Re: [PSUBS-MAILIST] RE: MSV Alvin Jr. Update

[irox <irox@ix.netcom.com>]

One thing (which you may have already addressed) is the extra gas you need
to carry to blow the larger soft tanks.  If I remember correctly, ABS says you
need to be able to clear your software tanks 3 (I'm not 100% sure it's '3')
times at max operating depth.

I realize that not everybody wants to follow ABS standards, but they do make a
good set of guide lines.   Also the K350 was designed with these type of safe
margins, and when up dating the design it seems a good idea to maintain them.

I like the pics, kind of reminds me of a k350 (re)design I was playing with a
while back.

Cheers,
 Ian.

-----Original Message-----
>From: Joseph Perkel <joeperkel@hotmail.com>
>Sent: Nov 15, 2006 1:44 PM
>To: personal_submersibles@psubs.org
>Subject: [PSUBS-MAILIST] RE: MSV Alvin Jr. Update
>
>
>I forgot to post the link itself.....    http://www.frappr.com/psub
>
>
>>From: "Joseph Perkel" <joeperkel@hotmail.com>
>>To: joeperkel@hotmail.com
>>Subject: MSV Alvin Jr. Update
>>Date: Wed, 15 Nov 2006 18:41:55 +0000
>>
>>I have posted some new views of the latest changes, to my version of the 
>>K-350, on my frappr.com/psub account. Some of this I did while having the 
>>flu, mainly the stern section which must be redone as a result, the 
>>fairings do not �fair� well at the juncture, and soft ballast under is not 
>>quite right.
>>
>>The intent here is to give this little guy massive amounts of buoyancy on 
>>the surface, so as not to swamp the hatch in 3' swells along the coastal 
>>littoral environment...... This is not proving to be an easy task. Seeing 
>>video of both Alec and Dan on the surface, confirms in my mind the 
>>necessity of this additional buoyancy for ocean use.
>>
>>As Vance pointed out, you give up one thing to gain another, very tough 
>>choices. Originally, the idea for these saddle tanks was to hopefully 
>>dispense entirely with all of the bow structures, ala PC-8, in order to 
>>gain forward line of site visibility from the sail. ...Well, that gives up 
>>too much available under waterline lift, without the use of massive 
>>saddles, which created more problems. Ah, and what to do about that massive 
>>space behind the aft viewport?...an emergency buoy on a reel perhaps?
>>
>>As it is, these volumes (saddle tanks) are 5 cf each for a total of 640 lbs 
>>reserve buoyancy. Note the shape in the forward view, that airspace is 
>>designed to resist (hopefully), the gunwales from being pushed under while 
>>rolling, this results from comments by both Jay and Vance. I cannot 
>>overstress my appreciation for comments and suggestions regarding 
>>improvements.
>>
>>Another consideration, and perhaps someone can qualify this or disprove it. 
>>I wondered that if I lost the forward MBT, would I ever be able to lift 
>>something substantial with the claw? Seems to me that forward MBT is a 
>>natural �lift bag�, should you just �happen� across a 50 lb clump of the 
>>Queens silver!
>>
>>Note the scale figures in position. These are based on my height of 5' 11 
>>�", and boy...is it tight in there! Eventually, I will scale this to a 42" 
>>hull diameter and recalculate displacements and weights out of curiosity.
>>
>>I�m astounded by the amount of detail work that will be required by the 
>>time a concept is finally  hashed out. Each component will need detail 
>>drawings of it�s own, including attach points and hardware.
>>
>>As always, I welcome comments for improvements / oversights.
>>
>>Joe
>>
>>
>
>
>
>
>
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