RE: [PSUBS-MAILIST] Storm and SUB

[MerlinSub@t-online.de]

"Jay K. Jeffries" <bottomgun@mindspring.com> schrieb:
> Carsten,
> 
> Thank you for your reply.  Review of sub strandings over the last 100 years
> reveal that immediate escape is the best option while the crewmember(s) are
> still fresh.  Stress, tiredness, cold, and CO2 build-up all contribute to a
> rapidly decreasing chance of a successful escape.  In addition, it seems
> when you have one accident others seem to cascade.  This is not just from my
> review of history, there are other papers that have come to the same
> conclusion.  You can always go back and get the sub later (as they did with
> the Alvin after she swamped on the surface).  Get out as soon as
> preparations are completed for everyone's escape.  Waiting leads to
> increased fatalities.  If room is available, survival suits will increase
> the viability of survival once surfaced and while awaiting pick-up from a
> boat.  In a larger submersible such as Eurosub, a jetsonable life raft would
> be very beneficial (just make sure it will float to the surface prior to
> inflation, no of more than one case where the raft sank to the bottom prior
> to inflating).
> 
>  
> 
> I really love Sgt. Pepper but the issue of freeboard on the surface makes
> entry and exit very difficult as you note.  From your recent account, I
> gather that you lifted the submersible back onto the trawler prior to
> exiting the sub.please confirm.

Yes that right - I go into the sub and back ONLY 
on the deck of the Trawler. 
  

> As to Sgt. Pepper vs. Nemo I don't really remember the size of Nemo but
> would guest that there is a significant difference in size between the two.
> Skin area and cross sectional area are major factors in frictional drag.if
> you double speed, drag increases 8 times.  As to size differences (don't
> have the rule of thumb right in front of me but believe it is), if you
> double the size of a vessel, the frictional drag increase by a factor of 4.
> Appendages do cause drag but at the nominal speeds that most PSUBS operate
> at, the drag is a small factor in the overall picture.  If you want to
> radically increase speed, then the hull needs to be VERY FAIRED.  The German
> Type XXI Electro Boat was a very good example (Walther's hydrogen peroxide
> powered sub even more so), this was a radical change in form from the
> earlier fleet type boats.

Thats right. Nemo is a double seater of 1,5 ts - Peppers has around 0,6 ts.. :-) 
 
> In Sgt. Pepper's case in the open sea, what happens if you can't mate back
> up with the surface support vessel?

We just discuss that after a night dive of one of our scuba divers. 
If the diver did manage back to the trawler - he is in really trouble and 
will died after some hours at roof and coold sea. 

On Peppers I can us the Gps to ride back to the meetingpoint, or use the radio 
to give the trawler the position. In the night I can additional use the three searchlights.
Outside flashlight is allways running on a regular base.  

If this is not working because everybody on the trawler is maybe sleeping or drunken..
 - I will do the same, sleep. Turning my body from prone position to sleep position 180 degrees. Switch scrubber fan offline and all other eletric and electronics to safe battery power and let just gps and radio on.
Connect the hose from the snorckel vale to my mouth and sleep until sombody in the radio weak me 
up.. The boat is so small that I can heat the cabin to 22 degress even in the north sea 
wearing a t-shirt, a hose and socks.. If it gets cold in theory I switch on the inside search light 
which give me some nearly 50 watts of heat. Should run about 24 hours at least.   
On daylight or even on night I can use the 360 turning videoskop to look for some 
friendly fishing vessel with a crane.. 

I think I have a much, much better position to survife some days in the boat than a diver in the water.. 

Ps. If the crane of the trawler is not working the trawler can be use as wave barrier 
and I can manage my way from the micro-sub to the inflatable boat. As long as I am 
in the hatch only a very little water can rush in ;-) We can tow the boats than home.  

For Euronaut I purchase exit-hoods from a US-nuke military surplus. 
A liferaft is a device I should think about it. 

Wish we can quick exhange pictures and drawings on psubs.. Moki-file-server is so slow. 

Best Regards Carsten
 
> R/J2 
> Respectfully,
> 
> Jay K. Jeffries
> 
> Andros Is., Bahamas
> 
>  
> 
> It is the mark of an educated mind to be able to entertain a thought without
> accepting it.
> 
>   - Aristotle
> 
>  
> 
>  
> 
>  
> 
>  
> 
> Hi Jay - that is a question raising my attention. On Peppers sub, Emile and
> I have the possibilty to release three screws on the front dome, relase the
> inside scuba gear from the dive system and the wall. Open the snorckel vale
> and flood the boat via a pipe from the snorckel breazing vale to the bottom
> of the pressure hull via a hose to make the pressure comensation to leave
> the boat. 
> 
>   
> 
> It the boat catch a net on a wreck - what will be the time to leave- After
> an half hour and all thrusters now hopeless in the net - the pilot fresh and
> clear ? Or after 8 hours - the Co2 monitor showing some alarm at 1-5 % Co2..
> ? I was under the impression that the latest point on day light will be the
> best so the guys on the surface can do some rescue operations... 
> 
>  
> 
> Item to be discuss..
> 
>  
> 
> Ps about drag.. If Nemo with his three motors and two sail is under full
> speed underwater - Peppers can turn cyles around this sub like a shark..
> with one Minkota 55 lbs. And in the afternoon when Nemo is on the pier and
> chargeing his batterys - Peppers switch on the light fo a late night dive -
> and that with the smaller battery.. 
> 
> But in my opinion a open sea psubs needs a sail - or a supply boat with a
> good working crane. 
> 
>  
> 
> best regrads Carsten
> 
>  
> 
>  
> 
> 





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