[PSUBS-MAILIST] Group Help Request

Mon Oct 28 10:12:13 EDT 2013

My brother is a wizard on the wood lathe. I'm sure he could come up with a hardwood plug in pretty much no time, once the shape and overall dimensions are finalized. Then seal the wood with something, spray on mold release, and lay on the fiberglass. It would be cheap and provide at least a beginning to test the nozzle shape and prop.
Vance

-----Original Message-----
From: Alan <alanlindsayjames at yahoo.com>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Sent: Mon, Oct 28, 2013 9:57 am
Subject: Re: [PSUBS-MAILIST] Group Help Request

Joe,
>From what I've seen, $2-3 per cubic inch is a good price for 3d printing.
So a kort nozzle would be quite expensive.
You could prototype 1 & form a mold from it.
Under ambient in the psubs project section, I have a photo of my kort
nozzle in process. I incorporated a sleeve to slide the motor in to.
However, as said, to mold this you would need to do it in 2 sections.
Alan

Sent from my iPad

On 29/10/2013, at 2:39 AM, jimtoddpsub at aol.com wrote:

Joe,

Another company that will give you quick quotes on printing a 3D object in a variety of materials is www.shapeways.com.  

The Kort nozzle (the ring itself) doesn't necessarily have to be printed in one piece; it could be printed in two or three segments of the circle and joined together.  What material do you plan to use for the supports, and how do you plan to attach them to the motor housing?  The nozzle and the supports don't have to be of the same material, and printing the nozzle doesn't mean you have to print the supports.  Lots of options to consider.

There are services around such as www.lazerdesign.com  that can do a 3D scan on an existing object and save a lot of CAD work.  You can also find desktop 3D scanners for sale such as www.makerbot.com/Digitizer.

Just for fun, take a look at Nuytco's MK-2 thruster:  http://nuytco.com/products/nmt12-mk2-thruster/

Have fun,
Jim

-----Original Message-----
From: Joe Perkel <josephperkel at yahoo.com>
To: personal_submersibles <personal_submersibles at psubs.org>
Sent: Mon, Oct 28, 2013 6:42 am
Subject: Re: [PSUBS-MAILIST] Group Help Request

I just love the world in which we live! Look what I found while waiting to take my daughter to school,..  http://www.quickparts.com/QuickQuote.aspx

Isn't that just the coolest thing! The Star Trek synthesizer in the real world.

Joe

Sent from Yahoo! Mail for iPad

                                                            From:                                                        Marc de Piolenc <piolenc at archivale.com>;                            
                                                            To:                                                         <personal_submersibles at psubs.org>;                                                                                                     
                                                            Subject:                                                        Re: [PSUBS-MAILIST] Group Help Request                            
                                                            Sent:                                                        Mon, Oct 28, 2013 10:46:58 AM                            

Never thought much about doing it at small scale.

I suppose I would set up something like a wood lathe or a potter's wheel 
and work in some very soft material like low-density foam. Once I had 
the shape that I wanted, I suppose one could pour a mold around the 
master, melt or dissolve out the pattern and cast the final part in some 
suitable plastic, or even in aluminum if you were ambitious.

3D printing seems like the ultimate way to do it, though - the accuracy 
available is already better than what we would need, and if the inital 
results are not perfect, making changes and printing out another 
prototype is very quick.

Marc

On 10/28/2013 6:13 PM, Joe Perkel wrote:
> How can a home builder maintain that contour 360 Deg out of "X" material?
>
> Joe
>
> Sent from my overpriced
> iPhone
>
> On Oct 28, 2013, at 2:57 AM, Marc de Piolenc <piolenc at archivale.com> wrote:
>
>> Quick clarification: a properly contoured Kort nozzle, MARRIED TO A MATCHING PROPELLER, will increase static and low-speed thrust. Of course it won't increase power, since that comes from your motor. If you just put a shroud around your existing prop, you will be disappointed, and a shroud that doesn't do the job is overpriced unless it's free! Key ingredients for success:
>>
>> Prop matched to the shroud
>> Shroud matched to the speed and thrust requirement of the vehicle
>> Motor matched to the resulting prop
>>
>> Marc
>>
>> On 10/28/2013 8:33 AM, Jon Wallace wrote:
>>>
>>> What is the cost of having a true Kort nozzle machined by a CNC? I think
>>> a 30% improvement in thrust for $30 would be great but I suspect
>>> machining a Kort is going to equate to many hundreds of dollars, if not
>>> reaching beyond a thousand.  When I look at the Snoopy underwater videos
>>> it is difficult to imagine a kort nozzle really making any difference in
>>> the operational experience given that the motors are operating very
>>> slowly and pushing Snoopy around at about 2 knots (estimated).  The
>>> props are designed for power, but that's what we want underwater.  True,
>>> a kort nozzle would increase that power but what is the return on the
>>> cost?  In other words, on a road with a speed limit of 30mph and no
>>> passing zones it doesn't matter whether you have a 1.6 liter or 5.4
>>> liter engine under the hood does it?
>> --
>> Archivale catalog: http://www.archivale.com/catalog
>> Polymath weblog: http://www.archivale.com/weblog
>> Translations (ProZ profile): http://www.proz.com/profile/639380
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>
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>

-- 
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
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