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

[Warren Greenway <opensourcesub@yahoo.com>]

Thanks for your input, Shin! OSS isn't all about
beginners, but we are trying to keep it within reach
of as many potential sub builders as possible...And
that means a large number of beginners (me included).
I showed my dad what we were working on, and he said:
"Heck, if that was a one seater, I'd build it!". Two
seats has be overwhelmingly requested, but we are
leaning toward the side of very comfortable one, tight
two. Thijs' pressure hull really would be simple to
build. Minimal welding, parts, and reinforcing pieces.

Warren.

--- Mad Pirate Shin <psub_only_temporary@hotmail.com>
wrote:
>   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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