Re: [PSUBS-MAILIST] riding the bubble

[Gregory Cotton <gregc02@gmail.com>]

My old Polaris missile boat used two center hard tanks for the hover
system. You'd start with one full and one empty, the empty one was
vented inboard and the full one was pressurized over sea pressure.
You'd get trimmed up, slowing down while you did it and when you were
at all stop and hovering, the computer (1963 style) would either flood
or blow as needed. After a few cycles things would damp down an you'd
be hovering at missile firing depth. When the vented tank would get
near full, the system just switched tanks. After things settled down
it didn't take much to hold it in hover.



On Thu, Mar 3, 2011 at 12:08 PM, Emile van Essen <emile@airesearch.nl> wrote:
> Brian,
>
>
>
> We do it with the Eurosub on greater depths. The 90 litre hardtank is air
> operated like the K boats.
>
> If you want to blow a few kilo’s out of to HT., you first might have to fill
> it with a lot of your air (at 200 Metres, 80 litre x 20 Bar is 1600 Litre!)
>
> So riding the bubble is a simple and more efficient solution!
>
>
>
> On the other hand : when surfacing, we blow the MBT with the compressed air
> in the HT to save air.
>
>
>
> Emile
>
>
>
> ________________________________
>
> Van: owner-personal_submersibles@psubs.org
> [mailto:owner-personal_submersibles@psubs.org] Namens ojaivalleybeefarm
> @dslextreme.com
> Verzonden: donderdag 3 maart 2011 17:19
> Aan: personal_submersibles
> Onderwerp: [PSUBS-MAILIST] riding the bubble
>
>
>
> Hi All,
>
>               Does anyone have experience with trying to control a sub with
> primarily a soft ballast tank.  I know there is a point where the air
> becomes compressed to a point where one starts to lose buoyancy and then
> you're headed to the bottom but can it be controlled if you stay slightly
> positive and then use your trusters to keep you down?
>
>
>
> Brian
>
> ________________________________
>
> Geen virus gevonden in dit bericht.
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