Re: [PSUBS-MAILIST] Hull failure calculation sheet

[Warren Greenway <opensourcesub@yahoo.com>]

No they are not. Sewer pipe is made of the lowest
grade
steel available. It will often have inclusions and
inconsistent thickness as well.

Warren.

--- Bob Duncan <katsurencho@yahoo.com> wrote:
> A major issue in Marine quality materials is   
> uniformity in strength.   Is one section of the
> sewer pipe as strong as another. Is the wall
> thickness consistent? Is the density of the steel
> consistent?
> 
> dinosnider666@spacemail.com wrote:
> > Do you get an certificates, or guarantees with
> your sewer pipe?
> > I.e., that it's made from such'n'such quality
> steel and inpected
> > for defects. At least you are getting it new,
> rather than used,
> > hopefully it will be less abused...
> > 
> > > I didn't know anything about batteries til a
> month ago. Me 'n Ryan have figured out how to roll
> our own that match top-end batteries. Sure, we'll
> screw it up the first few times. But once prototype
> works, we'll scale up and put the labour in. There
> are part-marks for tenacity.
> > 
> ---
> haha. Back to the 'I'm SO broke' part. Will be used.
> But like really matters if pick test depth, drop it
> down unmanned, and never ever go near that depth
> again - and periodically test. 
> 
> The optima spiralcells have cylindrical
> cross-section. Precisely my thinking also. 
> --
> try a search under 'battery design' and software.
> saw some nice stuff on wetcell and dryair designs.
> Nice -better than nothing - 'in case of emergency
> break glass' - throw in water, or puncture seal and
> vacuum etc. 
> anybody know how to reprogram a scuba dive computer
> for sub?
> D
> 
> 
> Two guiding principles govern Israel Naval Commando
> doctrine:
> 
> 1.Every defense system is vulnerable.
> 
> 2.The enemy can deal with weapons and operational
> methods that are known; for that reason, naval
> commandos use imagination, daring and initiative, to
> create situations which cannot be anticipated.
> 
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