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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