[PSUBS-MAILIST] Brushless Thrusters

Sun Sep 7 13:01:36 EDT 2014

Alan,

You could take the thrust issue out of the system entirely by the addition of your thrust bearings in the seal package. Use a flexible coupling between inner shaft stub and gear or motor output, then all you have to plan for is torque.

Vance

-----Original Message-----
From: Alan via Personal_Submersibles <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Sent: Sun, Sep 7, 2014 12:04 pm
Subject: Re: [PSUBS-MAILIST] Brushless Thrusters

Thanks Hank,
in hindsight, the thrust bearing would have to be in the planetary gearbox.
This may simplify things as I could possibly mount a gearbox with thrust bearing on to
any suitable motor.  
Alan
Sent from my iPad

On 7/09/2014, at 9:07 pm, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Alan
When I upgraded the cartridge seal in Gamma, I needed a pretty Beafy thrust bearing, it was no problem to get.  have since changer to Magnetic.   I think you could replace the bushing in a thruster with a ball bearing and never look back.  
Hank

                                                            From:                                                        Alan via Personal_Submersibles <personal_submersibles at psubs.org>; with 
                                                            To:                                                        Personal Submersibles General Discussion <personal_submersibles at psubs.org>;                                                                             
                                                            Subject:                                                        Re: [PSUBS-MAILIST] Brushless Thrusters                            
                                                            Sent:                                                        Sun, Sep 7, 2014 1:43:49 PM                            

Hi Hank,
the kort nozzle on the Indonesian thruster looks a bit Naff. 
( I am designing an art work here.)
I could get a price for the unit without kort nozzle, but
I'm wondering if I could build something for 1/2 that price.
There are some reasonably priced brushless motors about.
I don't know that I could just retro fit a thrust bearing inside the can of the motor.
I tried to put a thrust bearing for reverse inside my brushed thrusters, but
couldn't find one with a thin enough section to fit.
Also the motors are a bit expensive to just buy & hope you can fit one.
How did you fit the thrust bearing on Gamma?  Did the propellor shaft extend out the back
of the motor?
Alan

Sent from my iPad

On 7/09/2014, at 7:22 pm, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Allan
Dont worry about thrust bearings to much.  They are aesy to get, I bought one for Gamma , real heavy duty for 80 dollars.  Personally I would just use a good quality bearing and replace it once a year for 8 bucks, if it is a small thruster.   Are you not happy with the  Indonesia thrusters?  Or to pricey?
Hank

                                                            From:                                                        Alan via Personal_Submersibles <personal_submersibles at psubs.org>;                            
                                                            To:                                                        Personal Submersibles General Discussion <personal_submersibles at psubs.org>;                                                                             
                                                            Subject:                                                        [PSUBS-MAILIST] Brushless Thrusters                            
                                                            Sent:                                                        Sun, Sep 7, 2014 11:58:56 AM                            

Hi people,
I've spent several hours today looking at brushless thrusters & wonder if anyone else has looked at them or got any ideas. There is the Indonesian thruster I posted a few weeks back at US 2,200. There is also the Haswing Protruar 2hp that Emile has; however they state that it's for fresh water only, & I think Emile said it was a bit noisy.
The inrunner motors that have the winding on the outside, seem a good option as they cool through convection to the can. They also need higher revs for torque & require a planetary gear box or similar. ( which a lot have built in)
   I was looking at the option of making my own thruster, however the motor would require a thrust bearing & I don't
know of any that would have one other than maybe a high powered battery operated drill.
Any thoughts, suggestions thanks.
Alan

Sent from my iPad
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