[PSUBS-MAILIST] Brushless Thrusters

Tue Sep 9 00:56:11 EDT 2014

Alan,
I am wondering why your so interested in brushless motors.  What am I missing, also there has been discussions about heat, what heat?  A motor in water, what could be better :-)  After a 3km run in gamma, my motor is maybe Luke warm at best.  
Hank  --------------------------------------------
On Tue, 9/9/14, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Subject: Re: [PSUBS-MAILIST] Brushless Thrusters
 To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
 Received: Tuesday, September 9, 2014, 12:35 AM

 Update,Am still Googling away
 in pursuit of a home made brushless thruster.I am set on using an in-runner motor as they have
 the coils on the outside & will be ableto transfer heat through the can.The problem with in-runners is they have higher
 revs than out-runners, however either will require a planetary gearbox. I am looking at
 reducing the revs down to below 3000 rpm. This is based on other brushless thrusters I have
 looked at but might not be right ( any
 recommendations)?Another problem is that
 most seem to draw huge amps.Here is a
 1200W motor for $30-. Of course there is the price of the
 controller & planetary gear that are
 needed.http://www.hobbyking.co.uk/mobile/viewproduct.asp?idproduct=17720&type=&idparentcat=364Most of the suitable motors seem to be found at
 places like Hobby King, and are used on RC trucks, or found
 on E bike sights. The aircraft motors aren't as
 robust.These motors are tiny, but
 hugely powerful, so there is the potential to make a small
 streamlinedpowerful unit.I haven't had much luck with a matching
 gearbox. Some of the planetary gearboxes recommendoiling (no good to me unless I oil compensate)
 while others don't. I am looking for a cylindrical unit
 to match my motor, preferably with thrust
 bearings.If anyones got any advice or
 experience in this realm I'd be pleased to hear
 it.Regards Alan

 Sent from
 my iPad
 On
 7/09/2014, at 8:43 pm, Alan via Personal_Submersibles <personal_submersibles at psubs.org>
 wrote:

 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, butI'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,
 butcouldn'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 backof
 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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