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RE: [PSUBS-MAILIST] Reserve buoyancy

To: <personal_submersibles@psubs.org>
Subject: RE: [PSUBS-MAILIST] Reserve buoyancy
From: MerlinSub@t-online.de
Date: 06 Dec 2009 15:32 GMT
Reply-to: personal_submersibles@psubs.org
Sender: owner-personal_submersibles@psubs.org
Hi Vance, 

each motore eats 1,1 KW at 36,5 KG thrust. Full speed with 3,3 Kwh and 110 Kg Thrust.
Its overpowered and make a good surface speed of 3-4 knots.. 

On dive you normal run only one stern motor full or both side motors half speed. 
So medium it needs 1 kw per hour - but we not managed in a hole day diving to empty the battery. 

If you fill Rootssub with lithium cells you will have max about 64 kwh battery inside and a range of about 
70 sm at 4 knots at 100 sm at 3 knots..

If you build additional pods on this Lithium Rootssub you have also the need 
to extend the boat for a toilet room with shower..  

70sm/4 knts = 18 hours.. 

vbr Carsten 

"Emile van Essen" <emile@airesearch.nl> schrieb:
> Hi Vance,
> 
>  
> 
> Some pictures on a Croatian news page. You can see the axe bow of the
> capsized ship!
> 
> http://www.slobodnadalmacija.hr/Mozaik/tabid/80/articleType/ArticleView/arti
> cleId/81450/Default.aspx
> 
> can be translated by google.
> 
>  I have a lot of pic's  but I have to ask because its intellectual property.
> 
>  
> 
> The main reason for having battery's in a separate compatiment is safety.
> For the Eurosub we choose good quality AGM battery's which are unlikely to
> explode.
> 
> The 7,2 Kw/h proved enough for whole day diving. This was without long
> surface transit.
> 
>  
> 
> Emile
> 
>  
> 
>   _____  
> 
> Van: owner-personal_submersibles@psubs.org
> [mailto:owner-personal_submersibles@psubs.org] Namens vbra676539@aol.com
> Verzonden: zondag 6 december 2009 15:14
> Aan: personal_submersibles@psubs.org
> Onderwerp: Re: [PSUBS-MAILIST] Reserve buoyancy
> 
>  
> 
> Is the Garibaldi Expedition web page off line for more sub pics (I hope)?
> 
> -----Original Message-----
> From: vbra676539@aol.com
> To: personal_submersibles@psubs.org
> Sent: Sun, Dec 6, 2009 9:07 am
> Subject: Re: [PSUBS-MAILIST] Reserve buoyancy
> 
> Or a keel box or radially bisected pod open to the hull (sealed inside with
> a lid) like the old PC-5 or the Nekton series. That would provide a separate
> compartment for the batteries but do away with the leak problem completely.
> I don't have the engineering expertise to calculate such a thing, but ABS
> bought off on those boats, so one must assume that it can be done. PC-5 has
> a 20" tube section with one small hatch forward to pull batteries through
> (an enormous pain in the butt, according to the guys who worked on it). The
> nektons have an aluminum box top, o-ring sealed that screws down to the
> projecting edges of the steel box keel, which exposes the eight batteries
> from one end to the other (harder to build but easier to maintain).
> 
>  
> 
> What do you think, Carsten? A 1.2m X 30 cm X 30 cm box in the Eurosub? Or a
> 50 cm OD tube section? Now that KSS has been out to work, do you think it is
> necessary, or does she have enough power already?
> 
>  
> 
> Vance
> 
> -----Original Message-----
> From: MerlinSub@t-online.de
> To: personal_submersibles@psubs.org
> Sent: Sun, Dec 6, 2009 4:10 am
> Subject: Re: [PSUBS-MAILIST] Reserve buoyancy
> 
> Rootssub?
>  
> Make one central Pod under the pressure hull. 
> If it flood it increase the MG stability 
> and maybe partly compensate the FSEffect.. 
>  
> vbr Carsten 
>  
> <vbra676539@aol.com> schrieb:
> > 
> > Can't argue with that.
> > 
> > So, what do I call the first Eurosub built in the US? Immigrantsub?
> > 
> > Vance
> > 
> > 
> > 
> > -----Original Message-----
> > From: MerlinSub@t-online.de
> > To: personal_submersibles@psubs.org
> > Sent: Sat, Dec 5, 2009 5:52 pm
> > Subject: Re: [PSUBS-MAILIST] Reserve buoyancy
> > 
> > 
> > Boats designed without pods have not such problems.. ;-)
> > vbr carsten
> > 
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