[PSUBS-MAILIST] rpm

Sat Aug 30 09:22:58 EDT 2014

Hank,

I don't know if you will find an oil with lower viscosity than WD40.   The 
problem with WD40 is that it is a solvent that damages plastic and rubber  
components within the motor.  Alec Smyth did a lot of testing on various  
oils.  The last I knew the medium of choice was Marvel Mystery Oil.   It's safe 
for the seals, etc., and has a lower viscosity than any straight  mineral 
oil.

For thrusters, comparative amp draw at a given RPM (with associated heat  
build-up) is probably more significant than drop in maximum RPM since we're  
not generally operating at maximum.  That might not be true when you're  
using the motor to operate a pump.

Jim

In a message dated 8/30/2014 5:51:09 A.M. Central Daylight Time,  
personal_submersibles at psubs.org writes:

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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