[PSUBS-MAILIST] Air compensating thrusters

Sun Jul 27 17:08:18 EDT 2014

All,

I was using 3 CSt. Viscisity silicone oil. Works but dissolves only silicone
parts. The stern thruster , which is used for surface cruising, is air
compensated. Works now fine . The plumping is done in a way that eventual
water in the thruster is expelled trough the 2nd stage while ascending.

Now using side thrusters(for 80 operating hours)  Rotoque hubless thrusters
which doesn't need compensation.

Regards, Emile van Essen

Ps. For the Euro subbers; I have 2 new Rhino VX80 ( 24 VDC 38 Kgf) in
surplus. 

They are dismantled and already provided with 18"bsp thread for air /oil
compensation.

The can go for half new price . If someone interested, pleas contact
offlist.

  _____  

Van: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org]
Namens Alec Smyth via Personal_Submersibles
Verzonden: zondag 27 juli 2014 16:17
Aan: Personal Submersibles General Discussion
Onderwerp: Re: [PSUBS-MAILIST] Air compensating thrusters

Yes. It is extremely low viscosity and before using it, I left snips of the
motor's cables in a little jar of it for some months to make sure the
insulation was not affected.

Thanks,

Alec

On Sun, Jul 27, 2014 at 9:49 AM, Jon Wallace via Personal_Submersibles
<personal_submersibles at psubs.org> wrote:

Alec, just for completeness, what oil do you use in your MK's?  Is it marvel
mystery oil?

Jon

On 7/26/2014 10:43 PM, Private via Personal_Submersibles wrote:

Alan, honestly you're over-analyzing this one. I would summarize it thus;
air and oil compensation both work just fine, pick either one.

I've run Snoopy with both air and oil compensation, using the same motors. I
could not tell the difference, either in power or even in sound. I do agree
the motors must in theory lose some efficiency with oil, but it was not in
the least noticeable to me. 

Personally I prefer oil because the system has no moving parts and therefore
in my book is simpler and more reliable, but again... both work just fine. 

As for all the stuff about dissolving plastics and brushes, I finally
overhauled the thrusters last year for the first time. All I had to do was
change the seals and brushes, and I  turned the commutator on the lathe
because the copper had some wear. These parts had lasted a decade. 

Best,

Alec 

_______________________________________________
Personal_Submersibles mailing list
Personal_Submersibles at psubs.org
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/20140727/2e7f311e/attachment-0001.html>