[PSUBS-MAILIST] Brushless Thruster

[Alan via Personal_Submersibles]

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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