[PSUBS-MAILIST] Air compensating thrusters

[via Personal_Submersibles]

I looked that up. 70% mineral oil, 24% stoddard solvent (turpentine), and 1% lard. How about that for a combination?
Vance




-----Original Message-----
From: Alec Smyth via Personal_Submersibles <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Sent: Sun, Jul 27, 2014 10:17 am
Subject: Re: [PSUBS-MAILIST] Air compensating thrusters


Yes. It is extremely low viscosity and before using it, I left snips of the motor's cables in a little jar of it for some months to make sure the insulation was not affected.


Thanks,

Alec




On Sun, Jul 27, 2014 at 9:49 AM, Jon Wallace via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

          
    

      Alec, just for completeness, what oil do you use in your MK's?  Is      it marvel mystery oil?
      
      Jon

      
      
      On 7/26/2014 10:43 PM, Private via Personal_Submersibles wrote:
    

    
            
Alan, honestly you're over-analyzing this one. I would        summarize it thus; air and oil compensation both work just fine,        pick either one.
      

      
      
I've run Snoopy with both air and oil compensation, using the        same motors. I could not tell the difference, either in power or        even in sound. I do agree the motors must in theory lose some        efficiency with oil, but it was not in the least noticeable to        me. 
      

      
      
Personally I prefer oil because the system has no moving        parts and therefore in my book is simpler and more reliable, but        again... both work just fine. 
      

      
      
As for all the stuff about dissolving plastics and brushes, I        finally overhauled the thrusters last year for the first time.        All I had to do was change the seals and brushes, and I  turned        the commutator on the lathe because the copper had some wear.        These parts had lasted a decade. 
      

      
      

      
      
Best,
      

      
      
Alec      
    
    
  

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