[PSUBS-MAILIST] Brushless Thrusters

Sun Sep 7 16:42:44 EDT 2014

Brian,
You can use a simple mechanical seal, that is what the K subs have. An 891 Chesterton mechanical seal is good fo 600 psi, that is what Gamma had when I got it.  You can buy them on ebay for 100 bucks.  Build the shaft to fit the seal, and your sailing.
Hank--------------------------------------------
On Sun, 9/7/14, Brian Cox 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: Sunday, September 7, 2014, 4:29 PM

 I
 talked to a hydraulics guy a few days ago about making a
 seal for my motor pod.  I told him I had a high pressure
 tank that I wanted to turn a shaft inside the tank to stir
 the contents at 250 psi,  ( didn't want his eyes to
 glaze over if I mentioned submarine !)  Anyway he directed
 me to a system using a bronze fitting that would tighten
 down these rings he called "cheverons"  they are
 mating rings of a very high durometer .  the bronze is for
 mating with stainless .  I would have to machine an
 assembly for this , but once I have my shaft size (1 inch
 most likely) I will be able to size everything
 accordingly. Brian 

 ---
 personal_submersibles at psubs.org wrote:

 From: hank pronk via Personal_Submersibles
 <personal_submersibles at psubs.org>
 To:
 personal_submersibles at psubs.org
 Subject: Re:
 [PSUBS-MAILIST] Brushless Thrusters
 Date:
 Sun, 7 Sep 2014 07:07:20 -0700

 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>;                    

                                 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, 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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