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The design concept seems very feasable, although
3-4 hour endurance might be hard if you go the way of batteries as your primary
power source, as well as expensive to charge... although you could probably pick
up a couple of solar panels and make a solar array to trickle charge your
batteries when you weren't using your sub. (if you need schematics on how to
build a simple trickle charger let me know, between harbor freight 20 dollar
solar panels and some cheap ICs from radio shack you can build one for under a
hundred bucks easy, I can give you pictures/schematics of mine if you need
them)
Your dry operators compartment Is going to work
something like a diving bell yes? So you're not going to have to worry too much
about making a preasure can... you could probably just form plexiglass... but
I'm not sure... that's a life support system and I would suggest you talk to
someone who has a heck of a lot more experience with the life support part than
I do. but my guess is that a formed plexiglass dome that's constantly
supplied with air from a scuba tank would operate as a diving bell and would be
an ambient preasure diving bell... and half your body would sit above the water
line leaving just your head in the airtight area... I would have diving gear on
just in case though... these are just my thoughts... again talk to someone more
knowledgeable about life support than I, never take any chances with life
support systems. (you wouldn't buy a 50 dollar regulator off of ebay would you?
taking my lifesupport advice as that of a real professional vs a rank
amatuer would be about the same thing.)
Also, (again this is my inexperience talking but is
something I would be worried about) if your going to enclose the pilot, what
happens if something goes wrong? Say your ballast burst or some other thing
happens that takes you down too quickly or too far... You might want to think
about designing some sort of latch release system for your "sail".
Instead of a single viewport forward, why not also
consider forming plexiglass so you have a 360 degree view? As an ambient sub you
don't really have to worry about crush depth as much... you do have to make sure
all your seals are good and tight though, the water preasure won't hold any
hatches tight.
George Slaterpryce
----- Original Message -----
Sent: Thursday, March 02, 2006 3:06
PM
Subject: Re: [PSUBS-MAILIST] Have you
ever heard of a Murisub?
George,
Thanks for all your time and effort. Sorry, I didn't reply sooner,
was away from the 'puter a couple days. What I have in mind is an
ambient sub with a dry operator's compartment. To be honest I don't know
if something like the Delta semi wet could be adapted so that the ballast
tanks are pvc pipe controlled and the pilot sits in a compartment that is
separated from the fore and aft tanks by bulkheads that extend approx 75% of
the hull diameter. I envision all this in a package resembling a Soviet
Akula class sub, with the operator's head in the "sail" with a clear viewport
forward.
Obviously, we're talking 30-50 foot operating range and perhaps 3-4 hours
endurance.
It would pretty much be an observational/recreational sub.
Did my description make any sense? If I were more
computer literate I could perhaps e-mail a drawing. Anyway, does your
interpretation seem feasib! le? Don't want to put you on the spot for a
reply, but your thoughts on the subject would be appreciated.
Philip
It would use a PVC frame with a PVC Batter
compartment ! suspended below it in the middle using 4 marine batteries w/
hydrocaps connected to a speed control and then connected to two 12v
trolling motors. It would have four ballast/trim takes, two foreward and two
aft, the aft ones would be the larger of the four because of the weight
distribution. It would have a fiberglass rudder aft between the two trolling
motors that would be controlled by the rudder pedals and it would have two
fiberglass dive planes foreward controlled by the "joystick" dive plane
control. The diver and or pilot would sit in the reclined seat (probably a
refitted lawn char). Life support would be the standard scuba gear. The
battery compartment would serve as the keel for stability.
To go up the diver/pilot would incline the dive
planes, to go down decline them. left or right the diver would use the
rudder pedals. It would be powered descent and ascent only... I would
probabl! y ballast it slightly bouyant in case your batteries go out then it
would slowly rise to the surface on it's own.
Because of the trolling motors used for
locomotion it couldn't go down any more than 30' (trolling motors are only
rated for +1bar) but if you could get some other kind of motor on this you
could probably take it down to 60' and still keep the PVC construction...
any more than that and you'll need to replace the frame/ballast with
something sturdier. The fiberclass dive planes and rudder should be fine.
You cold probably strap an extra tank to this too to increase your bottom
time a bit. You could outsize your ballast and to keep things simple just
put a plug in each one and re-ballast every time you take it out by letting
water in by removing the plug and then plugging it back up when it's
ballasted correctly. Or you could use foam and lead weights.
If you built this however because of the
trolling motors and because it would carry a person it would still have to
be registered as a boat in the state of florida. (any powered marine vehicle
capable of carrying passangers) I don't know about your state.
And thus you have the cummulative results from
my 45 minute brainstorm spawned by this thread.
George Slaterpryce
----- Original Message -----
Sent: Tuesday, February 28, 2006 9:28
AM
Subject: Re: [PSUBS-MAILIST] Have you
ever heard of a Murisub?
What do you want to do with it? Diver
Delivery? Recovery? Sight Seeing? How deep do you want to go?
If you want to stay in <= 30' of water a
fiberglass formed hull, trolling motors and PVC Pipe based ballast would
be the cheapest way to go for an ambient wet sub. Now that I think fruther
you could even do your entire support structure with PVC pipe for ultimate
low cost construction, although it wouldn't be all that sturdy. at > 30
I wouldn't trust the trolling motors' shaft seals you'd have ! to either
take them apart and replace the seals with something better suited...
which would be difficult, so you might want to think about making a
preasure can that can hold your motor and then instead of a prop attache a
stuffing box to a shaft and then out to a prop.... and that should be good
to about 100' although you'll have to replace your PVC ballast system at
> 60' with either steel or aluminum cans.
It would be a really basic skid.... kind of
like an underwater go-cart, but you could probably build the whole thing
for under ~500.00USD (Assuming of course you already own the tools, such
as a mill, microlathe, pipe cutters...etc but to tool up to make the skid
I'd say it shouldn't be more than another ~500.00)
George Slaterpryce
----- Original Message -----
Sent: Tuesday, February 28, 2006
9:08 AM
Subject: Re: [PSUBS-MAILIST] Have
you ever heard of a Murisub?
Thanks, George.
The Aerojet subs in the pictures section are not the same as the
one I found in the book, but there is enough family resemblance to make
me think the author was wrong when he stated the operator was in a
water-tight compartment. He did say that the US Amphibious base at
Litt! le Creek was in Seattle and I know for a fact it is in
Virginia. It's probably a wet sub.
I did say I was looking for low tech (hopefully translating to low
cost) but I'd like something in a nice ambient dry or semi wet.
Thanks, again
Philip
George Slaterpryce
<gslaterp@hotmail.com> wrote:
George Slaterpryce
!
----- Original Message -----
Sent: Tuesday, February 28,
2006 8:35 AM
Subject: [PSUBS-MAILIST] Have
you ever heard of a Murisub?
Hello All,
I am a new member and am looking for info on a WW2 era 1-man
sub called the Murisub. Tried a couple search engines and
found nothing. I came across the boat in a book by Willy Brou
published in 1955. The cover illustration is a rendering of a
photo found in the illustrations within the book.
The caption states that the operator sits in a
water-tight compartment with a plexiglass hood wearing diving
eqpt. Which, indeed, the operator is wearing mask and
breathing eqpt. Painted on the side of the vehicle (I am
almost certain) are the words Aerojet General Corp. Tried a
search of Aerojet General but they had no historical archive
section.
It appears to be an interesting design and I am interested in
trying the low tech approach to a psub that would be found in the
earlier days of the art.
Any input would be appreciated.
Philip
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