[PSUBS-MAILIST] MK-101 Connectors

Sun Jul 27 19:39:30 EDT 2014

And what is the cost?
Vance

-----Original Message-----
From: Hugh Fulton via Personal_Submersibles <personal_submersibles at psubs.org>
To: 'Personal Submersibles General Discussion' <personal_submersibles at psubs.org>
Sent: Sun, Jul 27, 2014 7:22 pm
Subject: Re: [PSUBS-MAILIST] MK-101 Connectors

Those Rotorque units look great and seem like the answer to my prayers but the power for 40 kg thrust appears a little high.  However, Emile says that they outperform the previous thrusters so are they being over conservative??
What are the MK-101’s  figures like compared with Emile’s thrusters.  What do each actually draw current wise at full chat?  
Hugh

From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of Clifford Redus via Personal_Submersibles
Sent: Monday, 28 July 2014 10:01 a.m.
To: Personal Submersibles General Discussion
Subject: Re: [PSUBS-MAILIST] MK-101 Connectors

Since so many of us are using or planning on using MK-101s either air or oil compensated, it would be nice if we could move towards a standard connector.  These thrusters are 36v with max current of 46 amps.  The lower unit comes with two 10 AWG wires.

It would be nice if the connector was a male bulk head connector with two power pins and one alignment pin.  

Could go with an off the shelf connector like an impulse HDBH-2-MP but these are expensive as rated for depth.  In our case since we are pressure compensating this is overkill. 

For those of you that have MK-101 or MK-80 thrusters, what type of connectors are you using?

Like Vance, I am planning to have a spare that could be swapped out in the field.

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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