The Hull Truth - Boating and Fishing Forum

Go Back   The Hull Truth - Boating and Fishing Forum > BOATING FORUMS > The Boating Forum
Search

Notices

Random Quote: Life isn't cheap!
Closed Thread
 
Thread Tools Search this Thread
Old 08-18-2004, 12:06 AM
  #1    
Senior Member
 
Join Date: May 2004
Location:
Posts: 212
Default What is compass dampening fluid?

I have heard that it's no more than low odor mineral spirits, is this true?

I have a hockey puck style handbearing compas that has leaked some fluid. I want to get a new "O" ring for it and try to refill it. It seems pretty straight forward except I haven't figured out how to get that last bit of air out or am I supposed to leave a bubble in? Any ideas on how to proceed?


Thanks, Rob
Recoil Rob is offline  
Old 08-18-2004, 05:28 AM
  #2    
Senior MemberCaptains Club MemberPLEDGER
 
Join Date: Jan 2003
Location: Boat Jupiter/Home PBG
Posts: 2,643
Default RE: What is compass dampening fluid?

I thought it was Mineral Oil, not Mineral Spirits.
Blue C's is offline  
 
Old 08-18-2004, 07:28 AM
  #3    
Senior MemberCaptains Club Member
 
Join Date: Apr 2002
Location: Virginia Beach, Va
Posts: 3,731
Default RE: What is compass dampening fluid?

Most companies use alcohol.* The fluid can vary according to each company's design and goals.* Here's what SIRS' Compass says about their fluid.*[*]What is the Silicone damping for ?

The compass card needs to be damped to prevent it from over-swinging and becoming too sensitive to aircraft movements. . We use the silicone fluid to control card movement as this has a much better damping property than the normal Kerosene or alcohol alternatives. Additionally, silicone fluid has a viscosity value that remains virtually constant throughout the operating temperature range of the compass.

By using a smaller card inside the compass, than used in other compass units, we are able to reduce the forces subjected on the body of the card. The apparent compass card size, that is an industry standard,* is actually magnified by the spherical front face of the compass bowl.[/list]
__________________
Work is that annoying time between
fishing trips.
Mud Runner is offline  
Old 08-18-2004, 07:51 AM
  #4    
Senior MemberCaptains Club Member
 
Join Date: Feb 2003
Posts: 22,749
Default RE: What is compass dampening fluid?

I would figure the easiest way to eliminate the air bubble would be to close the unit while submerged in the fluids used to fill the compass.
Garett is offline  
Old 08-18-2004, 08:15 AM
  #5    
Senior MemberCaptains Club Member
 
Join Date: Jan 2003
Location: Annapolis, Md.
Posts: 4,907
Default RE: What is compass dampening fluid?

Not sure about your handheld, but you can read about the fluid Ritchie uses in their units here:
http://www.ritchienavigation.com/service/faq.html

Quote:
What type of fluid is in my Ritchie Magnetic Compass?

Ritchie uses Odorless Mineral Sprits on all Spherical Dome Compasses. Some old style Flat Top Compass (no longer manufactured) used an Isopropyl Alcohol and Water mix. This process was stopped in the 1960ís. If you have a Flat Top Compass it is recommended that you test the fluid to see if it is Odorless Mineral Sprits or Isopropyl Alcohol.
__________________
.
Capt. Kevin ~~~~~~~~~~><((((*>


2520 MVSC "Chesapeake Edition"
Annapolis, Maryland
http://ClassicParker.com/
Megabyte is offline  
Old 08-18-2004, 08:20 AM
  #6    
Senior MemberCaptains Club Member
 
Join Date: Jun 2004
Location: NE Ohio
Posts: 220
Default RE: What is compass dampening fluid?

Ritchie compasses use odorless mineral spirits. I can't imagine any compass using mineral oil--too thick. I've filled my compass several times, so I know it works. To get that last air bubble out, try using a syringe. The filler hole is very small and likes to trap air inside the unit.
Workdog1 is offline  
Old 08-19-2004, 04:44 PM
  #7    
Junior Member
 
Join Date: Apr 2002
Location: suwannee, fl.
Posts: 9
Default RE: What is compass dampening fluid?


Tip from Ritchie that we've used with great results.

Chill ( put in the 'frig ) the odorless mineral spirits before refilling compass.
donel is offline  
Old 08-19-2004, 05:19 PM
  #8    
Junior MemberCaptains Club Member
 
Join Date: May 2004
Location:
Posts: 26
Default RE: What is compass dampening fluid?

Where can you buy the mineral spirit? Is it as staright forward to replace the oil? Mine has all come out.
akisp is offline  
Old 08-19-2004, 06:30 PM
  #9    
Senior Member
 
Join Date: Sep 2002
Location: Middle Chesapeake Bay
Posts: 301
Default RE: What is compass dampening fluid?

Buy it at Lowes, Wal-Mart, etc. Look in the paint stuff.
BluesFan is offline  
Old 08-19-2004, 08:45 PM
  #10    
Senior Member
 
Join Date: May 2004
Location:
Posts: 212
Default RE: What is compass dampening fluid?

Quote:
donel - 8/19/2004 5:44 PM


Tip from Ritchie that we've used with great results.

Chill ( put in the 'frig ) the odorless mineral spirits before refilling compass.
What the reasoning behind that? Seems to me that when the spirits warm up and expand the seal on the compass might leak under pressure.

Recoil Rob is offline  
Old 08-23-2004, 05:37 PM
  #11    
Senior Member
 
Join Date: May 2004
Location:
Posts: 212
Default RE: What is compass dampening fluid?

TTT - still would like to know what effect chilling the fluid has.

Rob
Recoil Rob is offline  
 
 
Closed Thread

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Compass Fluid Replacing FishinPole2 The Boating Forum 2 07-14-2008 04:30 AM
I need someone who is a compass adjuster and also can fill a compass with compass oil sundancejoel Marine Electronics Forum 3 02-08-2008 05:44 AM
Sound Dampening - Lead or Foam? PnL The Boating Forum 6 05-30-2007 07:12 PM
Binoculars: Compass or no compass? outerbanks The Boating Forum 9 02-16-2005 07:40 AM
compass fluid petros The Boating Forum 17 04-07-2003 07:41 PM

 



©2009 TheHullTruth.com

Powered by vBulletin® Version 3.7.6
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.2.0