[PSUBS-MAILIST] gyro compass

Tue Jun 28 06:15:54 EDT 2016

Hi Ian,It could be as you say, some electric field problem.  I have been trying for two seasons to sort it out and I am done with magnetic compass navigation.  I am getting dizzy going in circles ;-)  i have high hopes for the gyro turn indicator.Hank

    On Monday, June 27, 2016 8:36 PM, irox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 #yiv8403528067 #yiv8403528067 -- DIV {margin:0px;}#yiv8403528067 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 squeezingit in various places to replicate that? Or what about mounting itinside the hull on a pole in the center of the dome area, as faras possible from the hull. If it worked it would eliminate any Alieninfluences & 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 someissue with the compression of the oil stopping your compass from functioning?Mounting the compass outside the hull seems to be standard practice & I haven'theard 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 tipHank 

    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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