[PSUBS-MAILIST] Thruster Test Jig

[Alan via Personal_Submersibles]

Thanks Cliff,
I couldn't download the zip but you have given me some ideas from
what you have said. 
I might just put a removable pin in & remove the vertical section to change
the propellers. Most of the propellers have different shaft sizes so will
probably take the vertical unit back to the workshop to remove press fitted
sleeves.
The extension ladder can be retracted back to get at the test unit.
Have a 48V rectifier so can keep this running day & night. 
I am initially testing the small 6374 60kv brushless motors as I had some good 
results previously. Steve from Australia is playing around with the same motor
& Vesc motor controller. You can supposedly extract the rpm, amp draw, Voltage
& motor temperature from the esc, & I have a guy working on that.
The main thing I am looking at is getting good efficiency with this small direct
drive thruster, & avoiding a gear box. 
Will keep you up with the play.
Cheers Alan

Sent from my iPad

> On 16/05/2018, at 1:29 AM, Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Alan, I sent you a compressed file to your private email address. 
> 
> Basics of the tester was a hinged boom that lowers the thruster into the pool.  The bollard thrust was measured with a load cell.  Thruster speed was measured with a mag pick up on a shaft and a frequency input module in PLC.  PLC was used to take measured analog signals and data logging.  Touchscreen HMI was used to control and display results.  System used three 100 Ah batteries connected in series to drive thruster.  Also measured the current and voltage on thurster.  Included a power point file of a psub presentation I did on the test a while back. 
> 
> I am interested in the results you get from your thruster.  Keep us in abreast of testing progress.
> 
> Regards
> 
> Cliff
> 
>> On Tue, May 15, 2018 at 12:16 AM, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> Cliff,
>> you don't have the plans or pictures of your thruster testing
>> set up do you?
>> I have just bought an extension ladder to extend my thruster
>> testing jig out in to the pool further to eliminate the backwash off the side,
>> & am wanting to make the jig a bit more professionally than last time. 
>> Have a bit of an idea of how I'm building it but may gain some 
>> ideas from how you did it. 
>> BTW just ordered the aluminium version of your parker relieving regulator
>> as it was a few hundred dollars cheaper than what I could buy the 316. 
>> Will pull it apart & look at anodising it.
>> Cheers Alan
>> 
>> 
>> Sent from my iPad
>> 
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