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<body link="#000000" vlink="#000000" alink="#000080" topmargin=0
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size=2>Searching for Seadoo Scooter. Purchase one cut
the kort nozzle off and scrapp the rest. <BR>The swiming aid device
of the
serie and damage units are below 50 USD..<BR><BR><A
href="http://www.pbsboatstore.com/sea-doo.htm">http://www.pbsboatstore.com/sea-doo.htm</A><BR><BR><A
href="http://www.ebay.de/itm/SeaDoo-Supercharged-Tauchscooter-Tauchen-Tauchsouter-/190947133334?pt=Tauchzubeh%C3%B6r&hash=item2c75560796">http://www.ebay.de/itm/SeaDoo-Supercharged-Tauchscooter-Tauchen-Tauchsouter-/190947133334?pt=Tauchzubeh%C3%B6r&hash=item2c75560796</A><BR><BR><BR>vbr
carsten <BR> </font>
<BR>
<BR>"Joe Perkel" <josephperkel@yahoo.com> schrieb:
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<div style="RIGHT: auto">Jon,<BR clear=none><BR clear=none>The short
answer is I dont know. But look at that Dutchman and his simplistic
ingenuity. Thats what Im hoping for out of this group as far as
materials and processes. Im ready to draw up whatever the result.
Consider that there are intrepid builders of all sorts of things
worldwide. Hovercrafters build large scale ducts for thier craft as a
example. I'll take a look there tomorrow.</div>
<div style="RIGHT: auto"> </div>
<div style="RIGHT: auto">How about half a kort??? A plug of some kind
(<EM style="RIGHT: auto">construction grade foam
perhaps</EM>?) to build up a FRP shell over then mate two
halves Revelle model style??? Can this shape be hot wired?? What to
use as a guide? I have ideas and questions, but I need the shop wizards
of the world to come up with the process.</div>
<div style="RIGHT: auto"> </div>
<div style="RIGHT: auto">As for The other things, Im ready and willing.
I like the thruster because with my family and work time
constraints, its not too much to chew on. I can commit to small projects
for now, bigger later as time goes on.</div>
<div style="RIGHT: auto"> </div>
<div style="RIGHT: auto">What would you like to see done apart from the
thrusters?</div>
<div style="RIGHT: auto"> </div>
<div style="RIGHT: auto">Joe</div></TD></TR></TBODY></TABLE>
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0px" class=hr contentEditable=false readonly="true"></DIV><B><SPAN
style="FONT-WEIGHT: bold">From:</SPAN> </B>Jon Wallace
<jonw@psubs.org>; <BR clear=none><B><SPAN style="FONT-WEIGHT:
bold">To:</SPAN> </B>Personal Submersibles General Discussion
<personal_submersibles@psubs.org>; <BR clear=none><B><SPAN
style="FONT-WEIGHT: bold">Subject:</SPAN> </B>Re: [PSUBS-MAILIST] Group
Help Request <BR clear=none><B><SPAN style="FONT-WEIGHT:
bold">Sent:</SPAN> </B>Mon, Oct 28, 2013 12:33:12 AM <BR
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<DIV class=yiv4006986947moz-cite-prefix><BR clear=none>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?<BR
clear=none><BR clear=none>Like Vance, I don't
want to rain on the parade and I do "get it" that the challenge of
coming up with a "home-built" alternative can be rewarding. I just
think that production cost will be the determining factor on practical
use. Like going from T-Rex back to minn-kota, I can't
help but wonder if the ultimate conclusion will turn out to be that the
stock minn-kota's are good enough for 99.99% of our
applications.<BR clear=none><BR clear=none>I can think of many things
that your CAD experience could offer to the group if you are interested
in providing some designs. For example the K350 plan modifications
that have been talked about by a few people. We could really use
help in that area. <BR clear=none><BR clear=none>Jon<BR
clear=none><BR clear=none>
<DIV id=yiv4006986947yqtfd06606 class=yiv4006986947yqt2557565796><BR
clear=none>On 10/27/2013 6:20 PM, Joe Perkel wrote:<BR
clear=none></DIV></DIV>
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<DIV><SPAN>Alec,</SPAN></DIV>
<DIV><SPAN></SPAN> </DIV>
<DIV style="FONT-SIZE: 19px; COLOR: rgb(0,0,0); FONT-STYLE: normal;
FONT-FAMILY: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida
Grande, sans-serif; BACKGROUND-COLOR: transparent"><SPAN>I've
gone round and round for the past two weeks in depth on the issues of
propulsion and have come full circle back to the trolling motors. I was
on hiatus for the discussion mentioned by Vance ref contact with the
manufacturer as I would have remembered that.</SPAN></DIV>
<DIV><SPAN></SPAN> </DIV>
<DIV style="FONT-SIZE: 19px; COLOR: rgb(0,0,0); FONT-STYLE: normal;
FONT-FAMILY: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida
Grande, sans-serif; BACKGROUND-COLOR: transparent"><SPAN>So,
I'm with you on the prop and nozzle. While the 101's
may indeed have <SPAN
id=yiv4006986947misspell-0><SPAN>plenty</SPAN></SPAN> of guts for the
job as is, the Kort data shows a 30% improvement in Bollard thrust at
low speeds for any given prop diameter. That and the added benefit of
protecting the prop, are significant enough reasons to forge ahead.
</SPAN><SPAN>This is actually good news, less work by not mucking around
with the guts of the motor.</SPAN></DIV>
<DIV><SPAN></SPAN> </DIV>
<DIV><SPAN>You guys are the builders with recent hands on, I'm
behind in the trial and error business because I cant get started
tinkering yet. But as you well know, I developed CAD capability for this
purpose only, so time to put it to real use. Where I need help is
deciding on materials and manufacturing processes. I can give you guys
the cutting files needed to whittle a Kort out of a block of solid
titanium, but that would not be practical. <SPAN
id=yiv4006986947misspell-0><SPAN>That's</SPAN></SPAN> my
limitation and where hands on <SPAN
id=yiv4006986947misspell-2><SPAN>experience</SPAN></SPAN>
counts.</SPAN></DIV>
<DIV><SPAN></SPAN> </DIV>
<DIV style="FONT-SIZE: 19px; COLOR: rgb(0,0,0); FONT-STYLE: normal;
FONT-FAMILY: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida
Grande, sans-serif; BACKGROUND-COLOR: transparent"><SPAN>Now these
nozzles are reverse foils with coordinates in percent of <SPAN
id=yiv4006986947misspell-1><SPAN>length</SPAN></SPAN>. I can generate a
NACA 4415 on my airfoil generator and transfer that to the
model. I can give us accurate 3d models and eventually CNC
cutting files for whatever the group wants on these Minn Kotas, nozzles
and attachment hardware. I can do both Nozzles, Marin 19A, and
or 37, with the latter being optimized
bi-directionally.</SPAN></DIV>
<DIV><SPAN></SPAN> </DIV>
<DIV><SPAN>Finding something off the shelf would be ideal, but I suspect
given the nature of the business and the quote I recieved it would
likely prove <SPAN
id=yiv4006986947misspell-4><SPAN>problematic</SPAN></SPAN>.</SPAN></DIV>
<DIV><SPAN></SPAN> </DIV>
<DIV style="FONT-SIZE: 19px; COLOR: rgb(0,0,0); FONT-STYLE: normal;
FONT-FAMILY: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida
Grande, sans-serif; BACKGROUND-COLOR: transparent"><SPAN>You need a new
square tip prop to optimize the duct. I've had custom props
made for my boat in the past, so that should not prove insurmountable. I
should be able to do the prop as well. </SPAN></DIV>
<DIV style="FONT-SIZE: 19px; COLOR: rgb(0,0,0); FONT-STYLE: normal;
FONT-FAMILY: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida
Grande, sans-serif; BACKGROUND-COLOR:
transparent"><SPAN></SPAN> </DIV>
<DIV style="FONT-SIZE: 19px; COLOR: rgb(0,0,0); FONT-STYLE: normal;
FONT-FAMILY: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida
Grande, sans-serif; BACKGROUND-COLOR: transparent"><SPAN>Can we post
pictures on this forum?, I forget. It would be helpful to point things
out. If I could post pictures of the various exploded diagrams, I
can point to where I want dimensions with red arrows. Eventually,
I'll start a web-page.</SPAN></DIV>
<DIV><SPAN></SPAN> </DIV>
<DIV><SPAN>So for now, I need some detail on the shaft and prop as is.,
what have you done with that washer and where it is in the drive, as
well as any other modifications.</SPAN></DIV>
<DIV><SPAN></SPAN> </DIV>
<DIV><SPAN>I think this is a decent group effort project, and one
that can pay dividends in the end.</SPAN></DIV>
<DIV><SPAN></SPAN> </DIV>
<DIV><SPAN>Joe</SPAN></DIV>
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<font face="Courier New" size=2> </font><font face="Courier New"
size=2><br><br>-- <br><BR>Carsten Standfuß<BR>Dipl.Ing.Schiffbau @
Meerestechnik<BR>Heinrich Reck Str.12A<BR>18211 Admannshagen<BR><BR>0172
8464 420<BR>WWW.Euronaut.org<BR>Carsten@euronaut.org</font></body>
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