[PSUBS-MAILIST] compass

[T Novak via Personal_Submersibles]

Hank,

 

The aircraft compass may be the answer.  The difficulty is that the steel hull is deflecting the natural magnetic lines of the earth.  Steel ships get over this to a certain extent by degaussing the ship.  This is likely not an option.  I read somewhere that WWII subs could not us a magnetic compass at all, but rather used a directional gyro. The cheaper aircraft direction gyro's are vacuum powered, but there are electrical powered dg's available.  You would not need a flight certified one.  EBay has a few but most don't say whether they are vacuum or electric.

 

What do the others with the K-subs use?  What does Phil install in the larger passenger (Aquarius) subs?

 

Tim

 

From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of hank pronk via Personal_Submersibles
Sent: July-31-15 3:18 AM
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Subject: [PSUBS-MAILIST] compass

 

Tim,

I am all ears about the aircraft compass,  any suggestions?   I don't get why it is not working, I can rotate the compass body and the ball inside stays fixed on the direction.  When I travel on the bottom at 270 degrees, I deviate and correct and I expect to loosely track but maintain my direction.  When I surface I am facing the opposite direction.  Hmmm I wonder if the sub is rotating during the assent,  that would make sense.  I will have to watch the compass while I am surfacing, maybe the sub develops a spin.

Hank

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