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<DIV>Brian,</DIV>
<DIV> </DIV>
<DIV>I think the flash point for MMO is only slightly above that for WD-40
which is 122 F. Flash points below 100 F are "flammable" and flash
points from 101 to 200 are "combustible." Proprietary spec sheets
will often say flammable even when in the combustible range. Don't know
why; might have something to do with lawyers.</DIV>
<DIV> </DIV>
<DIV>Veterinary supply stores are the only ones I've found selling
unscented mineral oil in small quantities (1 gallon), and I have no idea of the
viscosity.</DIV>
<DIV> </DIV>
<DIV>I often see a substantial variation in the quoted viscosity of a
product. Again, not sure why. In lubricants the viscosity can double
with as little as a 10 degree F change in temperature. If I were trying to
choose between MMO and a very low viscosity mineral oil, I'd probably test
viscosity of each at 40, 70, and 100 F. Or I'd just ask Alec and go with
his recommendation.</DIV>
<DIV> </DIV>
<DIV>Jim</DIV>
<DIV> </DIV>
<DIV>
<DIV>In a message dated 8/30/2014 3:43:37 P.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>The
marvel mystery oil does have a very low viscosity - 2.6 cSt but that is
probably because it has mineral spirits in it, it is flammable and has a
flashpoint of 160 degrees.<BR><BR>here is a link to the penreco mineral oils,
I use a cosmetic grade mineral oil in my beeswax skin cream (Drake oil #7)
, I buy a drum at a time so I guess I'm sort of partial to it. But
you can get lower viscosity than what I
use.<BR><BR>http://www.penreco.com/images/spec-sheets/White_Oil.pdf<BR><BR>Brian<BR><BR>---
personal_submersibles@psubs.org 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: Sat, 30 Aug 2014 09:49:41 -0700<BR><BR><BR>Jim, Thanks' I was
going to ask what is the preferred oil.<BR>I have been using WD40 for some
time now and found no problems. I did have a clear tube running to a
motor and it hardened. Other than that the motors I have are on
their third sub and still working. I will make the switch to
marvel mystery oil since I am now out of WD40. <BR>Hank
<BR>--------------------------------------------<BR>On Sat, 8/30/14, via
Personal_Submersibles <personal_submersibles@psubs.org>
wrote:<BR><BR>Subject: Re: [PSUBS-MAILIST] rpm<BR>To:
personal_submersibles@psubs.org<BR>Received: Saturday, August 30, 2014, 9:22
AM<BR><BR><BR>Hank,<BR> <BR>I don't know if you will find an oil with
lower<BR>viscosity than WD40. <BR>The problem with WD40 is that it is a
solvent that damages<BR>plastic and rubber <BR>components within the
motor. Alec Smyth did a lot of<BR>testing on various <BR>oils. The
last I knew the medium of choice was Marvel<BR>Mystery Oil. <BR>It's
safe for the seals, etc., and has a lower viscosity<BR>than any straight
<BR>mineral oil.<BR> <BR>For thrusters, comparative amp draw at a given
RPM<BR>(with associated heat <BR>build-up) is probably more significant
than drop in maximum<BR>RPM since we're <BR>not generally operating at
maximum. That might not be true<BR>when you're <BR>using the motor to
operate a pump.<BR> <BR>Jim<BR> <BR><BR>In a message dated 8/30/2014
5:51:09 A.M. Central<BR>Daylight Time, <BR>personal_submersibles@psubs.org
writes:<BR>Brian,<BR>Yes, I have heard others have had good success<BR>with
<BR> different oils. Maybe the rpm drop is less with
other<BR>oils. <BR>
<BR>Hank<BR>--------------------------------------------<BR>On Fri, 8/29/14,
<BR> Brian Cox via
Personal_Submersibles<BR><personal_submersibles@psubs.org>
<BR> wrote:<BR><BR>Subject: Re:<BR>[PSUBS-MAILIST] rpm<BR>To:
"Personal<BR>Submersibles <BR> General
Discussion"<BR><personal_submersibles@psubs.org><BR>Received:
<BR> Friday, August 29, 2014, 11:26 PM<BR><BR>Hank, There is a
very thin <BR> mineral<BR>oil that might be better that the<BR>wd
40<BR><BR>Brian<BR><BR>--- <BR>
personal_submersibles@psubs.org<BR>wrote:<BR><BR>From: hank pronk via
<BR>
Personal_Submersibles<BR><personal_submersibles@psubs.org><BR>To:<BR>Personal
<BR> Submersibles General Discussion <BR>
<personal_submersibles@psubs.org><BR>Subject: Re: [PSUBS-MAILIST]
<BR> rpm<BR>Date: Fri, 29 Aug 2014
13:23:31<BR>-0700<BR><BR>Vance,<BR>Yes for sure, <BR> Gamma has
two separate amp gauges, one for the<BR>motor and one for the rest
<BR> of the sub. All 24v and the<BR>trolling motor<BR>is 12
v<BR>Hank <BR>
<BR>--------------------------------------------<BR>On Fri, 8/29/14, via
<BR> Personal_Submersibles <BR>
<personal_submersibles@psubs.org><BR>wrote:<BR><BR> <BR>Subject:
Re: <BR> [PSUBS-MAILIST] rpm<BR>
To:<BR>personal_submersibles@psubs.org<BR> <BR> Received:
Friday, August 29, 2014, 4:03 PM<BR> <BR> Yeah, <BR>
too<BR> simple. Maybe that's a good<BR>guess, but..... I will
say<BR> <BR> that an ammeter in the boat is a good thing.
You can<BR>keep<BR>an<BR> eye <BR> on things, and if it goes
UP at some stage, you would<BR> suspect a <BR> thruster
issue (a tangle, or a bearing failure<BR>or<BR> whatever). All
<BR> it takes is an appropriate shunt and a<BR>gauge<BR> (in
my pre-digital <BR> steampunk mind). Okay, thanks anyway.
I<BR> <BR>was curious, that's <BR> all.<BR>
Vance<BR> <BR> <BR> <BR> <BR> <BR>
<BR> <BR> -----Original<BR> Message-----<BR>
<BR> <BR> From: hank pronk
via<BR>Personal_Submersibles<BR> <BR>
<personal_submersibles@psubs.org><BR> <BR><BR> To: Personal
<BR> Submersibles General Discussion<BR> <BR>
<personal_submersibles@psubs.org><BR> <BR><BR> Sent: Fri, Aug
<BR> 29, 2014 3:56 pm<BR> <BR> <BR>Subject: Re:
[PSUBS-MAILIST] <BR> rpm<BR> <BR> <BR>
<BR> <BR> <BR> <BR> <BR> <BR>
<BR> <BR> Vance,<BR> I did not do an <BR> amp
draw test because I do not have the<BR> <BR>technology in house. I
<BR> <BR> would guess with a 10% rpm drop, there<BR>may be a
10% amp<BR> <BR> increase. That would be <BR> to
simple<BR>:-)<BR> <BR> <BR>
Hank<BR> <BR>--------------------------------------------<BR> On
Fri, <BR> 8/29/14, via Personal_Submersibles <BR>
<personal_submersibles@psubs.org><BR> <BR><BR>
wrote:<BR> <BR> <BR> Subject: Re: [PSUBS-MAILIST]
rpm<BR> To: <BR>
personal_submersibles@psubs.org<BR> <BR>Received: Friday, August 29,
2014, <BR> 3:39 PM<BR> <BR> Hank,<BR> Did you
check the amperage? I <BR> wonder if the<BR> resistance
causes a<BR>higher draw, and if so, <BR> how<BR>
much?<BR> <BR> Vance<BR> <BR> <BR><BR>
<BR> <BR> <BR> <BR> <BR>
-----Original<BR> <BR> Message-----<BR> <BR>
From:<BR>hank pronk via <BR> Personal_Submersibles<BR>
<BR>
<personal_submersibles@psubs.org><BR> <BR><BR> To:
<BR> personal_submersibles<BR> <BR>
<personal_submersibles@psubs.org><BR> <BR><BR> Sent: Fri, Aug
<BR> 29, 2014 3:33 pm<BR> <BR> <BR>Subject:
[PSUBS-MAILIST] rpm<BR> <BR> <BR> <BR>
<BR> <BR> <BR> <BR> <BR> <BR>
<BR> <BR> I am working on a<BR>hydraulic<BR> pump that will
be <BR> external and pressure compensated <BR>
in<BR>oil. I am using a <BR> trolling motor to drive<BR>the
pump. A<BR> while back there was <BR> <BR> a
question about rpm drop when a<BR>trolling motor <BR>
is<BR>filled<BR> with oil. I<BR>bench <BR> tested that
today, <BR> and the motor runs at
2,000rpm<BR>stock<BR>and<BR> 1,800 rpm full of <BR>
<BR> WD40.<BR> Hank<BR> <BR>
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