[PSUBS-MAILIST] MSV Alvin Jr. Update

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

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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