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Re: [PSUBS-MAILIST] Dart 37 diesel electric concept drawings...

Hi Brian,

Thanks for the comments.

I live in Brisbane.

The domes are fixed, not intended to be an accessway.
The domes have a 3% tilted downwards forward for two reasons. To improve the forward view as you look very slightly down along the hull as opposed to straight forward, and I am also hoping that the first dome may amplify the bow wave effect. Won't know if the effect is achieved until I build a model and put it in fluid mechanics test tank. Basically a lap pool, long thin rope and pull it through the water at various speeds to see what happens.
The access way between the foward pods and the engine room is also the accessway to the deck when surfaced. The bounancy tank will have a inlet valve at the bottom and two hatchways above. One a storm hatch that pivots and shuts it struck by a wave placing more than 45 lbs of force on it or if closed manually. The storm hatch pivots just behind the mid-ship viewport. The storm hatch not meant to be completely water tight so that when shut it bad weather allows some air to pass between the hatch the deck surface from the stern. So water generally passes over the hatch but not into the accessway.
The secondard hatch is air tight and hinges from inside the bounancy tank upwards so it seals under the stormhatch opening. The principle is that the force of air is upwards and outwards against the hatch pressing it against the top of the bounancy tank inner surface. Secured by traditional means.
I also figure that in bad weather it would be good to be able to do everything you needed to do to isolate the snokel and make ready for submerging without getting wet.
Workin on some more detailed drawins for component parts and sections to illustate the concept better. 

Thanks for the feedback.

Cheers,

Lawrie.
On Fri, 3 Jun 2011 23:10:31 -0700, ojaivalleybeefarm @dslextreme.com wrote: 
Very creative, I like it !  especially the bubbles !  Lawrie, where
are you located?  why are the domes where the pilots look out sort of
cocked down a bit?
 
Brian

 On Fri, Jun 3, 2011 at 10:13 PM,  wrote:


GoodyaDay to all,

Like the idea of those light weight batteries.  Have you also
seen the development of flexible solar panels, some are so flexible
that you can wrap them around a mast.

The Dart project, heres the concept...

The mid-ship section has a large bounancy section that when
surfaced doubles as a accessway between the pilot/crew pods and the
aft engine room.

Have the new drawings on the home page www.psubs.engineer.net.au
[1]

I have desiged it in such a way that linkages between controls and
planes and rudder are mechanical.

Reasonable freeboard, may need some wave deflection foward of the
mid-ship viewport.  Perhaps something that can fold away when
submerged.

Also a snokel arrangement which is isolated from within the
mid-ship bounancy compartment.

For trim, two oil tanks fwd and aft with a 2-way pump.

Looking closely at the diesel/electic arrangement i.e. one diesel
and generator + compressor, two permanent magnet motors, and two
battery pods, one for each electric motor.

Drop weight, still working on two idea.  One drop a section of
the keel directly below CofG, or have two rails that all cannon
balls of steel roll out from the bow the stern.  Only problem with
the second option is if your in a nose down attitude when you need
to drop weight.  I figure that all the components that could
possibly result in a leak are astern to the midship pilot pod. Thus
a leak results in stern down.  Hope that makes sense.

Anyway comments and ideas always welcomed.

Cheers,

Lawrie.





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