Re: <SPAM> Re: [PSUBS-MAILIST] Question about pressure compensation

[Erik Muller <emuller@naic.edu>]

Hi,
This information is a little interesting to me. I am planning to build the
hull of my ambient sub using fibreglass, simply because it is easier to
machine and fabricate. 
Obviously, the durability etc. of the wood very much depends on whad KIND
of wood it is. Marine ply is perhaps one of the most robust and
resilient... do you have any more detailed comments on the robustness of
wood, as a function of the wood type etc?

EM.


On Fri, 21 Jan 2005 RiskEverything21@aol.com wrote:

>  
> Hugo,
>  
> While steel is very strong, it is not at all stiff relative to it's weight.  
> Wood is actually 7 times stiffer than fiberglass, and 5x stiffer than kevlar,  
> with very high cycling rates. By applying kevlar to the outer surface any  
> impacts would be spread out over a larger surface. If carbon fiber were used on  
> the inner surface of a wooden hull, it would serve to strengthen the 
> structure  even more because the carbon is stiffer than wood. In the end, I think it  
> depends on the thickness of the structure and of course the composites used.  
> I'll have to run some destructive tests to see if any of this is really  
> feasible.
>  
> Risk
>  
> In a message dated 1/19/2005 7:56:45 A.M. Eastern Standard Time,  
> hmarrero@hboi.edu writes:
> 
> Hello all,
>  
> Just  more food for thought for those brave souls who want to build their own 
>  pressure hull with fiberglass and wood.
>  
> Have  you considered in your design the effects of submerged impact, or 
> impact on  the surface with another vessel (while you are inside)? 
>  
> just  wondering,
>  
> Hugo
> 
> 
> 
>  
> 




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