[PSUBS-MAILIST] gyro compass

Tue Jun 28 21:46:51 EDT 2016

Yes it is consistent just biased.  When I power down, it would return to correct heading. 

Cliff

Cliff Redus

> On Jun 28, 2016, at 7:59 PM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Hi Cliff,
> When your compass go out of whack, is it consistent?  Can you coast with the motors off and get a new heading?
> 
> Hank
> 
> 
> On Tuesday, June 28, 2016 12:40 PM, Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 
> I have used over the last four year in the R300 the Ocean Server OS5000-S 3 Axis Digital Compass (Serial) https://oceanserver-store.myshopify.com/collections/compass-modules/products/os5000-s-3-axis-digital-compass-serial .  This is similar to what Sean has posted but I think a little less sophisticated. This device gives you roll, pitch, yaw, temperature and compass heading as a serial ascii string that I parse in the PLC via a RS 232 connection.   It cost $325.  I have it installed in a small I atm 6061-T6 aluminum pod behind the pilot on the exterior of the pressure hull about 6 inches and just below the FRP shell.  When I had the large DC traction motor I would notice that magnetic field generated by the motor and wiring distorted the reading relative to amount of current.  That is at low speed, when the motor was not drawing much power, the compass was spot on but as I increased the boat speed and the motor current would increase that the compass heading would be shifted 20-30 degrees.  When you let off the throttle, it would return to original heading.  Now that I have replaced the large DC traction motor with two MK-101 based thrusters, this effect has been reduced but not eliminated.
> 
> Cliff
> 
> 
> 
> On Mon, Jun 27, 2016 at 10:44 PM, Sean T. Stevenson via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> https://www.microstrain.com/inertial/nodes
> Sean
> 
> 
> On June 27, 2016 9:10:25 PM MDT, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> Hank,   do you know if there are any cheap inertial navigation systems out there?  I would thing the robotics people might have something like that .
>  
> Brian
> 
> --- personal_submersibles at psubs.org wrote:
> 
> From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] gyro compass
> Date: Mon, 27 Jun 2016 21:06:25 +0000 (UTC)
> 
> 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 Discuss! ion <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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