or you could build around the engine when fabricating the sub, then
cut it out if you have to remove.
Brian
On Sun, Apr 17, 2011 at 1:37 AM, Emile van Essen wrote:
Lawrie,
Why use the K350 hull dim’s for a completely new sub? I think
fitting a Diesel in a 900 mm dia. Hull is difficult. Maybe better go
with 1 or 1,1 meter dia. Hull and 3/8” /10 mm shell
Mind that a flange brings a lot of extra cost/effort. I think that it
is not really necessary for outfitting a small sub with relative big
holes for the domes.
A 5 hp diesel can pass trough a 550 mm hole. Think I can fit a 150 Hp
diesel trough the 820 mm bowdomehatch of Eurosub..
Regards, Emile
-------------------------
VAN: owner-personal_submersibles@psubs.org [2]
[mailto:owner-personal_submers [3]ibles@psubs.org [4]] NAMENS
lawrie-psubs@environics.com.au [5]
VERZONDEN: vrijdag 15 april 2011 0:53
AAN: personal_submersibles@psubs.org [6]
ONDERWERP: [PSUBS-MAILIST] two questions, 1/8" or 1/2", and flange
between K350 pressure vessels?
Hi Alan,
Thanks for the link, will check out the doco. I have discovery
channel
and keep an eye out for that type of show. Very interesting to
learn
what is actually down there. Right title, aliens of the
deep. I like
the concept of an ROV tethered to a submarine. Sort of like
sending off
a blimp from the deck of a boat that hovers over to what ever your
interested in. Probably only need 60 foot of cable to do a nice
360
around the submarine before moving on to the next location.
The design allows enough room below the pressure vessels to
incorporate
an extendable boom, perhaps a forward cameria that can rotate
downwards
and to the sides. The boome could extend out forward 10 feet and
house
side scan sonar.
Originally I had two domes but I kept thinking about the amount of
freeboard and fingured it was nice to have an extra 12" to allow
for
water running over the deck due to a wave over the bow in a
moderate
sea. Not sure what sort of vision one gets from an acrylic
cylinder as
opposed to a dome. Always the trade off going one way or the
other.
Have two questions for anyone out there???
One I think it has come up a few times in the past. The drawings
I
have for the K350 indicates 1/8" (6.35mm) obviously more weight
using
1/2 and one would have to increase the wall thickness of the end
caps,
but does that really matter if the overall design of the boat
allows for
the variation in weight.
Second question, you have two pressure vessels (K350) in laterial
alignment joined by a passaway with an inside diameter of 550 mm at
15
mm thickness through the respective end caps... would it be best
to have
a mid way flange arrangement with gasket to join the two pressure
vessels i.e. bolted together, OR let the passway cyclinder join
them
directly i.e. no flange?
I see a lot of pressure vessels joined together around the oil
refinery
where I work and they op for a flange arrangement but I figured
this was
convenient for maintenance work. However, thinking about a 32
foot
boat, I wonder if the minute movements might create alot of stress
of
the welds and that perhaps a metal gasket of soften metal is also a
component that allows stress to be tranmitted to the flange gap.
Destressing would be a matter of occassional dismentalling the boat
and
replacing gaskets.
Unfortunately my engineering degree was environmental and I only
did
one year mechanical engineering and that was to build water
treatment
plants not submarines with joined K350 pressure vessels.
Anyone with some technical knowledge, very much appreciate your
opinions.
Back to the drawing board.
Cheers, Lawrie.
On Thu, 14 Apr 2011 21:10:50 +1200, "Alan James"
wrote:
Hi Lawrie,
I have just recently watched the DVD "Aliens of the deep" wich is
more a documentary than
a film. It has a ROV that's tethered to a submarine. Great watching
> for someone in to subs,
probably really boring for your average teenager. May give you some
ideas if you haven't
already seen it. I agree with Hugh re downward vision, but I guess
you could have a descent camera & screen
> as a substitute if you are set on doing away with the dome.
How come you have a dome hatch & an acrylic cylinder hatch. Why not
do two domes?
Regards Alan
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