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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