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

["Joseph Perkel" <joeperkel@hotmail.com>]

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 
> ½", 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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