[PSUBS-MAILIST] Air compensating thrusters

Sun Jul 27 18:26:14 EDT 2014

Emile,  these thrusters look interesting.  At the link I did not see any specs.  Do you have specs?  

Cliff 

> On Jul 28, 2014, at 5:30 AM, Emile van Essen via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Cliff,
>  
> http://www.rotorque-jet.de/
>  
> best regards, Emile
>  
> Van: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] Namens Clifford Redus via Personal_Submersibles
> Verzonden: zondag 27 juli 2014 23:21
> Aan: Personal Submersibles General Discussion
> Onderwerp: Re: [PSUBS-MAILIST] Air compensating thrusters
>  
> 
> 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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