[PSUBS-MAILIST] (no subject)
Graham Bayliss via Personal_Submersibles
personal_submersibles at psubs.org
Thu Oct 30 06:26:25 EDT 2014
Hi
I had a problem geting a penetrator to take my thirty six volt cabling I asked for a quote for cable which was 175 amps rated and got a reply of over two thousand pounds in the end I made my own by buying a stainless flexible pipe and threaded the cable through this worked and my motor runs fine. I am using a LMC motor rated for 12 to 72 volts this is a small compact motor which produces a lot of power.
Re4gards
Graham
From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of Alan James via Personal_Submersibles
Sent: 30 October 2014 09:26
To: Personal Submersibles General Discussion
Subject: Re: [PSUBS-MAILIST] (no subject)
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 thruster
kort nozzle & controller. This seems axcessive as I can buy a 1500W
brushless 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 than
3000 rpm. Adding a gear box to get the propeller shaft revs down is an option I
am 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)
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 that
you 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 brushed
counterpart 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 operating
on 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/ <http://massflow.archivale.com/> Archivale catalog:
http://www.archivale.com/catalog <http://www.archivale.com/catalog> Polymath weblog:
http://www.archivale.com/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
> #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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