[PSUBS-MAILIST] Alec's new sub

[Private via Personal_Submersibles]

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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