[PSUBS-MAILIST] WD - 40

[Alan via Personal_Submersibles]

One problem with air compensation or using really thin oil is it is not
good for the bearings. The thinner the oil the shorter their life.
If the motor is designed for the heat produced with air compensation
 (large windings large motor) then you could get away with it. 
The Minn kota are obviously designed for this.
But if you are taking a golf cart motor that is normally exposed to some air
cooling ( like Brian is doing,) & creating an oven around it, then you may run in
to some problems.
As I have said before, if you grind a piece of steel till it is red hot it will take
several minutes to cool but if you plunge it in water it cools immediately,
hence the huge advantage of oil compensation for cooling.
Extreme heat can demagnetise the magnets & continual overheating will
shorten the life of the windings.
Brian was talking about measuring the heat inside his motor, so I guess he can
plan for either option if the motor gets too hot.
Alan



Sent from my iPad

> On 30/03/2017, at 5:10 AM, emile via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Totally agree with you.
>  
> With clever positioning of the connections and 2nd stage, any (condensated) water will be expelled when ascending.
>  
> BR, Emile
>  
> Van: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] Namens james cottrell via Personal_Submersibles
> Verzonden: woensdag 29 maart 2017 15:01
> Aan: Personal Submersibles General Discussion
> Onderwerp: Re: [PSUBS-MAILIST] WD - 40
>  
> I have to say, I no longer think that WD40 is the best for compensating things underwater. Over time it causes plastics and rubber to harden and become brittle.
> Silicone oil is better but the other problem with oil compensation in general is that the smallest drop/leak makes a very visible oil slick around your sub (not good). Most guys are using trolling motors and they're not really tight enough to hold thin oil without leaks.
> Back in the 90s I was using air compensation- and it actually worked really well. As far as I know, Karl Stanley has also been using air compensation for a long time without problems.
> It's a clean system that's not hard to set up and a small bottle of air lasts for many dives.
>  
> Greg C
>  
>  
> From: "MerlinSub at t-online.de via Personal_Submersibles" <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
> Sent: Tuesday, March 28, 2017 12:55 PM
> Subject: Re: [PSUBS-MAILIST] WD - 40
>  
> On a brushless motor it will maybe work with mineral oil.
> On motors with brushes I have bad expierence with that.
> Mineral oil is a big problem in a lake if a motor is even a little untight.
>  
>  
>  
> -----Original-Nachricht-----
> Betreff: Re: [PSUBS-MAILIST] WD - 40
> Datum: 2017-03-28T17:15:59+0200
> Von: "Brian Cox via Personal_Submersibles" <personal_submersibles at psubs.org>
> An: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
>  
>  
>  
> Hi Carsten, 
>                         I did a small test trying to light the WD40 on fire.  It's not as flammable as I thought it would be.  I think they have improved it's non-flammability with new formulation. It's still somewhat flammable however. 
> I will be using a light mineral oil in my motors.
>  
> Brian
>  
> 
> 
> --- personal_submersibles at psubs.org wrote:
> 
> From: "MerlinSub at t-online.de via Personal_Submersibles" <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] WD - 40
> Date: Tue, 28 Mar 2017 07:22:02 +0200 (MEST)
> 
> Heat Vapor is may a problem with WD40.
> May ensure that the compensating back is big to handle that..
> We change to silicon oil for that reason.
>  
> vbr Carsten
>  
>  
>  
> -----Original-Nachricht-----
> Betreff: [PSUBS-MAILIST] WD - 40
> Datum: 2017-03-28T04:56:46+0200
> Von: "Brian Cox via Personal_Submersibles" <personal_submersibles at psubs.org>
> An: "PSubs" <personal_submersibles at psubs.org>
>  
>  
>  
> I just ran one of my motors filled with the WD40.  It seemed to be very happy.  I mainly just did it to clean the carbon build up out of the motor.  I was surprised how sealed the motor was, it is open at one end where it mates to the gear box.  I was able to fill it up without it leaking out anywhere.  That could be an issue later when I want the mineral oil to fill all the voids.  I might need to actually drill some holes to get some circulation . 
>  
>  
> Brian 
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