Alan,
Glad to hear all that. Shame you weren’t at last
P-subs convention as you would understand what was done in the DW 2000.
If you have everything cylindrical etc as you say then why are
you not able to make it from metal. Nothing surely can be that complicated.
Is it a weight factor? It is just that fiberglass is not generally used
for subs.
Looking forward to seeing a concept. Chs Hugh
From:
owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Alan James
Sent: Monday, 31 May 2010 10:38 a.m.
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] through hull reinforcement
I
have motor controllers, valves, O2 & CO2 monitors, O2 regulator, pressure
gauge, compass,
etc
etc. What I haven't sorted is the through hulls as I'm not certain of the
hull thickness yet.
The
batteries are going either internal in a tubular section out the back of the
pod or
external
depending on what the engineer thinks, as this transition may be difficult in
fiberglass.
I
haven't designed the scrubber yet. I want to have two small scrubbers for the
reason you point
out,
that in a small space the margins for error with the life support system are
less. They have a
designated
space under my seat.
I
have concentrated on buying all the componentry so I can sit in my model with
everything in it & know
for
sure it's going to fit & I'm comfortable enough. If not just dig out some
more polystyrene.
Also
there is nothing in my hull design that's not cylindrical, conical or
spherical.
Re
the flotation; I'll be using inflatable pontoon type ballasts wich will enable
bigger ballasts without the
drag
under water. Additionally I'm looking at an acrylic sail like Emile has
that can pivot back through
180
degrees & sit behind the pod while submerged.
Lots
of work but I'm further on than I was 2 years ago.
-----
Original Message -----
Sent: Monday, May 31, 2010
9:27 AM
Subject: RE: [PSUBS-MAILIST]
through hull reinforcement
Alan,
I am not wanting to dampen your enthusiasm but I think you need
to design the scrubber, battery switches, VBT internal spare battery,
Coms, valves, motor controllers, etc and allow for your 72 hours
safety time and make mockups of those to put into your foam model. Cliff
Redus and Nuytco designs are as small as you can get them. Even with
fiberglass if you cant make them out of steel /alumiinium then the design will
have to be many times thicker. i.e. cylindrical / conical / spherical
designs are also going to be best for fiberglass as well. Too small a
personal space makes air control too sensitive. Have you considered all
this? Deepworker is about as space conscious as you can get. Try and talk
to Cliff. If the space is too small then you will end up having to add a
lot of floatation. Just my penny’s worth. Hugh
From:
owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Alan James
Sent: Monday, 31 May 2010 8:40 a.m.
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] through hull reinforcement
Brian,
the hull is similar to Graham Hawkes "Aviator" wich was made out of
cast aluminum.
I'm
trying to make this as small as possible so that I have the convenience of
launching it off
the
beach etc. The shape is too complex for me to make out of steel.
I'm
designing this using a simple pressure program & a large block of
polystyrene that I've carved out
to
fit me & the subs internal componentry. once finalized I can contour the
polystyrene exterior to within
.5"
of the interior & just fiberglass over the outside.
The
small dimentions make it more suitable for using fiberglass. Mostly I'll be
about .5" thick (apart from reinforcements)
&
this will give me a 1000 ft crush depth for an operating depth of about 250ft.
However this will be confirmed
once
my final design is analyzed. The composite engineering program will also come
up with a laminate lay up plan.
-----
Original Message -----
Sent: Monday, May 31, 2010
1:07 AM
Subject: RE: [PSUBS-MAILIST]
through hull reinforcement
Why are you making it out of fiberglass?
-----Original Message-----
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org]On Behalf Of Alan James
Sent: Sunday, May 30, 2010 1:00 AM
To: personal_submersibles@psubs.org
Subject: [PSUBS-MAILIST] through hull reinforcement
I
need to design the reinforcement of the area around my hatch seat.
I've
read that with through hulls a general rule is you replace as much material as
has been removed
My
sub is small & is being made of fiberglass. At this stage I'm just trying
to get in the ballpark with
my
design calculations, as I intend to take take my drawings to a composite
engineer & get them
analysed
& corrected where necessary.
Would
the reinforcement be better on the inside of the hull, the outside, or divided
evenly on both sides.???
P.S.
To European & South African psubbers. NewZealand hot favourites for the
world cup.
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