[PSUBS-MAILIST] Question for the group

[Alan James]

Hi Graham,
I'm not quite following the idea, but Hydrospace have made submersibles with
inflatable ballast tanks. They used them on their spherical hull subs that open 
up like a clam shell. This was to give more freeboard. They did away with them
when they changed the entry at the top of the sphere.  
To comply to certification they needed 2 ballast bags on either side. The bags
are inside an open ended cylinder, so that when they collapse there is limited
drag when going through the water. There are a lot of ready made lift bags on the
net with over expansion valves in them.
Why not make the ballast tanks out of fiberglass if you are worried about corrosion,
or have a large inspection port in the bottom?
http://www.seamagine.com/OCEANPEARL2.html

Alan


________________________________
 From: Graham Bayliss <whitestar456 at manx.net>
To: 'Personal Submersibles General Discussion' <personal_submersibles at psubs.org> 
Sent: Sunday, April 13, 2014 5:30 AM
Subject: Re: [PSUBS-MAILIST] Question for the group
 

Hi  

Has anyone experimented with a different variable ballast tank I am thinking
of making a tube of gas pipe which is made of thick plastic inside I plan to
fit a bellows air bag, this will be blown up by the air line which blows the
water out of the steel ballast tank . One end of the tank will be fixed so
as to hold the bellows in place the other end of the tank will be drilled
with holes to allow the water to escape and the bellows to expand. The
pressure will blow the air out of the bellows when the return vale is
opened. This method also eliminates the fear of what the inside of the steel
ballast tank is doing due to sea water corrosion.  Has anyone any views as
to why this method will not work.

The builder of Casper 11

Graham Bayliss

-----Original Message-----
From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org]
On Behalf Of Jon Wallace
Sent: 11 April 2014 14:49
To: Personal Submersibles General Discussion
Subject: Re: [PSUBS-MAILIST] Question for the group


A club designed sub "OSS - Open Source Submarine" was attempted years 
ago.  It had a good start but stalled soon afterward.  That kind of 
project is difficult to complete unless someone with a clear vision and 
desire to lead the effort takes charge of it.  I don't think I have it 
linked from the main site anymore but the page still exists at 
www.psubs.org/oss if you want to look at it or revive it.

Franks saucer sub was taken over by his daughter.  Her intent was to 
finish it and she did write into PSUBS shortly after Frank's death 
notifying us of that intent, however I have never heard back from them 
again and don't know what ultimately became of the sub.



On 4/10/2014 4:18 AM, James Frankland wrote:
> Hi Scott\All
> I like the idea of the "club" manipulator.
>
> I think there is scope for several club type projects.  Just off the 
> top of my head.
> Club designed sub plans.  Perhaps based on the K250 or Emile's Eurosub 
> but kept super simple for the first time builder.
> Manipulator arm
> Re-designed hatch for K boats
> Single sideband UW radio
> O2 monitor
> I always thought it would be nice for someone or group to get hold of 
> Franks saucer sub and get it finished.  im sure he'd have liked to see 
> it in the water.
> Anyway, just thinking aloud,
> Kind Regards
> James
>

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