Re: [PSUBS-MAILIST] Pressure compensation

[TeslaTony@aol.com]

In a message dated 8/11/00 9:23:43 PM Pacific Daylight Time, 
protek@shreve.net writes:

> Jon,
>       You're right in that the mentioned method is a much better way of 
>  compensating.  I wonder if anyone has ever been successful at using a low 
>  viscosity oil in a trolling motor.  It would be an interesting experiment 
>  in the direction of a low cost compensated thruster.  It almost makes me 
>  want to go get a trolling motor and experiment.  I wonder if the armature 
>  would have too much drag against the oil and how much power you would 
loose 
>  in the process.  I would think that cooling would not be a big problem.  I 
>  would suspect that real thrusters for submersibles that are compensated in 
>  this way have special armatures.  Probably the same oil used in 
submersible 
>  pump applications would work.
>  
>  GB
A good oil would be that oil that is used to lube guns and sewing machines, 
it has a pretty low viscosity, lubes all the moving parts, fairly easy to get 
(I dare you to find a hardware store that doesn't carry the stuff) and should 
seal anything that arcs to prevent shorts. The biggest drawback would be the 
quantities that you could buy it in since the biggest I have seen has been 4 
oz. (although you probably could get bigger).

Anthony