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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