[PSUBS-MAILIST] Brushless Thrusters

[Alan via Personal_Submersibles]

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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