[PSUBS-MAILIST] Compensating oil

Tue Dec 15 11:13:58 EST 2015

I met up with the guy who owns\operates the Mortze submersible  Russian
made.  He told me that it runs completely on hydraulic motors and he has
hardly had to service anything for 20 years...  I could ask him about them
if anyone likes?
REgards
James

On 13 December 2015 at 01:38, T Novak via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Good plan, Alan.
>
> Getting tougher for me, the boys all have all the dive gear they need.
> What else is there?
>
> Tim
>
>
>
> *From:* Personal_Submersibles [mailto:
> personal_submersibles-bounces at psubs.org] *On Behalf Of *Alan James via
> Personal_Submersibles
> *Sent:* December-12-15 1:57 PM
>
> *To:* Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> *Subject:* Re: [PSUBS-MAILIST] Compensating oil
>
>
>
> Thanks Hank,
>
> & Tim, I have a tradition of shopping on the 24th of Dec along
>
> with all the other dysfunctional males.
>
> Alan
>
>
> ------------------------------
>
> *From:* hank pronk via Personal_Submersibles <
> personal_submersibles at psubs.org>
> *To:* Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> *Sent:* Sunday, December 13, 2015 7:37 AM
> *Subject:* Re: [PSUBS-MAILIST] Compensating oil
>
>
>
> Tim,
>
>  my x mas shopping is done, it is sitting in my shop :-)
>
> Hank
>
>
>
>
>
>
>
>
>
> On Saturday, December 12, 2015 11:16 AM, T Novak via Personal_Submersibles
> <personal_submersibles at psubs.org> wrote:
>
>
>
> Hank, Alan
>
> My personal favourite way to reverse the thrust is by rotating the
> motor-prop pod assembly 180 degrees.  Doesn't require a  sophisticated
> controller, but it does complicate the mechanical link.
>
> Great link on submersible pumps, Alan.
>
> What are you guys doing on psubs, shouldn't you be out Christmas shopping?
>
> Tim
>
>
>
> *From:* Personal_Submersibles [
> mailto:personal_submersibles-bounces at psubs.org
> <personal_submersibles-bounces at psubs.org>] *On Behalf Of *hank pronk via
> Personal_Submersibles
> *Sent:* December-12-15 7:51 AM
> *To:* Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> *Subject:* Re: [PSUBS-MAILIST] Compensating oil
>
>
>
> Alan,
>
> No clue on brand, there is substantial  thrust protection because the
> motor sits vertical and the weight of the armature is always on the thrust
> mechanism.   If I recall, they have bushings not bearings.  If you can add
> reverse and speed control, you have a winner.  I just have no expertise in
> that area.
>
> Hank
>
>
>
>
>
> On Saturday, December 12, 2015 8:22 AM, Alan via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>
>
> It should be relatively easy to add reverse, but
>
> I presume they are either on or off, so you would need the addition of
>
> a speed controller anyway. It would be interesting to pull one apart.
>
> There might not be much in the way of a thrust bearing, as the pump
> impeller
>
> wouldn't have an axial load on the shaft like a propeller.
>
> What brand was it again?
>
> Alan
>
>
>
>
>
> Sent from my iPad
>
>
> On 13/12/2015, at 2:35 am, hank pronk via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Alan,
>
> I am still in favour of pump motors except I do not know how to reverse
> them.  As far as I can tell they are not reversible.  The efficiency in oil
> comes from the extremely smooth interior of the motor.  If you could
> reverse them, they would be perfect, they are cheap at about 200 dollars
> for a small 120v and they would be pretty easily modified to take a prop.
> Oh ya, and they already have  thrust bearings.   The oil inside was real
> stinky, kinda like antifreeze.
>
> Hank
>
>
>
>
>
> On Saturday, December 12, 2015 3:24 AM, Alan James via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>
>
> Hank,
>
> what ever happened to your idea of using a submersible pump as a thruster?
>
> Have just been doing a bit of reading on oil compensation of submersible
> pumps.
>
> In this article....
>
> http://www.pumped101.com/oilvsair.pdf
>
> it states that with oil compensation there is only a loss of about 1&1/2%
> efficiency
>
> over an air compensated motor.....
>
>  "What does reduce an oil filled motor’s efficiency is the energy loss due
> to oil circulation within the stator housing.
>
> As a rule of thumb, this circulation requirement reduces efficiency by
> about 1.5% when compared to an air filled motor. "
>
>    Of interest was that they base this on the use of an oil "Shellflex
> 210" which has a viscosity of 20.3 cst at 40C.
>
> I was recently trying to track down a silicone oil of 3cst thinking that I
> would need a really low viscosity to get reasonable efficiency.
>
> A chemist I spoke to said at that low a viscosity it would be flammable.
>
> Alan
>
>
>
>
>
>
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