September 13, 2011 at 5:05 am #1629
So after some discussion on the captian nemo float thread, anyways here’s a thread on submarine windows.
Typically submarine windows are acrylic which are very difficult to make, typically by hired professionals, for large amounts of money.
So here we’ll be exploring various materials that could be used for submarine windows.
Some suggestions have ranged from resin-molds, to fiber-optic-cables.
who knows maybe we could even use glass-bricks.
Anyhow, so I’ve decided to make a submarine window prototype with a clay mold, canola oil release agent, and epoxy resin.
here is a photo of the clay mold:
here is a photo of materials:
here is a video of using materials and mixing in epoxy:September 13, 2011 at 4:12 pm #15521
what about using leftover or odd size bulletproof glass, it is usually a sandwich with many layers of acrylic sheeting inbetween glass paines, I see them for sale on ebay regularly
http://outpostalpha.comSeptember 13, 2011 at 4:20 pm #15520
This theme is quite tricky – all submarine viewports are made of thick cast acrylic – the resin is curing in a process that creates a LOT of heat so forms for thick walled acrylics are surrounded by a water bath to deal with that heat. The process also tends to create bubbles within the material – so the whole casting process is done in a pressure chamber. Even so bubbles appear on the contact area between form and resin – the manufactureres solv e this problem by making the piece bigger and machining it down a couple of milimeters to get rid of the bubble zone and produce a perfect transparent viewport. After that the viewport has to be heat treated to reduce tension build up – it will shrink in this process up to 10%. It also needs to be polished for hours to get a transparent surface.
All this explains the tremendous cost of thick acrylic pieces in high optical quality. To get good results is almost an art form.
building viewports from other plastics (epoxy, lexan) has been discussed but did not get implemented as far as i know.
The tradition to do it in acrylics goes back to piccard and trieste – this sub reached the mariana trench 11.000 m with acrylic viewports (cone shape).
Busby, who is kind of moses in submarine design said that acrylic is the indicated material because it will give you a warning sign in form of a crack BEFORE it fails definitly – so you can end the dive with a cracked viewport and still walk out alive.
Then came stachiw with his 1000 page plus book about acrylic viewports in submarines and since then all has been acrylic.
So shred if you try it in other plastics you are basicly on “new territory”.
A dome viewport in the 6 foot diameter area can easyly cost 50k if you buy it as classified submarine viewport. A acrylic piece of the same shape and appearance purchased from a decorative item shop can cost only 500 USD.
What ever you decide to do in submarine windows keep in mind that testing it at a load 3 times the load you plan to use it would be a prudent approach.
Also keep in mind that plastics are suceptible to cyclic fatique dome viewports on tourist submarines are changed after 10.000 dives due to fatique reasons (recommended by stachiw – and took over by most regulatory norms about pressure vessel viewports)
concretesubmarineSeptember 23, 2011 at 3:11 am #15620
Ya, bulletproof glass, interesting idea.
I’m rather sure that most resins would crack before failing…
So I ended up making 2 different lenses, one with oil and one without, the one with oil, took a long time to dry, and ended up falling apart rather easily, the one without turned out rather well, even though a little clay got stuck to it, can likely file it off.
here is the video:
calm aware desire choice love express intuit moveSeptember 25, 2011 at 2:25 pm #15656
I know a secret….
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