[PSUBS-MAILIST] (no subject)

Tue Oct 28 00:35:53 EDT 2014

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):
http://www.proz.com/profile/639380
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
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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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