[PSUBS-MAILIST] gyro compass

Mon Jun 27 23:08:47 EDT 2016

Ian, welcome back!!! Your theory of increased currents makes sense to me.
Hank, I would suggest the following experiment next time out. Get the sub
rotating at depth. Then kill all power and watch the compass while the
sub's momentum keeps her turning.

Best,

Alec

On Mon, Jun 27, 2016 at 10:35 PM, irox via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Hi Hank,
>
> another possibility is that something on your sub is generating a strong
> magnetic field, which only occurs at depth.  An example could some motor
> which is drawing more current (and creating a bigger magnetic field),
> possibly due to pressure around a shaft seal.
>
> Or could it be time related?  As in a electrostatic charge or something
> building up over time, not interfering with the compass at the start of the
> dive in shallow water, but building up and creating problems once at depth.
>
> I'm hoping to use a fiberoptic gyro to aid underwater navigation.
> Possibly in conjunction with a 3D magnetometer/flux-gate-compass.
>
> Cheers,
>   Ian.
> (I was finally able to subscribe to the mailing list again.  But I have
> been following archive for the last few years.)
>
> -----Original Message-----
> From: hank pronk via Personal_Submersibles
> Sent: Jun 27, 2016 2:06 PM
> To: Personal Submersibles General Discussion
> Subject: Re: [PSUBS-MAILIST] gyro compass
>
> Its Aliens, Alan,
> I tried it inside the sub and it tries to work but is totally off.  I did
> squeeze it with the body off to simulate depth and it worked fine in the
> shop being squeezed.
> Hank
>
>
> On Monday, June 27, 2016 2:39 PM, Alan James via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>
> Hank,
> I think your theory about the UFO is looking good at this stage.
> It didn't work at 10ft, that's about 5psi; So have you tried squeezing
> it in various places to replicate that? Or what about mounting it
> inside the hull on a pole in the center of the dome area, as far
> as possible from the hull. If it worked it would eliminate any Alien
> influences & indicate that the water pressure was the problem.
> 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 27, 2016 11:26 PM
> *Subject:* Re: [PSUBS-MAILIST] gyro compass
>
> Alan,
> I took my compass apart and it is perfect, it works perfect in my shop
> etc.  I put it in the lake and it is stuck on N most of the time.  Occasionally
> it will move. I think there is some mineral interference or an old sunken
> UFO messing with it.
> Hank
>
>
> On Monday, June 27, 2016 5:11 AM, Alan James via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>
> Hank,
> why would you want a turn & bank indicator above some sought of compass?
> There are a multitude of inexpensive underwater compasses that scuba
> divers use,
> although they may be a bit small to be read at a distance. Possibly there
> is some
> issue with the compression of the oil stopping your compass from
> functioning?
> Mounting the compass outside the hull seems to be standard practice & I
> haven't
> heard of any failing. Perhaps someone with previous issues with them could
> comment.
> 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 27, 2016 10:37 PM
> *Subject:* Re: [PSUBS-MAILIST] gyro compass
>
> Kieth,
> I stand corrected, a turn and bank indicator is just the ticket and tons
> of them on eBay for cheap.  I was focusing on compass only, but these
> indicators are much cheaper and more available.
> Thanks' for the tip
> Hank
>
>
> On Sunday, June 26, 2016 6:25 PM, hank pronk via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>
> Hi Kieth,
> My understanding is the aircraft units are noisy, I assume that is the air
> units.  They are hard to find in guaranteed working condition for a price
> that works for me.  If you know of any for a descent price-please let me
> know.
> Hank
>
>
> On Sunday, June 26, 2016 6:16 PM, k6fee via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>
> Hank,
>
> Try using a gyro compass ( or atifical horizon) from an aircraft. They sre
> either air, vaccum or electric  powered.
>
> Keith
>
>
>
> Sent from my Verizon, Samsung Galaxy smartphone
>
> -------- Original message --------
> From: hank pronk via Personal_Submersibles <
> personal_submersibles at psubs.org>
> Date: 6/26/16 4:11 PM (GMT-08:00)
> To: Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> Subject: [PSUBS-MAILIST] gyro compass
>
> I am going to try to make a gyro compass, looks doable.  I don't care
> about what direction I am going-I just want to go in a strait line.  I will
> point the sub in the direction I want to go at the surface, then turn on
> the gyro and sink.   Then I can just follow the gyro.
> Hank
>
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