Re: [PSUBS-MAILIST] OSS Pressure Hull, DoubleEndcap

["Mad Pirate Shin" <psub_only_temporary@hotmail.com>]

  If the OSS is meant to be a "beginner's" sub, then I think reducing the 
amount of metal wrestling(such as banging in support rings) should be the 
number one priority.  If it meant construction would be easier or require 
fewer expletives, then I(as a beginner) would have no problem spending more 
money on a thicker hull or building a hull that is less comfortable.
  My first impression upon seeing a K-250 in person was that I could 
actually hug the thing.  Now I'm not trying to get scientific here, but just 
the thought that I could lock this thing into a bear-hug makes it SEEM 100% 
more buildable.  As Carsten said, the only real problem one faces when 
building a submersible is getting started, therefore I think the first OSS 
needs to seem as well as be simple and easy to build.
  Because restraining the size and complexity in a beginner's project is so 
important psychologically, I believe that the first OSS should be a single 
seater.  The vertical double-endcap with conning-tower hull design seems to 
be the best bet.  It offers a lot of room for little displacement, making it 
an over-all small/lightweight sub.  While a small sub is not good for 
working in, its small size and low weight offers a lot of freedom in 
choosing a tender boat for recreational purposes.  Even though a two person 
sub gives more fun per dollar, I choose my first submersible to be an easily 
built single seater rather than a do-everything sub that I never get around 
to building.

                  Regards,
                  Shin





Warren, I look forward to seeing the FEA report on Thijs' hull.

Alec, did you ask around about how fast Solo's hull can safely submerge and 
surface?  The research submersibles one sees on the National Geographic TV 
Channel spend a lot of time just getting to the bottom.  I was wondering if 
the flying subs would get a major advantage in bottom time due to a fast 
trip down(less air burned on the trip, so more air to burn on the bottom).




"And further more, be advised that although this is actually a live 
broadcast and is being sent out at this very moment, it is quite possible 
that it may arrive tomorrow, right now, or perhaps even yesterday." -Serial 
Experiments Lain ep#8








----Original Message Follows----
From: Warren Greenway <opensourcesub@yahoo.com>
Subject: [PSUBS-MAILIST] OSS Pressure Hull, DoubleEndcap
Date: Mon, 17 Mar 2003 18:28:49 -0800 (PST)

Thijs, I finally got your hull imported. I am afraid
that
I can't edit the model, just view it. I will have to
rebuild the model to run FEA on it. No biggie.
However,
I am looking at that hull, and it's really growing on
me. I have gotten a professional engineering opinion
of
the hull design, with our application being taken into
account; it recieved high marks. The only potential
issue
was stability. Any input on this? A small keel would
be
good, and could act as a drop weight. What about a
short
tail structure? I am also trying to work out how much
battery capacity we could store inside the hull, since
this design doesn't lend itself to external battery
pods
cleanly. I would like any additional ideas and/or
input
concerning the Thijs pressure hull. I'll post an FEA
report when I have finished.

Warren.


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