The drop weights are designed to offset the weight of a flooded pod. They
will need to be in the same position relative to the pods as the drawing calls
for, no matter where they are on the fore and aft line. As to centering the
pods aft, have you done your weight and balance chart? That will give you all
the answers you need about negative payload issues and needs
to be done in any case to figure what goes where, and for your own peace of
mind. Figuring payload is relatively simple at this juncture, so now is the
time.
Hi
All
I am wanting to install my drop weight and battery thru hulls on
my K350 and as Dan has observed moving the pods aft will probably help with
the attitude problem.The question is does one also need to move the drop
weights aft ?
I was thinking after considering Dan's remarks on the
weight distribution maybe to place the drop weights and battery pods
centrally.
Can I place lead in the battery pods
?
All the best
Glen South Africa
----- Original
Message ----- From: "James Frankland" <
james@guernseysubmarine.com>
To:
<
personal_submersibles@psubs.org>
Sent:
Thursday, June 04, 2009 11:49 AM
Subject: Re: [PSUBS-MAILIST] Pod
Vent Allignment
Hello Dan.
Sorry for my
late reply to yours! I'm up to my neck in wretched work at the moment so i
havent been checking my mail and have not yet alligned the pods. Hoping to
complete this weekend.
I'm glad you couldnt find the exact
location of the pods either, i thought i was being stupid or missing
something.
Point taken with your sub being a little forward
heavy. I have a heavy steel weld in ring to add to the forward endcap that
will make up the dome asseumbly, but then the dome itself which will give me a
little extra bouyancy up front.
I think i'll move them back
"a bit", but not to much. Its a bit of a guessing
game.
Many thanks for your
advice.
Regards
James
-----
Original Message -----
From: Dan H. [
mailto:Jumachine@comcast.net]
To:
personal_submersibles@psubs.org Sent:
Sun, 31 May 2009 09:41:44 -0400
Subject: Re: [PSUBS-MAILIST] Pod Vent
Allignment
James,
Sorry for a late
reply. If you haven't already located your pods, maybe
this will be
of some use.
I remember have the same question when
building my sub. The location isn't
clearly indicated. If I remember
correctly, I located my battery pods by
scaling off the drawings. I
know it's now a safe thing to do, but I did
some calculations and it
looked about right.
Now that I'm using my sub, I can tell
you that I have about four hundred
pounds of ballast in the aft
section of the hull and about a hundred up
forward. When I take a
passenger and they lay on the deck looking forward,
I remove my
forward weights but it usually isn't enough to get level.
Depending
on the passenger weight, I could have a 5 to 7 degree forward
down
angle. Five degrees isn't that noticeable, and when scanning the
bottom,
it actually helps so no big deal.
If I
were to do it again, I think I would move the battery pods aft a
few
inches, as long as it didn't interfere with the hull frames and
you have
clearance for welding. That way maybe I could have a bit
more forward
movable ballast.
Hope this
helps,
Dan H.
----- Original Message ----- From: "James
Frankland" <
james@guernseysubmarine.com>
To:
<
personal_submersibles@psubs.org>
Sent:
Tuesday, May 26, 2009 7:14 AM
Subject: [PSUBS-MAILIST] Pod Vent
Allignment
Hi All.
Finally i am
assembling my battery pods. Can someone help me with
a
problem.
The plans show the position of the
vents on the pods themselves, but i cant
see where they go on the
hull, lengthways down the hull. Not
exactly
anyway.
Looks like the front vent ends up
between hull frames 1 and 2. but where
exactly? Smack in the middle?
That would be 7 inches from the front of the
uncapped hull
tube.
Or, does it line up so the uncapped pod lines up with
the uncapped hull?
Also, i am only putting in 1 vent at the
front. The other is replaced with
the electrical through hulls
(Alec's design). I have modified the spacing
of the through hulls so
they fall exactly between frames. easier to weld if
they are not to
close to the frames.
Do you understand what i mean? Picture
is here of them just placed into
position. The front vent is in the
correct place as per the plans and the
spacing would allow the vent
to to in the middle of frames 1 and 2, the
others fall in between the
other frames.
http://www.guernseysubmarine.com/index_files/Page20926.htm The
questions are:
1 Where exactly do the pods go in relation
to the hull.
2 Am i ok to change the spacing of the
vent\through hulls to allow them to
fall conveniently between
frames?
Thanks
James
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