[PSUBS-MAILIST] FW: Casper 2

Tue Jul 31 07:31:33 EDT 2018

Hi Alan 

The original pods are as per plan 57 -3/4" twelve inc sched pipe I have built mine six feet long and fourteen inches radius out of 1/4" steel plate my end caps are flat plate 1/2" thick  I carry three leisure batteries 18 kgs each plus I have added 150 lbs of lead to the out side of the cases .I made them longer to carry extra batteries for extra power.

Graham

From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of Alan via Personal_Submersibles
Sent: 31 July 2018 12:08
To: Personal Submersibles General Discussion
Subject: Re: [PSUBS-MAILIST] FW: Casper 2

Graham,

to do this accurately we would also need the dimensions of the

previous pod & it's battery weight to see what positive or negative

effect it was having. Ie. if it was 20lb negative then that is our

target with the new pod to get your sub back to neutral buoyancy.

Alan

Sent from my iPad

On 31/07/2018, at 10:14 PM, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Graham,

what is the wall thickness of the battery pods. Is the 14" the outside

diameter. Is the length you quoted to the ends of the end caps?

Are there reinforcing rings in the pods. If so what dimensions.

Also what is the weight of the batteries. You should be able to get

that spec off the internet.

I have the program " Under Pressure" that gives weights & buoyancy.

I would have to put hemispherical end caps in the equation as thats

it's limit.

You might get a better offer from someone with a better program but

I am sure I could get you in the ball park.

Cheers Alan

Sent from my iPad

On 31/07/2018, at 9:48 PM, graham bayliss via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Hi 

my name is Graham Bayliss I  have been building Casper 2 for many years and now find my self frustrated by science I have craned my sub into the water three time only to be frustrated by buoyancy problems I have redesigned my battery tubes to carry more batteries. this has meant they are very buoyant and being on the bottom my boat they tend to want to turn her on her side. My housings measure six feet long by fourteen inches I can not calculate how much weight I need to make these negative buoyancy I have three leisure batteries in each housing plus one hundred and fifty pound of lead on top. this does not counteract the upforce which each housing is subjecting my sub to. I am lost as to how I can over come my problem  as  she is determined to roll . can some one help me please.

regards 

Graham

Pictures  of Casper 2 being built are on the site if you need to look at what I have built.

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