[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [PSUBS-MAILIST] Pod Vent Allignment



Hi Vance
Is there some tool or form that I am overlooking on the Pubs site for calculating the G and datum .Any input will be most welcome.
All the best
GlenSA
----- Original Message -----
Sent: Friday, September 25, 2009 12:45 PM
Subject: Re: [PSUBS-MAILIST] Pod Vent Allignment

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.
Vance


-----Original Message-----
From: glen brown <glenbrown@vodamail.co.za>
To: personal_submersibles@psubs.org
Sent: Fri, Sep 25, 2009 4:56 am
Subject: Re: [PSUBS-MAILIST] Pod Vent Allignment

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 
 
 
 
 
************************************************************************ 
************************************************************************ 
************************************************************************ 
The personal submersibles mailing list complies with the US Federal 
CAN-SPAM Act of 2003. Your email address appears in our database 
because either you, or someone you know, requested you receive messages 
from our organization. 
 
If you want to be removed from this mailing list simply click on the 
link below or send a blank email message to: 
removeme-personal_submersibles@psubs.org 
 
Removal of your email address from this mailing list occurs by an 
automated process and should be complete within five minutes of 
our server receiving your request. 
 
PSUBS.ORG 
PO Box 53 
Weare, NH 03281 
603-529-1100 
************************************************************************ 
************************************************************************ 
************************************************************************ 
 
 
-------------------------------------------------------------------------------- 
 
 
No virus found in this incoming message. 
Checked by AVG - www.avg.com 
Version: 8.0.339 / Virus Database: 270.12.52/2153 - Release Date: 06/03/09 18:00:00 
 
 
************************************************************************ 
************************************************************************ 
************************************************************************ 
The personal submersibles mailing list complies with the US Federal 
CAN-SPAM Act of 2003. Your email address appears in our database 
because either you, or someone you know, requested you receive messages 
from our organization. 
 
If you want to be removed from this mailing list simply click on the 
link below or send a blank email message to: 
  removeme-personal_submersibles@psubs.org 
 
Removal of your email address from this mailing list occurs by an 
automated process and should be complete within five minutes of 
our server receiving your request. 
 
PSUBS.ORG 
PO Box 53 
Weare, NH 03281 
603-529-1100 
************************************************************************ 
************************************************************************ 
************************************************************************ 
 



No virus found in this incoming message.
Checked by AVG - www.avg.com
Version: 8.5.409 / Virus Database: 270.13.112/2393 - Release Date: 09/24/09 18:00:00