[PSUBS-MAILIST] Brushless Thruster

Mon Oct 3 21:07:29 EDT 2016

Thanks Alec,
didn't know that product existed. I found this video on an skf sleeve
that is a good demonstration of how they are fitted.
Be good to hear from Emile about his Protruar thruster. I don't know why 
it wasn't working well under the water, as he doesn't go that deep on
his tourist dives.
Alan

Sent from my iPad

> On 4/10/2016, at 12:56 pm, Alec Smyth via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 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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