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James,
A clear forward MBT sounds real interesting.
Most of the time you'll be looking down but to have a totally unobstructed
forward view would be nice. You should be able to vacuum form something
from sheet material. It would take a big oven and a pretty elaborate
pattern to form into. It would probably just about disappear in the
water. Look into Lexan also. I've formed it in small molds
before and it works well. It's tougher and shouldn't be as prone to
cracking.
Forming big parts from plexi or Lexan probably
isn't easy but neither is making molds and laying up all that fiberglass.
Maybe Greg Cottrell can advise you.
Dan H.
----- Original Message -----
Sent: Monday, March 14, 2011 7:35
AM
Subject: Re: [PSUBS-MAILIST] Main Tanks
Question
Hi Dan\all,
I dont actually know what im going to do with the main tanks yet, so i
think i'll make them first and then fabricate the mounting arrangement
afterwards.
>I discussed my MBT alterations with Kittredge before I built
them. He cautioned me to be careful enclosing to much of the bottom so I
wouldn't find myself in a situation where the sub was nose or tail >up like
a buoy, with no way to vent the air from the upper MBT and no way to hold air
in the lower MBT.
Yes, i'd heard of that somewhere before, maybe from you. Makes
sense. I'll do the same as you with the vent holes.
What about this for an idea?
As you probably know, ive modified the front viewport to be a large
dome. I've been thinking of how i can make the main tanks as near to the
originals as possible but without losing visibility through my port. How
about getting the orward main tank fabricated completely from say about 1/2
inch clear acrylic and having a completely clear front main tank.
Protect the tank with some crash bars.
Otherwise glass fibre tanks with maybe some acrylic ports on similar to
Doug Privit's sub Delta.
Any thoughts on that anyone? Completely clear main tank made out of
acrylic. Sounds expensive.....
James
About 4400 pounds.
----- Original Message -----
Sent: Friday, March 11, 2011 11:07
PM
Subject: Re: [PSUBS-MAILIST] Main
Tanks Question
Off the subject, but how much do those K boats wiegh on land?
Brian
On Fri, Mar 11, 2011 at 9:22 AM, Land N Sea <landnsea1@hawaiiantel.net> wrote:
Hi James,
I am building a K-350 and have always admired
Dan H. beautiful job he did on his MBT,s. I was planning on glassing in
the bottoms of mine as well with a 6" opening in the centers or
one in the front and one in the rear of each one to prevent the "burping
action" when towed by a boat.
I see what you were saying about where the MBT,s
interface with the pressure hull as well as the problem with the strap
that holds them in place.
I have done some glass work in the past but
wasn't looking forward to this step in the future as I don't think I
have the talent to make the finish look as nice as Dan's but what the
heck.
I would love to see any/all pictures of your
MBT,s and any advice on how you formed them, got a fair front
curve on them etcetera.
Thanks
Rick Patton
Sent: Friday, March 11, 2011 5:51 AM
Subject: RE: [PSUBS-MAILIST] Main Tanks
Question
James,
I
have the standard tanks, but based on using them this is one area where
I would suggest you consider a significant departure from the plans, and
not just to make them look better. Specifically, I would close the
bottoms and provide downward stovepipes. But you will find that hard to
do with the standard method of attaching the tanks with a strap around
the hull (I actually glassed in the bottoms in an attempt, but ended up
undoing it). I would suggest giving the tanks three sides and a bottom,
as opposed to using the pressure hull as one of the sides, and bolting
them from underneath over supports that will need to be a little
different than the standard ones. Just something to think
about.
Thanks,
Alec
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Hi All.
Im finally at the stage where i am starting on my main tanks.
Ive decided just to stick with the ordinary ones shown on the plans, but
i'd like to jazz them up a bit like Dan H has done as i think they look
a lot better.
Question is: For those of you who have "modified" K350 main
tanks, did you make the framework as per the plans and adjust the tanks
to fit, or make the tanks first, and modify the framework to fit the new
shape. I suspect the latter. I was hoping to be able to get
the metalwork complete and then get the sub painted. If i have to
make the tanks first, it will mean more time unpainted. Anyway,
any thoughts suggestions always welcome.
Many thanks
James
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