[PSUBS-MAILIST] (no subject)

Thu Oct 30 05:26:22 EDT 2014

Hi Tim,I am trying to make up my own brushless thruster.About 90% of the thruster manufacturers use brushless motors,however the cheapest price I've found is about $3,500 for thrusterkort nozzle & controller. This seems axcessive as I can buy a 1500Wbrushless motor & controller for round $100-. It's just a matter of tracking down the right motor. I am trying to find something around 1500W but with revs of less than3000 rpm. Adding a gear box to get the propeller shaft revs down is an option Iam hoping to avoid.Also the voltage needs to be up near 48V to reduce the amps. There seems to be a problem getting hold of ready made electrial penetraters suitable for high amps.Cheers Alan
      From: T Novak via Pers-onal_Submersibles <personal_submersibles at psubs.org>
 To: 'Personal Submersibles General Discussion' <personal_submersibles at psubs.org> 
 Sent: Thursday, October 30, 2014 2:46 PM
 Subject: Re: [PSUBS-MAILIST] (no subject)

#yiv0660100292 #yiv0660100292 -- _filtered #yiv0660100292 {font-family:Helvetica;panose-1:2 11 6 4 2 2 2 2 2 4;} _filtered #yiv0660100292 {panose-1:2 4 5 3 5 4 6 3 2 4;} _filtered #yiv0660100292 {font-family:Calibri;panose-1:2 15 5 2 2 2 4 3 2 4;}#yiv0660100292 #yiv0660100292 p.yiv0660100292MsoNormal, #yiv0660100292 li.yiv0660100292MsoNormal, #yiv0660100292 div.yiv0660100292MsoNormal {margin:0cm;margin-bottom:.0001pt;font-size:12.0pt;}#yiv0660100292 a:link, #yiv0660100292 span.yiv0660100292MsoHyperlink {color:blue;text-decoration:underline;}#yiv0660100292 a:visited, #yiv0660100292 span.yiv0660100292MsoHyperlinkFollowed {color:purple;text-decoration:underline;}#yiv0660100292 span.yiv0660100292EmailStyle17 {color:#1F497D;}#yiv0660100292 .yiv0660100292MsoChpDefault {font-size:10.0pt;} _filtered #yiv0660100292 {margin:72.0pt 72.0pt 72.0pt 72.0pt;}#yiv0660100292 div.yiv0660100292WordSection1 {}#yiv0660100292 Alan,  Any luck with marine bow thrusters?  They are around 1500 watts, 12 volts, and come in a sealed, but not pressurized, housing.  Tim  

From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of Alan James via Personal_Submersibles
Sent: October-27-14 9:36 PM
To: Personal Submersibles General Discussion
Subject: Re: [PSUBS-MAILIST] (no subject)  Ken,haven't heard from you for a while.I am trying to track down a suitable DC brushless motor around 1500W for a thruster.Preferably I don't want to gear it down, so I need an output speed of less than 3000rpm.The only brushless motors I can find with low rpm  are the RC outrunner motors thatyou might find at Hobby King. I am looking at playing round with a larger motor &running it at 1/2 it's maximum voltage. They seem so small compared to their brushedcounterpart that I don't think I will be disadvantaged size wise by doing this.Most of these motors seem to be low voltage, high amps, & I would prefer something operatingon around 48V. Any words of wisdom or product recommendation here thanks.Alan  From: Ken Martindale via Personal_Submersibles <personal_submersibles at psubs.org>
To: 'Personal Submersibles General Discussion' <personal_submersibles at psubs.org> 
Sent: Monday, October 27, 2014 1:20 PM
Subject: Re: [PSUBS-MAILIST] (no subject)
Water is compressible, look how the submarine "Ben Franklin" did it. Water
is just not very compressible.

Ken Martindale

-----Original Message-----
From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org]
On Behalf Of Marc de Piolenc via Personal_Submersibles
Sent: Sunday, October 26, 2014 8:11 PM
To: personal_submersibles at psubs.org
Subject: Re: [PSUBS-MAILIST] (no subject)

Compressing water will be quite some trick.

Marc

Ducted fans: http://massflow.archivale.com/ Archivale catalog:
http://www.archivale.com/catalog Polymath weblog:
http://www.archivale.com/weblog Translations (ProZ profile):
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Translations (BeWords profile): http://www.bewords.com/Marc-dePiolenc

On 10/26/2014 11:06 PM, Graham Bayliss via Personal_Submersibles wrote:
>
> Hi Hank
>
> I agree a jet drive is the way to go did you not think that a jet ski 
> drive was to small and would only drive a small craft. I intend to 
> build a larger jet drive and compress the water. This will be easy and 
> add power to the system the jet drive from a jet ski would not drive a 
> sub but I am certain I can overcome the problems by building a larger jet
drive and a compressor.
> Thank you for your input and I will keep you informed as the project 
> un folds.
>
> Graham
>
> -----Original Message-----
> From: Personal_Submersibles 
> [mailto:personal_submersibles-bounces at psubs.org]
> On Behalf Of hank pronk via Personal_Submersibles
> Sent: 26 October 2014 12:42
> To: Personal Submersibles General Discussion
> Subject: Re: [PSUBS-MAILIST] (no subject)
>
>
> Graham,
> In the world of marine jet drive it is well known that jet drive takes 
> two times the horse power to do the same job.  Jet drive is well 
> suited to a craft that needs a shallow draft.  I think you will find 
> it very complicated to control and it will be very inefficient. I have 
> been down this road, I love the concept but abandoned it.  If you go 
> forward may I suggest you start with a jet drive.  It is not a simple 
> part to replicate.  The impeller tolerances are critical.  I have a 
> jet unit on the shelf I could donate to your project.  The jet is from 
> a jet ski. I would consider a single rear motor on a full gimbal.
> Hank --------------------------------------------
> On Sun, 10/26/14, Graham Bayliss via Personal_Submersibles 
> <personal_submersibles at psubs.org> wrote:
>
>  Subject: [PSUBS-MAILIST] (no subject)
>  To: "'Personal Submersibles General Discussion'"
> <personal_submersibles at psubs.org>
>  Received: Sunday, October 26, 2014, 7:39 AM
>
>  #yiv9417249292
>  #yiv9417249292 --
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>  #yiv9417249292  Hi  I am near the end of my build  of my k350 and have
> started to look at new designs I am  interested in building a flyer 
> sub and have come up with a  design which will include a vectored 
> motor drive this will  enable my flyer to hover and stop where ever I 
> want. I have  designed a motor unit which will drive a fan type 
> propeller  as an intake this will force water to the rear of the unit
>    where it is compressed  then it is forced into ducting  which will 
> take the water to four nozzles on the side of  the craft. The nozzles 
> are able to turn three hundred and  sixty degrees  both side are 
> independent of one another so  rolls will be achievable. The reason 
> for a vectored motor is you only need one motor source and one power 
> pack this will  ease the maintenance and increase the enjoyment of 
> using  your sub. I am interested in the clubs thought of this kind  of 
> design.  Graham
>

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