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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