[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [PSUBS-MAILIST] Glass microspheres idea - why ?



Peter,
           On my sub I'm going to have these long rails which have a dimension of 2"x1/2"x 10'   I was planning on making them stainless steel,  but the thought has crossed my mind to make them using a hardwood like oak and seal with epoxy.  It sure would cut the cost a lot.  The rails hold everything onto my superstructure of ferro-cement, another advantage would be no dissimilar metals in contact.  Since I'm going to have many of these rails running longways they may be strong enough due to the multiple number of them.  I might have to go a bit thicker however.
 
Brian 
----- Original Message -----
Sent: Sunday, April 22, 2007 07:38
Subject: Re: [PSUBS-MAILIST] Glass microspheres idea - why ?

Hi Psubbers,
 
 
In my limited knowledge - flotation - that is extra incompressible buoyancy - is used only for ultra deep dives. In my understanding tits used when a U-boats pressure hull gets so heavy due to structural loads that it itself will not be buoyant. The classic example of this would be the Trieste bathyscaphe. Trieste used a gasoline tank - absolutely incompressible - but not that efficient at - 250 kg lift pr. m3.
 
Who do a psubs need this when the designer is working in the 300 feet range ?? If he really needs it - my practical idea would be to make use of wood.
 
Dry pine wood has a density of about 500 kg / m3, and painted with epoxy or sealed with polyester / fiberglass it would form a nice simple solution in the depth range we are talking about.
 
Best Regards,
 
Peter Madsen


Jeg beskyttes af den gratis SPAMfighter til privatbrugere.
Den har indtil videre sparet mig for at få 13099 spam-mails
Betalende brugere får ikke denne besked i deres e-mails.
Hent en gratis SPAMfighter her.