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RE: Howdy

Yes, adding pressure to the inside will increase the depth you can safely take your sub to (with regard to hull strength only).  The hull sees a differential pressure only, increase the inside the equivalent of 30' of seawater and it will go 30' deeper safely, BUT! you will be seeing the increase as well and will have to account for decompression if you pressurize to more than 33' internally, the same as the dive tables!  The increase is NOT! a ratio change though, it is only a linear function.  Twice the internal pressure does NOT give you twice the depth!  I think the difficulties of pressurizing the inside are less worthwhile than just designing a stronger hulled craft.  Good question though.  A possible use of this idea might be for low cost shallow diving subs, but then the safety question of the hour would have to do with explosions (as opposed to implosions).

I really enjoy this site lately, thanks everyone!

> ----------
> From: 	Scott Cannard[SMTP:duck@roxby.net.au]
> Sent: 	Monday, February 22, 1999 12:23 AM
> To: 	Personal_submersibles@psubs.org
> Subject: 	Howdy 
> 
> 
> 
> 
> > SAFETY,  yes, it is a big pain in the backside.
> > BUT, can you imagine the restrictions rules and regulations the
> > government will put on us sub builders if we go out doing crushed coke
> > can impressions.
> > By the way hello to all on the psub line. I've (scott cannard, Roxby
> > downs, Australia) been gathering infomation on subs for 6 months now.
> > This site is without doubt the hottest source of infomation
> > yet(including state libraries and asking boat builders dumb questions).
> > Like Jon I dont have many bucks to throw at this but it ts turning into
> > an obsession. Hopefully with it all preplanned as much as
> > possible it should cost heaps less and I won't have a yard full of dud
> > first attempts.I learn every day from you all so thanks and  CHEERS to
> > all
> >         I do have a possible interesting point though. To increase the
> > strength of your dry sub, maybe you should look at increaseing the air
> > pressure inside. I reckon that if you were to increase internal pressure
> > in a ratio to depth you can multiply your hull strength. Of coarse
> > concideration must be given to sealed items inside your sub e.g.
> > instruments, batteries, t.v. picture tubes maybe, even a can of
> > coca-cola, and the bends for the people in it. But if regulated it could
> > be a great bonus to crush resistance and view port strength. Anyone got
> > any ideas or research on that.
> 
> >
>