[PSUBS-MAILIST] Brushless Thruster

[Alec Smyth via Personal_Submersibles]

Hi Alan,

Parker sells some little metal sleeves that stretch onto the shaft and are
ground to the ideal finish for lip seals. It's a really easy way to meet
the surface finish requirement, and they're super cheap too.


Best,

Alec

On Mon, Oct 3, 2016 at 3:26 PM, Alan via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Hank,
> yes I like the idea of going straight to the penetrator with the clear
> tube attaching
> on to a barbed fitting. I want to put a 4psi overpressure in the system &
> are
> intending to do this with compressed air; so need to tee in an air line. I
> also
> need an oil filling point, however the air connection point could double
> for this.
> I like the clear tube as it is a visual indication of the oil level.
> I have 2 lip seals at the moment. Hugh wasn't too impressed with that idea
> & thought I should go with a mechanical seal. From what I have read, the
> shaft
> the lip seal runs on needs to be plunge ground to a certain finish, & a
> mechanical
> seal would eliminate that precision process.
> Also I look at what other large manufacturers have done & figure they have
> done the research on seals & have the experience.
> Cheers Alan
>
> Sent from my iPad
>
> On 4/10/2016, at 12:37 am, hank pronk via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Alan,
> You can make up a pretty simple penetrator for the wires, or why not leave
> the wires the way they are in the clear tube and run the tube to a
> penetrator on the sub that is made from a barbed fitting.  The clear tube
> can be oil filled and act as your compensator.  I know you already though
> of this.  I think the DW's work like that.
> If you are oil filled, why the mechanical seal.  Just go with a higher
> pressure rated lip seal.
> Hank
>
>
> On Monday, October 3, 2016 3:40 AM, Alan via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>
> Hi Hank, thanks.
> yes am intending on getting that type of seal, but I will try & get some
> advice
> on an appropriate seal for the viscosity & type of oil I am using (Morlina
> S2 Bl 10).
> Must be a bit barmy because I was getting quite excited about the new
> compensating oil I bought.
> I haven't quite decided how I am going to terminate the wires coming out
> of the
> motor. At present I have the wires running through a clear hose up to a
> manifold.
> I say manifold but it is a modified brass T plumbing fitting. The hose is
> hose clamped
> to one end & the wires are silicone sealed coming out the other end. On
> the T I have
> a plug that I can remove to fill the tube & thruster with oil. This is
> okay for experimental
> purposes but will need to add pressure to the system & a through hull
> fitting
> when I mount it on the sub.
> Alan
>
>
> Sent from my iPad
>
> On 3/10/2016, at 9:28 pm, hank pronk via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Alan,
> That is great! well done..  What type of mechanical seal will you use?
> Are you planning a spring loaded pump seal?
> Hank
>
>
> On Monday, October 3, 2016 2:07 AM, Alan via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>
> Just did a pool test of my latest brushless thruster.
> This thruster uses a 60kv (revs per Volt) 6374 (dimensions in mm) brushless
> sensored outrunner motor. The propeller was a 3 bladed 7&1/4" x 4" with no
> kort nozzle.
> I was getting 30kg (66lb) thrust from 30 amps off 52 volts (1560W) with
> the thruster
> oil filled. This seems comparable to what Cliff was getting from his
> Minnkota 101.
> The difference is this is a much smaller unit. I have been keeping a file
> on
> performance statistics of commercial thrusters & trolling motors & this is
> slightly
> above average.
> The manufacturer told me not to run the motor more than 40 amps
> continuosly,
> so I am being conservative with the 30 amp draw. I could bump it up by
> putting
> on a bigger prop.
> Next step is to use it as a boat motor & notch up 100 or so hours, then
> build
> another housing with a mechanical seal.
> Added a couple of photos to the project page, but they loaded upside down
> for
> some reason. Couldn't change them.
> http://www.psubs.org/projects/1235435392/brushlessthruster/
> Alan
>
> Sent from my iPad
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