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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