[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
RE: [PSUBS-MAILIST] RE: MSV Alvin Jr. Update
Wow, what CAD work! Some ideas (sorry to be so brief, work is calling)
- The K boat MBTs IMO are a bit of a pain when it comes to the method
for joining pressure hull and tank (silicon sealant). In my experience
the seal has a tendency to develop small leaks, and is an absolute beast
to disassemble. It would be an improvement if you built tanks that were
self contained, without using the pressure hull as part of the tank.
- The MBTs burp with the surface movement of the boat. I see you've put
in little skirts. You may want to consider enclosed bottoms on the MBTs,
with openings piped lower, or on the centerline. The key would be to put
a large access pane on the bottom of the MBTs. I actually glassed in the
bottom of Snoopy's MBTs for this reason, though I ended up undoing the
job for easier maintenance access. But the "right" approach would have
been access panels under the tanks.
- I think you may want to make those saddle tanks slope up towards
whatever location you'll place the venting valves at (presumably the
center).
- If you go with that decklike fairing, why not just turn the whole
thing into tanks? You'd still want it divided up, but it would be less
work than tanks and fairing as separate items.
Thanks,
Alec
-----Original Message-----
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of irox
Sent: Wednesday, November 15, 2006 3:13 PM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] RE: MSV Alvin Jr. Update
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
>>
>>
>
>
>
>
>
>***********************************************************************
>*
>***********************************************************************
>*
>***********************************************************************
>* The personal submersibles mailing list complies with the US Federal
>CAN-SPAM Act of 2003. Your email address appears in our database
>because either you, or someone you know, requested you receive messages
>from our organization.
>
>If you want to be removed from this mailing list simply click on the
>link below or send a blank email message to:
> removeme-personal_submersibles@psubs.org
>
>Removal of your email address from this mailing list occurs by an
>automated process and should be complete within five minutes of our
>server receiving your request.
>
>PSUBS.ORG
>PO Box 311
>Weare, NH 03281
>603-529-1100
>***********************************************************************
>*
>***********************************************************************
>*
>***********************************************************************
>*
>
************************************************************************
************************************************************************
************************************************************************
The personal submersibles mailing list complies with the US Federal
CAN-SPAM Act of 2003. Your email address appears in our database
because either you, or someone you know, requested you receive messages
from our organization.
If you want to be removed from this mailing list simply click on the
link below or send a blank email message to:
removeme-personal_submersibles@psubs.org
Removal of your email address from this mailing list occurs by an
automated process and should be complete within five minutes of our
server receiving your request.
PSUBS.ORG
PO Box 311
Weare, NH 03281
603-529-1100
************************************************************************
************************************************************************
************************************************************************
The contents of this e-mail are intended for the named addressee only. It contains information that may be confidential. Unless you are the named addressee or an authorized designee, you may not copy or use it, or disclose it to anyone else. If you received it in error please notify us immediately and then destroy it.
************************************************************************
************************************************************************
************************************************************************
The personal submersibles mailing list complies with the US Federal
CAN-SPAM Act of 2003. Your email address appears in our database
because either you, or someone you know, requested you receive messages
from our organization.
If you want to be removed from this mailing list simply click on the
link below or send a blank email message to:
removeme-personal_submersibles@psubs.org
Removal of your email address from this mailing list occurs by an
automated process and should be complete within five minutes of
our server receiving your request.
PSUBS.ORG
PO Box 311
Weare, NH 03281
603-529-1100
************************************************************************
************************************************************************
************************************************************************