[PSUBS-MAILIST] glueing aluminum

[Alec Smyth via Personal_Submersibles]

Compressed air at 140psi, from a 1st stage. They are normally closed. Give
them a shot of air and they open. Cut off the air and they are closed by a
spring.

On Fri, Dec 22, 2017 at 9:27 PM, hank pronk via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Wow!!! that will go down like a rock, what drives them?
> Hank
>
> On Friday, December 22, 2017, 6:36:20 PM MST, Alec Smyth via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>
> Did you mean to say "ballast tank?" Working on it! Just this evening I
> finished making a set of five "mushroom" valves - four for the boat and one
> spare. I've been testing them by installing them in the bottom of a bucket
> and using them to dump the water. Monday I'll take them to be anodized, and
> when I get them back will take photos and post something on the projects
> page. They're a Hugh Fulton design and I have to say I'm impressed, he did
> an absolutely amazing job. The root of Shackleton's problems was water
> blocking in the MBT vent lines, which turns out to be a hard problem to
> solve with the raft configuration MBTs because the lines have a lot of
> horizontal ground to cover. Since mushroom valves use no vent line, there
> can't be water blocking and I'm hoping they're the solution. Next up, I'm
> going to go into calculations and design mode and make new MBTs that
> leverage these valves. It'll be interesting diving with these, the sub
> should submerge in seconds. It's four valves that are three inches in
> diameter each.
>
> Best,
> Alec
>
> On Fri, Dec 22, 2017 at 7:35 PM, hank pronk via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Alec,
> My research so far shows that aerospace parts are glued also.  I am sure
> the Lotus folks are pretty closed lipped about how they do it.  I will do
> some testing, just checking with the group to save some time and headache.
> What are you using for a ballast an now?  or is it a surprise.
> Hank
>
> On Friday, December 22, 2017, 5:29:20 PM MST, Alec Smyth via
> Personal_Submersibles <personal_submersibles at psubs. org
> <personal_submersibles at psubs.org>> wrote:
>
>
> Lotus Cars famously have done that, introducing bonded aluminum chassis
> with the Elise and continuing it on subsequent models. The reason is that
> welding weakens the material, so if it were welded they would need to
> increase the amount of material and it would eat up the weight savings.
> Problem is, I don't know the specifics of the glue they use nor the
> process.
>
> Best,
> Alec
>
> On Fri, Dec 22, 2017 at 6:57 PM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.
> org <personal_submersibles at psubs.org>> wrote:
>
> Hi All,
> I have an idea that requires glueing aluminum plates together.  Has anyone
> tried this?  any success?
> Hank
>
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