[PSUBS-MAILIST] rpm

[hank pronk via Personal_Submersibles]

Brian,
Yes, I have heard others have had good success with different oils.  Maybe the rpm drop is less with other oils.  
Hank
--------------------------------------------
On Fri, 8/29/14, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Subject: Re: [PSUBS-MAILIST] rpm
 To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
 Received: Friday, August 29, 2014, 11:26 PM
 
 Hank, There is a very thin mineral
 oil that might be better that the wd 40
 
 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] rpm
 Date: Fri, 29 Aug 2014 13:23:31 -0700
 
 Vance,
 Yes for sure, Gamma has two separate amp gauges, one for the
 motor and one for the rest of the sub. All 24v and the
 trolling motor is 12 v
 Hank 
 --------------------------------------------
 On Fri, 8/29/14, via Personal_Submersibles <personal_submersibles at psubs.org>
 wrote:
 
  Subject: Re: [PSUBS-MAILIST] rpm
  To: personal_submersibles at psubs.org
  Received: Friday, August 29, 2014, 4:03 PM
  
  Yeah, too
  simple. Maybe that's a good guess, but..... I will say
  that an ammeter in the boat is a good thing. You can keep
 an
  eye on things, and if it goes UP at some stage, you would
  suspect a thruster issue (a tangle, or a bearing failure
 or
  whatever). All it takes is an appropriate shunt and a
 gauge
  (in my pre-digital steampunk mind). Okay, thanks anyway. I
  was curious, that's all.
  Vance
  
  
  
  
  
  
  -----Original
  Message-----
  
  From: hank pronk via Personal_Submersibles
  <personal_submersibles at psubs.org>
  
  To: Personal Submersibles General Discussion
  <personal_submersibles at psubs.org>
  
  Sent: Fri, Aug 29, 2014 3:56 pm
  
  Subject: Re: [PSUBS-MAILIST] rpm
  
  
  
  
  
  
  
  
  
  Vance,
  I did not do an amp draw test because I do not have the
  technology in house. I 
  would guess with a 10% rpm drop, there may be a 10% amp
  increase. That would be 
  to simple :-)
  
  Hank
  --------------------------------------------
  On Fri, 8/29/14, via Personal_Submersibles <personal_submersibles at psubs.org>
  
  wrote:
  
   Subject: Re: [PSUBS-MAILIST] rpm
   To: personal_submersibles at psubs.org
   Received: Friday, August 29, 2014, 3:39 PM
   
   Hank,
   Did you check the amperage? I wonder if the
   resistance causes a higher draw, and if so, how
   much?
   
   Vance
   
   
   
   
   
   
   -----Original
   Message-----
   
   From: hank pronk via Personal_Submersibles
   <personal_submersibles at psubs.org>
   
   To: personal_submersibles
   <personal_submersibles at psubs.org>
   
   Sent: Fri, Aug 29, 2014 3:33 pm
   
   Subject: [PSUBS-MAILIST] rpm
   
   
   
   
   
   
   
   
   
   I am working on a hydraulic
   pump that will be external and pressure compensated 
   in oil.  I am using a trolling motor to drive
 the pump.  A
   while back there was 
   a question about rpm drop when a trolling motor is
 filled
   with oil.  I bench 
   tested that today, and the motor runs at 2,000rpm
 stock and
   1,800 rpm full of 
   WD40.
   Hank
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