Re: [PSUBS-MAILIST] Battery pod. (question for Dan H.)

[Ian Roxborough <irox@ix.netcom.com>]

Hi Akins,

hopefully your sub would not have deal with something as hard as a
hammer hit during submerged operations, and I'm sure it's a lot
easier to exit a wet sub if needed compared to a 1ATM sub.  But
during the launch and recovery phases of the submarines operation
it will be a lot easier to generate the types of forces need to 
crack the PVC.  Might be something worth considering during the
trailering process design.  Or maybe you could use either GRP
farings to protect them or cover the cylinders in a layer of GRP.

Ian.

On Wed, 19 Jan 2005 01:05:20 -0500
"Akins" <lakins1@tampabay.rr.com> wrote:

> Dear Ian.
> 
> The 12 inch diameter pvc pipe I am using for my battery pod is approx 3/8th's of an inch thick. It is very strong, somewhat heavy and made
> much stronger once the permanent end cap and female threaded fitting are glued in place giving it support on both ends. 
> Also being a pipe it is curved and will withstand more external stress than a flat surface. Perhaps if you hit it with a 
> sledgehammer with a long swing and all your might it might crack but although I have never tried that, (12 inch pipe is expensive!) I'm thinking you would
> have to hit it multiple times to crack or bust it, this is thick and strong material. My wetsub itself is fiberglass and nowhere near
> as thick or as strong as this pvc is, so my battery pod will actually be stronger than the body of my wetsub itself.
> Hopefully being a wetsub and having excellent visibility I will not crash into anything with sufficient force to crack the pod.
> I think it would probably take more force than my 74 lb thrust minnkota motor could put out to bust my pvc pipe even if I purposely ran it into something. 
> In the unlikely event that it develops a leak or were to somehow become compromised and fill with water my battery pod will be able to be jettisoned in case of 
> an emergency so I think it is an appropiate battery pod material for a two man 12 foot long wetsub especially since I will never take my wetsub below 100 feet. 
> 
>   
>   ----- Original Message ----- 
>   From: Ian Roxborough 
>   To: personal_submersibles@psubs.org 
>   Sent: Wednesday, January 19, 2005 9:26 PM
>   Subject: Re: [PSUBS-MAILIST] Battery pod. (question for Dan H.)
> 
> 
> 
>   What happens to PVC when you hit it hard with hammer?
> 
>   If it's the same stuff I'm thinking of, it will crack.
> 
>   Ian.
> 
> 
> 
> 
> 
> 
> 
> 


-- 



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