[PSUBS-MAILIST] Alec's new sub

[Alec Smyth via Personal_Submersibles]

Ugh, typo. Where I said "shaft seal" I meant to say "shaft collar".

On Sun, Jun 28, 2015 at 9:21 PM, Private <alecsmyth at gmail.com> wrote:

> Correct!
>
> The little O ring under the threaded contacts on the hull side has two
> purposes. It prevents water coming into the sub if you drop the thruster,
> but it also acts as a spring to maintain good electrical contact. When the
> thruster is off, the sub side contact sticks out very slightly above the
> rest of the penetrator, so when you draw the motor toward the sub the
> contact squeezes its O ring.
>
> The contacts on the sub side go through a nylon insert sealed with O rings
> and locked by a shoulder in the SS insert. On the thruster side the
> contacts and cables are potted, but because the thruster is oil filled the
> potting is not subject to any pressure.
>
> The bolt has a shaft seal that prevents it being pushed into the sub if
> you drop the thruster.
>
> The thrusters are fixed, not rotating. The benefit of this design is that
> there are neither cables nor tubes to sever - you just need to switch off
> power to the thruster before dropping it, and the dropping itself is just
> three or four turns of a bolt.
>
> Best,
>
> Alec
>
>
>
> On Jun 28, 2015, at 7:55 PM, Alan James via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> I think I understand it now.
> The 2 bolts are the electrical through hulls & you wind the
> central nut to push the unit off. The electrics would unplug in the
> process.
> Alan
>
>   ------------------------------
>  *From:* hank pronk via Personal_Submersibles <
> personal_submersibles at psubs.org>
> *To:* Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> *Sent:* Monday, June 29, 2015 10:02 AM
> *Subject:* Re: [PSUBS-MAILIST] Alec's new sub
>
> Alec,
> Nice project, I like the trawl floats in the back, it is so different!
> The first thing that comes to mind when I see your new build is, Manatee.
> You sure have put in a lot of time on this.  I like the jettisoning
> system, it is the same idea as Gamma's tail, very simple and clean.  The
> bellows are very nice!
> Nice video, you have good control of the sub.
> Hank
> --------------------------------------------
> On Sat, 6/27/15, Alec Smyth via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Subject: [PSUBS-MAILIST] Alec's new sub
> To: "Personal Submersibles General Discussion" <
> personal_submersibles at psubs.org>
> Received: Saturday, June 27, 2015, 10:40 PM
>
> Hey everyone, I'm
> breaking cover with the project sub. It is in need of a
> name. If the pictures inspire any thoughts that are not
> rude, I'm all ears for suggested names!
> http://www.psubs.org/projects/1234567810/newsub/
>
>
> Best,
> Alec
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>
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