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Hi Al, The short answer is I'm just that kind of special nut case. Part of my answer you will see in my post to Brian. One reason why I don't want to put the syntactic foam on the out side of this K-250 is that it would change it's look to much, and since it's an original Kittredge built sub I don't want to hide it. I'm wanting to fill in all the void space between the support ribs to clean up the interior, and give the subs hull a large amount of additional strength. Below is an article I found some time back that really opened my eyes. =================================================== "Defense Technical Information Center Accession Number : AD0605963 Title : SYNTACTIC-FOAM, FILAMENT-WOUND COMPOSITE PRESSURE HULLS. Descriptive Note : Final rept., Corporate Author : GM DEFENSE RESEARCH LABS SANTA BARBARA CALIF Personal Author(s) : Robertson,R. M. Report Date : SEP 1964 Pagination or Media Count : 73 Abstract : External hydrostatic pressure tests were conducted on 12 fiberglass filament-wound cylinders, each 12 in. long with an ID of 5 in. Six of these had a wall thickness of 0.210 in., designed to fail by buckling at 2000 psi; the other six had a wall thickness of 0.305 in., designed to fail by buckling at 5000 psi. Three of each type were covered with an external coating of INLYTE (a buoyant syntactic foam previously developed by the contractor in an effort to stabilize the G. R. P. against buckling. The syntactic foam density was 44 lb/cu. ft. The six uncoated cylinders were used as controls. Long cylinders of fiberglass exhibit collapse characteristics under external hydrostatic pressures. The compressive stresses are not developed to their full potential. The tests were conducted to determine if a coating of syntactic foam would stabilize the units to allow more efficient use of the compressive stress. Conclusions: By coating cylinders with a layer of low-density syntactic foam, such as INLYTE, the unit is stabilized in the buckling mode, and a great increase in strength is achieved before rupture from externally-applied hydrostatic pressure. Also, the buoyancy of the composite structure is significantly increased. (Author) Descriptors : *SUBMARINE HULLS, COMPOSITE MATERIALS, PRESSURE VESSELS, HYDROSTATIC PRESSURE, UNDERWATER, EXPANDED PLASTICS, GLASS TEXTILES, PLASTIC COATINGS, RUPTURE, BUOYANCY, DENSITY, BUCKLING, EPOXY RESINS, CYLINDRICAL BODIES, SPHERES, GLASS. Distribution Statement : APPROVED FOR PUBLIC RELEASE Search DTIC's Public STINET for similiar documents. Members of the public may purchase hardcopy documents from the National Technical Information Service. " Regards, Szybowski From: wreckdiver@frontiernet.net To: personal_submersibles@psubs.org Subject: RE: [PSUBS-MAILIST] Polyurea Coatings for Submarines Date: Fri, 10 Jul 2009 00:14:07 -0400 Hi Brent,
Stupid question…why are you putting syntactic foam on the *INSIDE* of your sub????
Al Secor
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Brent Hartwig
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