[PSUBS-MAILIST] Air compensating thrusters

Sun Jul 27 17:20:45 EDT 2014

Emile.  Can you send link on Rotoque hubless thrusters ?  

Cliff

> On Jul 28, 2014, at 5:08 AM, Emile van Essen via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 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
>  
> 
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>  
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