[PSUBS-MAILIST] concept sketch

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

As a result of Carsten's suggestion I updated the design by adding a 
fourth hull underneath the two main pressure hulls.  Originally, I did 
this in an attempt to increase the vessels's draught enough to permit 
the egress of divers from the lockout chamber exit hatch without 
changing the hatch position.  I don't think I accomplished this 
successfully, since the space beneath the hatch is still insufficient 
for a person to stand when the boat is on the bottom; however, the 
design change added a couple of benefits that have nothing to do with 
lockout operation.

Since the propulsion is diesel-electric, the engine need not be located 
in proximity to the prop shaft(s), and in fact it is desireable to put 
it in a lower position, since it is a heavy piece of gear and will help 
to lower CG.  By putting the engine / generator down below, I get this 
benefit, plus the added benefit of lower noise levels in the main 
pressure hulls above.  The increased draught allows me to extend the 
mast well deeper, increasing my maximum "periscope" depth, and allows me 
to drain the bilges into the lower space for overboard pumping, reducing 
the free surface effect of any water in the bottom of the main pressure 
hulls.

I added the bow doors to this drawing, which are rotated into the closed 
position for cruising or surface runnng, to improve the hull lines and 
protect these viewports.  I also added props, for no reason other than 
to make it look cool.

www.seanstevenson.ca

-Sean





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