[PSUBS-MAILIST] just more calc

[Alan James via Personal_Submersibles]

Hi Roberto,>>>learn that i can be safe on a composite hull, even a wood hull below the 100 ft i can dive even on an oil drum ....  NO you won't be safe with any of those 3. Years ago we calculated that an oil drum wouldn't be safe to 15ft, & it also depends on it's condition.Fiberglass is very difficult to analyze for strength due to the human equation, the saturation of the cloth & the fact that the cloth has different strengths indifferent directions. At 100ft there is about 7,200lb pressure on every square foot of your hull, so calculations have to be very accurate to avoid being paste in a can on the sea bed:).Did you see Phil Nuyten's paper on life support. It is very good.Alan
      From: roberto alvarez via Personal_Submersibles <personal_submersibles at psubs.org>
 To: personal_submersibles at psubs.org 
 Sent: Thursday, November 13, 2014 7:11 AM
 Subject: [PSUBS-MAILIST] just more calc
   
Good morning this weekend i read the book on the psubs website as i can read ,is a collection of designs and experiences, i am working with the air volume and CO2 production, this because i divide the project in 3 main areas, pressure hull-life support-control & propultion
learn that i can be safe on a composite hull, even a wood hull below the 100 ft i can dive even on an oil drum , the  main concern will be O2 depletion and CO2 pollution we exhale 1.7 cubic feet hour  and by coincidence we need 1.7 cubic meters per day
will use this info for a better internal space before any other consideration, yesterday i went to a LPG truck scrap yard, found that the inside of the tanks are free of rust, they have  wave brakers ( internal plates ) have inspection holes with 2 inch tempered glass and  build from 0.500 inch plate, 54 inch in diameter and 12 feet lengh,  

may be other option


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