Re: [PSUBS-MAILIST] Pod Vent Allignment

["Dan H." <Jumachine@comcast.net>]

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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