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<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>I got good results with a
(raymarine) fluxgate. The sensor is placed in the all aluminium bow section ( <st1:metricconverter
ProductID="0,9 Meter" w:st="on">0,9 Meter</st1:metricconverter> away from the
hull) and the readout can placed anywhere.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>It can electronically compensate
10 or 12 deg deviation caused by the steel. The sistership has the sensor in a
short mast also with good results.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Attached a sketch of the
pressuretight sensor housing.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Regards, Emile<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>Van:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
Personal_Submersibles [mailto:personal_submersibles-bounces@psubs.org] <b><span
style='font-weight:bold'>Namens </span></b>"<st1:PersonName
ProductID="Carsten Standfuß" w:st="on">Carsten Standfuß</st1:PersonName>"
via Personal_Submersibles<br>
<b><span style='font-weight:bold'>Verzonden:</span></b> woensdag 3 december
2014 20:46<br>
<b><span style='font-weight:bold'>Aan:</span></b> Personal Submersibles General
Discussion<br>
<b><span style='font-weight:bold'>Onderwerp:</span></b> Re: [PSUBS-MAILIST]
gyroscope compass</span></font><o:p></o:p></p>
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12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'>Gyros in aricraft are not north stable - they
need a magnetic compass or other device to set course. But they are
okay if you set course according to your GPS course before you dive. They
can hold the course for some hours with a movment of 2-4 deegre per hour. Okay
for a slow and small Psub. They are vaccum driven or electric. Vaccum driven
you can not use in a small submarine. (Or you need a silencer and eardrums as
in Spurdog). Electric you can use if it is a 12 or 24 V DC driven one. For
other voltage you need a special power converter. The Ebay units are sometimes
cheap - between 100-800 USD - but most of them work not proper. They are
build out of the planes for exact that reason and sold as they are and without
any waranty.. Size is around 100x100x400mm. Volume <st1:metricconverter
ProductID="4 Liters" w:st="on">4 Liters</st1:metricconverter>.. Good solution
if you buy a unit in aircraft condition with papers from a aircarft surplus
dealer with a working garanty. Make sure that they get not wet or 100%
humidity. <br>
<br>
Gyros in ships are north stabilzed. The need around 40 Minutes to warm up. They
are much bigger - the smallest one are around 300 x 400 x <st1:metricconverter
ProductID="300 mm" w:st="on">300 mm</st1:metricconverter>. Volume at minimum <st1:metricconverter
ProductID="36 liter" w:st="on">36 liter</st1:metricconverter>. They need no
calibration or reference and they are stable over month/years. Problem is that
they normal switch on in a ship and never switch off.. If you switch of them -
make sure that you not move the sub in the next hours - otherwise they can be
damaged. They are expensive - about 30000 USD new and 3000-9000 USD second
hand. There life time is limited 30000 - 40000 hours between first
failtures. <br>
<br>
I have both types in the Euronaut. And a magnetic one also. <br>
The gyros are both cheap Ebay ones. One from a aircraft one from a ship. <br>
And both not working anymore. And the third magnetic one has a big error
because of the 60 ts steel below. <br>
<br>
I will by next a second hand one north stabilzed ship gyro for around 3000 USD
from a ship scrap yard electronic dealer with a confirm that they test it and
its run stable but without any further waranty. <br>
<br>
A fluxgate its a kind of electronic coils magnetic field compass and will in
most cases not work proper on a strong magnetic metal shell like a submarine
with strong electric motor fields etc. To test on your submarine if these cheap
devices runs on you submarine install a simple magnetic compass temporary on
the sensor spot in mind and than turn the submarine 360 degree. Switch on
and off all electric devices. <br>
Cross check with another compass (or the same one) far away from the sub.
<br>
<br>
In most cases an electric 12 or 24 V Dc driven Airplane direction gryro in
combination with a gps course before diving will do the job. But in 99% a ebay
100 USD item will not work proper. <br>
<br>
vbr Carsten<br>
<br>
<br>
<br>
<br>
</span></font><br>
<br>
"hank pronk via Personal_Submersibles" <<a
href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>>
schrieb:<br>
> <br>
> There are all kinds of them on ebay for under 100 dollars, problem is how
to make it work. I assume they just have a small motor that spins. There is a
nice ship gyro sitting at 50 dollars right now but it is about <st1:metricconverter
ProductID="1 foot" w:st="on">1 foot</st1:metricconverter> dia. That would be
awesome in a big sub.<br>
> Hank --------------------------------------------<br>
> On Wed, 12/3/14, Alec Smyth via Personal_Submersibles <<a
href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>>
wrote:<br>
> <br>
> Subject: Re: [PSUBS-MAILIST] gyroscope compass<br>
> To: "Personal Submersibles General Discussion" <<a
href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>
> Received: Wednesday, December 3, 2014, 1:48 PM<br>
> <br>
> Absolutely. You can get small ones for civil<br>
> aviation and they are used in subs. One challenge is that<br>
> most airplane ones are powered by a vacuum, but there are<br>
> 12V models. Unfortunately they're expensive, but a great<br>
> solution if you can afford it. <br>
> Alec <br>
> On Wed, Dec 3, 2014 at 1:28<br>
> PM, hank pronk via Personal_Submersibles <<a
href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>
> wrote:<br>
> Hi<br>
> all,<br>
> <br>
> Ever hear of a gyroscopic compass, seems that ships used to<br>
> use them. It seems they would not be effected by a<br>
> submarine hull. What am I missing besides they are very<br>
> big.<br>
> <br>
> Hank<br>
> <br>
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