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 feasible?
Don't want to put you on the spot for a reply, but your thoughts on the subject would be appreciated.
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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