Good question. General consensus was that it was from the bottom of the rudder, but how (if?) air got into it, I have no idea. Other possibility is that it was from the top of the rudder and air was sucked down the tube, but I think this would have been turbulence rather than the very neat vortex. Or a rope, but it looked just like a vortex. It was amazing how long and perfectly formed it was. I guess the trick next time would be to waggle the rudder and see what happens to it.
rob
On Sun, Mar 11, 2012 at 7:54 PM, heinrich_meurer <meurer@geotec-exploration.de> wrote:
coming back to the vortex...
how is it generated? Seems to come from the front rudder. Does it suck air through the rudder stock? Canīt be cavitation at the rudder tip - or can it? It seems not to be a trailing piece of rope dragged along by the rudder :-)> Obvious solution. Thanks. Not only is Helena a better photographer, she> meurer@...> wrote:
> is also nice enough to blur the bit of the shunt where I stuffed up and got
> a winch handle caught on one of the mast winches. Bent it with ease,
> fortunately I was not holding it at the time, or I would be down to my last
> 5 fingers.
>
> The shunt was a slow one as we paused mid way to tension the jib halyard.
> It all looks a bit busy with one person sheeting in the rig, one steering
> the old wheel, one the new wheel and having to push the jib car over.
> Normally, the jib car would happen automatically, one person could handle
> the wheels and with a bit of steering practice, the rig swings around so
> only needs the last metre or so winched on.
>
> http://youtu.be/LE7jw-yjTmQ
>
> And that vortex was fascinating!
>
> rob
>
> On Sat, Mar 10, 2012 at 7:30 PM, heinrich_meurer <
>
> > **
> >
> >
> >
> >
> > Beautiful pics - all of them. And what a difference it makes which sex is
> > behind the camera lense. Yours show a vortex from a rudder which could be
> > overloaded and Helena shows people. And yes - in some of the GoPro pictures
> > the Melbourne proa looks to be undercanvassed...and needing a recut of the
> > main.
> >
> > All three proas look very impressive.
> >
> > You could perhaps upload the video as a sequence of videos to youtube and
> > doesnīt Vimeo do very long videos?
> >
> > Thanks a lot for the effort!
> >
> > Heinrich
> >> > --- In harryproa@yahoogroups.com.au, Rob Denney <harryproa@> wrote:
> > >
> > > Helena Darvalid's photos are now in the 18m Melbourne Photos folder . The
> > > photos include some of Gaia's Dream (18m Pacific proa with some harry
> > like
> > > features) and some of Rare Bird. A much better effort than mine. Thanks,
> > > Helena.
> > >
> > > There is also a video, but it is 110 MB which the Files section won't
> > > upload. Any suggestions?
> > >
> > > regards,
> > >
> > > rob
> > >
> >
> >
> >
>
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