<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content="text/html; charset=US-ASCII" http-equiv=Content-Type>
<META name=GENERATOR content="MSHTML 11.00.9600.17239"></HEAD>
<BODY id=role_body style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; COLOR: #000000"
bottomMargin=7 leftMargin=7 rightMargin=7 topMargin=7><FONT id=role_document
color=#000000 size=2 face=Arial>
<DIV>Hank,</DIV>
<DIV> </DIV>
<DIV>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.</DIV>
<DIV> </DIV>
<DIV>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.</DIV>
<DIV> </DIV>
<DIV>Jim</DIV>
<DIV> </DIV>
<DIV>
<DIV>In a message dated 8/30/2014 5:51:09 A.M. Central Daylight Time,
personal_submersibles@psubs.org writes:</DIV>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><FONT
style="BACKGROUND-COLOR: transparent" color=#000000 size=2
face=Arial>Brian,<BR>Yes, I have heard others have had good success with
different oils. Maybe the rpm drop is less with other oils.
<BR>Hank<BR>--------------------------------------------<BR>On Fri, 8/29/14,
Brian Cox via Personal_Submersibles <personal_submersibles@psubs.org>
wrote:<BR><BR>Subject: Re: [PSUBS-MAILIST] rpm<BR>To: "Personal Submersibles
General Discussion" <personal_submersibles@psubs.org><BR>Received:
Friday, August 29, 2014, 11:26 PM<BR><BR>Hank, There is a very thin
mineral<BR>oil that might be better that the wd 40<BR><BR>Brian<BR><BR>---
personal_submersibles@psubs.org<BR>wrote:<BR><BR>From: hank pronk via
Personal_Submersibles <personal_submersibles@psubs.org><BR>To: Personal
Submersibles General Discussion
<personal_submersibles@psubs.org><BR>Subject: Re: [PSUBS-MAILIST]
rpm<BR>Date: Fri, 29 Aug 2014 13:23:31 -0700<BR><BR>Vance,<BR>Yes for sure,
Gamma has two separate amp gauges, one for the<BR>motor and one for the rest
of the sub. All 24v and the<BR>trolling motor is 12 v<BR>Hank
<BR>--------------------------------------------<BR>On Fri, 8/29/14, via
Personal_Submersibles
<personal_submersibles@psubs.org><BR>wrote:<BR><BR> Subject: Re:
[PSUBS-MAILIST] rpm<BR> To: personal_submersibles@psubs.org<BR>
Received: Friday, August 29, 2014, 4:03 PM<BR> <BR> Yeah,
too<BR> simple. Maybe that's a good guess, but..... I will say<BR>
that an ammeter in the boat is a good thing. You can keep<BR>an<BR> eye
on things, and if it goes UP at some stage, you would<BR> suspect a
thruster issue (a tangle, or a bearing failure<BR>or<BR> whatever). All
it takes is an appropriate shunt and a<BR>gauge<BR> (in my pre-digital
steampunk mind). Okay, thanks anyway. I<BR> was curious, that's
all.<BR> Vance<BR> <BR> <BR> <BR> <BR>
<BR> <BR> -----Original<BR> Message-----<BR>
<BR> From: hank pronk via Personal_Submersibles<BR>
<personal_submersibles@psubs.org><BR> <BR> To: Personal
Submersibles General Discussion<BR>
<personal_submersibles@psubs.org><BR> <BR> Sent: Fri, Aug
29, 2014 3:56 pm<BR> <BR> Subject: Re: [PSUBS-MAILIST]
rpm<BR> <BR> <BR> <BR> <BR> <BR>
<BR> <BR> <BR> <BR> Vance,<BR> I did not do an
amp draw test because I do not have the<BR> technology in house. I
<BR> would guess with a 10% rpm drop, there may be a 10% amp<BR>
increase. That would be <BR> to simple :-)<BR> <BR>
Hank<BR> --------------------------------------------<BR> On Fri,
8/29/14, via Personal_Submersibles
<personal_submersibles@psubs.org><BR> <BR> wrote:<BR>
<BR> Subject: Re: [PSUBS-MAILIST] rpm<BR> To:
personal_submersibles@psubs.org<BR> Received: Friday, August 29, 2014,
3:39 PM<BR> <BR> Hank,<BR> Did you check the amperage? I
wonder if the<BR> resistance causes a higher draw, and if so,
how<BR> much?<BR> <BR> Vance<BR> <BR> <BR>
<BR> <BR> <BR> <BR> -----Original<BR>
Message-----<BR> <BR> From: hank pronk via
Personal_Submersibles<BR>
<personal_submersibles@psubs.org><BR> <BR> To:
personal_submersibles<BR>
<personal_submersibles@psubs.org><BR> <BR> Sent: Fri, Aug
29, 2014 3:33 pm<BR> <BR> Subject: [PSUBS-MAILIST] rpm<BR>
<BR> <BR> <BR> <BR> <BR> <BR> <BR>
<BR> <BR> I am working on a hydraulic<BR> pump that will be
external and pressure compensated <BR> in oil. I am using a
trolling motor to drive<BR>the pump. A<BR> while back there was
<BR> a question about rpm drop when a trolling motor
is<BR>filled<BR> with oil. I bench <BR> tested that today,
and the motor runs at 2,000rpm<BR>stock and<BR> 1,800 rpm full of
<BR> WD40.<BR> Hank<BR>
_______________________________________________<BR>
Personal_Submersibles mailing list<BR>
Personal_Submersibles@psubs.org<BR>
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles<BR>
<BR> <BR> <BR> <BR> <BR> <BR>
<BR> <BR> <BR> -----Inline Attachment Follows-----<BR>
<BR> _______________________________________________<BR>
Personal_Submersibles mailing list<BR>
Personal_Submersibles@psubs.org<BR>
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles<BR>
<BR> _______________________________________________<BR>
Personal_Submersibles mailing list<BR>
Personal_Submersibles@psubs.org<BR>
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles<BR>
<BR> <BR> <BR> <BR> <BR> <BR> <BR>
<BR> <BR> -----Inline Attachment Follows-----<BR> <BR>
_______________________________________________<BR>
Personal_Submersibles mailing list<BR>
Personal_Submersibles@psubs.org<BR>
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles<BR>
<BR>_______________________________________________<BR>Personal_Submersibles
mailing
list<BR>Personal_Submersibles@psubs.org<BR>http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles<BR><BR><BR>_______________________________________________<BR>Personal_Submersibles
mailing
list<BR>Personal_Submersibles@psubs.org<BR>http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles<BR><BR><BR>_______________________________________________<BR>Personal_Submersibles
mailing
list<BR>Personal_Submersibles@psubs.org<BR>http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</FONT></BLOCKQUOTE></DIV></FONT></BODY></HTML>