Re: [PSUBS-MAILIST] newbie questions

["kory mosteller" <hardcoremosteller@hotmail.com>]

Thanks for the input.  the design i'm currently working on began when i 
first read Frank Busbys book cover to cover for the first time somewhere 
around the age 15.  essestially, it consists of the main pressure hull being 
3ft in diam. and 10ft in length, with 2 viewing towers stuck on top apx. 2 
1/2 ft in diam. and 2 ft. tall.  most of this is contained in an outer hull 
5 ft. in diam. tapering at both ends into an Albacore shaped hull.  between 
the inner pressure hull and the streamlined outer hull will be the HPA tanks 
(planning on 4 large HP tanks, one of which being its own independent 
reserve system) o2 tank to bleed in, 2 2ft diam. trim ballast spheres(fore 
and aft, being apx. +/- 250lbs apeice to compensate for the diff. between 
fresh or salt water dives as well as usual trim) 2 10ft batteries tubes 
located at the keel, with a mech. droppable emergency lead ballast weight 
between them  (which should also help keep a very low center of gravity for 
stability) as well as the fore and aft main ballast tanks.
the overall length of the boat is apx. 25ft, and would like it to be 
deisel/elec. as to not require much surface support (or at least be able to 
use just about any vessel for surface support without loading compressors, 
batt. chargers, etc on whatever vessel we happen to be using)
at any rate, thats the rough idea without writing a novel for everyone to 
read.  any thoughts, ideas, questions, or suggestions would be greatly 
appreciated by anyone out there, either here or offlist.

-kory








> From: ShellyDalg@aol.com
> Reply-To: personal_submersibles@psubs.org
> To: personal_submersibles@psubs.org
> Subject: Re: [PSUBS-MAILIST] newbie questions
> Date: Thu, 14 Sep 2006 23:13:33 EDT
>
> Hi Cory and welcome aboard! I'm fairly new to the group also but have
> received lots of good ideas and support. I have just started building mine 
> so  I'll
> be interested in the responses you get. Lots of good info in this group.
> Several of the members have lots of experience, and also have their own  
> subs.
> As to your questions, I'm no expert, but the subs I've seen have 4 or eight
> batteries. The voltage of the motors and how long you plan to stay down
> determines how many. Typically a psub has a separate battery for 
> electronics,  etc.
> As for air, you need bottled air for blowing ballast, and reserve air if  
> you
> get stuck, as a minimum. Remember that blowing ballast requires more air
> than just the cubic feet in the tanks. When you are at depth, the air in 
> the
> ballast tanks is at the same pressure as the surrounding water, and a cubic 
> foot
> of air at the surface is MUCH smaller when you blow it into a ballast tank.
> Some  guys use scuba tanks and others use larger tanks like the oxygen 
> tanks
> used in  flame cutting. An oxygen tank is also a good thing to have if you 
> plan
> to stay  down longer than an hour. You won't need a big tank for that as 
> you
> probably  will bleed it into the sub slowly while a CO2 scrubber removes 
> the
> "bad air  "
> You will also need to monitor cabin pressure and have some means of venting
> the sub's extra air when you add any to the cabin. Otherwise you might blow
> the  windows out when you get near the surface. Sounds scary but it's not 
> too
> complicated.
> Several monitors are needed like oxygen content and CO2, and several  subs
> monitor water temp, depth, direction, power usage, reserve power and air  
> etc. (
> lots of dials ! )
> One big thing is redundancy. If a system fails and you don't have a back-up
> system, you could be in big trouble.
> My thought in this adventure is to keep it simple, have back-up for the  
> more
> important systems, and never go in water deeper than you can swim to the
> surface in.
> If you can, go see some of the subs and talk to the guys. There's a lot to
> be learned and everyone I've met is very helpful. Good luck in your project 
> and
>  remember to HAVE FUN !
> Frank D. (408)353-6645    Santa Cruz,  CA





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