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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 probably 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 Little 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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