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What about divers/pilot entry and egress? could you
get out of the sub to explore hands on easily? maybe have a hatch underneath the
pilot? that way he or she could just open the hatch and drop out to explore
without having to open the sail hatch and loosing all the air?
Man you got my brain meats going on all the nifty
things I could do with a wet sub now.
George Slaterpryce
----- Original Message -----
Sent: Thursday, March 02, 2006 4:09
PM
Subject: Re: [PSUBS-MAILIST] Have you
ever heard of a Murisub?
I think we're singing off the same page here. The operator's
compartment would be essentially a diving bell. The ballast tanks would
be open at the bottom and water would be allowed to rise using the control
found in the Delta Wing semiwet. (Yes, I still have the magazine
featuring the sub from the '60's) I figured that I would need some kind
of escape system perhaps tied into the normal top entry-egress but with a blow
off system. Since we're ambient that would be no problem, but that
certainly validates your caution about using diving equipment.
Perhaps I'm overly optimistic about endurance times, though I suppose I
would depend upon how frisky I got with the throttle. Thanks for the
tips on the trickle charger, especially the part about the $20 solar
panel. I'll see if I can futz around on paint shop and maybe make a
drawing I can e-mail.
George Slaterpryce
<gslaterp@hotmail.com> wrote:
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
locomo! tion 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
v! ehicle 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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