[PSUBS-MAILIST] Bow tank with windows was Re: Nekton

[MerlinSub@t-online.de (Carsten Standfuß)]

Hi Karl, 
I know I have allready send you the drawing with the latest
concept of C.S.S.X P-00-1E3 or a variant from this generalplan. 

The bow tank has a bottom vale. You can blow him out by air,
than close the bottom vale and open again the top air vale to get
the small amout 0,2 bar overpressure out. 
There is a small access to the tank from the deck below
the pressure bottles 20 and 21. (The first two bottles in the
superstructure-deck.) You can remove the bolt and open it. 
Then put a ladder in and go in. Now you can clean  the
1,2 m dome in the front endcap and also the 3 tank windows in
the bow from inside. Also you can do painting or refit the
internal tin-anodes. Or you can do some work on the
videocameras, the lihghts or on the two hardregulator tanks 
or on the echosonder or.. It is not nessesary to put the 50 t sub out of 
the water. In an other design the hatch is just over the pressure
proof acrylic dome and you can go inside the tank from
the contol-room. All parts of the submarine are inspectable from the
inside (without the drop weight) - so it is not nessesary to put the 
sub out the water. 
The acess for the stern tank is from the machinery space. 

But normally I think you have only to flooded the tanks so that the 
windows get wet - than blow out - maybe this will help. If not
its seeems not a big match to put a freshwater line pipe with some
nozzel to the four windows - we have allready built this kind of piping
made from sainless steel to clean the outside windows of our oceangoing
badweather Search and Rescue cruiser. Woks very good and is simple.
This pipes get their water from the hot water tank - 
so it works also in winter time. If you want you 
can also give a small amout of cleaner into the water but than 
you can not use the tank from the bathroom and must juse a small
seperate tank. 

And Dave - in my opinon 6 ft is to small for a autonomus concept. You
need
6 ft for the man , 1 ft. for the frames, some space for the piping,
some for the batteries. Best start for design study will be thinking
about the underwater speed and range - that about the amout of batteries
or oxygen bottles. Then do some main frame cross section studys with you
your biggest friend and the batteries inside. And than you get an first
diameter.

I started the design with 6 ft. but by now
its have 2,5m diameter within 8,2 ft..

C.S.S.X is now 15,22 m x 2,5 m  ( 50 ft by 8,2 ft.)
Its displaced 48 t surfaced and about 60 ts dived. 
Dive deep will be 250 meter, test dive 310 meter
and destroy deep 500,023 meter. 

At the moment I working on both concept - Diesel-electric and 
close-cyle-diesel. Seems that the performance of the C.C.D is better
and the installation cost are cheaper, because you can start with only
some bottles in the superstructre-deck and if you what more underwater 
range you can added some more. And you have not to remove 5-5 ts of
batteries each 4-5 years..

But I think a nice size will be if you can put it inside a 40 ft
container to shiping it worldwide. If you want this the diameter
will be limited to about 7-8 ft, the length to 39 feet. 

Carsten

Karl & Shirin Fuller schrieb:
> 
> > Hi Karl,
> > I'm not sure I would build a big sub that way. If you haven't found of
> copy
> > of Jacque Piccard's book Sun Beneath The Sea, it is worth lookinging for.
> It
> > is about the Ben Franklin, built for Grumman in Switzerland. A 50-foot sub
> > that could support 6 people for 30 days without surfacing, the BF did all
> its
> > sea trials out of Palm Beach before the big drift mission that was
> eclipsed
> > (more is the pity) by the first lunar landing. I'd rather have been aboard
> > the sub, I think. Anyhow, lots of interesting stuff about viewport
> locations
> > and ballast tanks and the like and might give you some food for thought.
> > Vance
> Gidday Vance,
> Thanks for the reccomendation. Amazon is looking for a copy for me, sounds
> like a book well worth having.
> Actually, it was not a corrosion problem I was concerned with. It was the
> situation of, if you are looking 'through' the front ballast tank as with
> the Delta, with water rising and falling between dives, you could get a
> build up of salt and sea muck. On the surface, the chamber would be full of
> air so marine growth would not be a problem (a few days submerged might be
> different), a dive over the side nearly every day with a cloth should keep
> it clean. I bet you have thought about this Carsten ?
> >From down under,
> Karl.