Re: [PSUBS-MAILIST] concept sketch

["Sean T. Stevenson" <cast55@telus.net>]

Thanks for the comments.  Actually, I had planned, but not yet included 
in the drawing, an upper hatch in the lockout compartment for emergency 
escape / PTC or rescue vehicle mating.  Such a hatch is best positioned 
far from the sail and superstructure.  Similarly, there would be an 
emergency escape hatch in the machinery space at the aft end, only with 
no lock, so that hatch would be usable only for transfers, or for escape 
by scuttling the boat.  To use the upper hull as the lockout I would 
have to increase either the beam of the boat or the height to create 
enough space below the hatch to accomodate diver entry and exit, unless 
I just wanted a wet lockout.  The diameter of the lockout compartment 
needs to be large enough to accomodate the large size of the diver 
lockout hatch, and to be functional.  The sail hull as shown is too 
small to stand in.  It is definitely an idea worth putting some more 
thought into, though.  The ability to lock out divers when bottomed is a 
good idea, although with the upper hatch included, my design would work 
in a pinch by flooding the compartment.  Large space to blow dry again, 
though.

The suction problem in a soft bottom did cross my mind - the only 
solution I thought of was additional superstructure in the form of 
bottoming skids.  Air pressure blowing seems like unnecessarily 
complicating the problem, as well as being a waste of air.  Maybe an 
outrigger system would work?  Hydraulically operated legs that unfold 
from the outer hull?

As for saving money, the standard rule of overkill applies:  why build 
one when you can build two at twice the price?  Hey - that gives me an 
idea.  If I equip the boat with a mating skirt, any number of these 
"sister ships" could be connected together to form an underwater complex 
for specific mission requirements, or just for crews to have luch 
together. ;)

-Sean


Carsten Standfuss wrote:

> Hi Sean - great concept. 
>
> I would like to think about to change the position of the diver lookout
> chamber to the aft end of the sail pressire hull. On this position you
> can use it as emergency look out chamber even with the boat on the
> ground. With a additional top hatch maybe also as transit chamber for
> dsrv and other subs. 
>
> In the position as shown you have anchor the sub to take divers in and
> out - in the top positon  you can just rest the boat on the ground. 
>
> Maybe this boat needs a high pressure air blowing system below the keel.
> The keel area seems a realy big flat area - indicates a a heavy suction
> effekt to a soft ground. 
>
> Do you think we can safe some money if we build two units ? ;-)
>
> http://www.heiszwolf.com/subs/tonijn/Tonijn.html
> http://www.heiszwolf.com/subs/plans/plansdolfijn.jpg
>
> best regards Carsten
>  





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