs.org> wrote:
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