Have a look at camrig.com for some examples. They give you some
specs on camereas being small enough with long enough footage to be
worth while 1000 photo's ever ten sec. or up to 1 and 1/2 hours of
dvd quality video in a water proof camera as light as 5 oz.
I tried to upload the photo's keep getting network error.
The photos are of the model fee sailing. There some photos and video
at
http://groups.
I wonder if the rig could be made light enough and rigid enough to
work on a larger scale. Cut that huge wing mast into 4 vertical
pieces and build a frame for the two sails possibly. Also if using
the solid sail wing configuration the distance between tacks from
one bow to the next could be shorten the wings could be made with a
profile of two leading edges never needing to rotate 180 from one
shunt to the next similiar the the bolger sail. The Double A frame
rig has a fixed cant to windward but moving rig between bow an
midship produces variable sail to wind angle. ex. furthest position
forward shallow angle less lift,furthest postion back midship
greatest angle most lift.
Todd
--- In harryproa@yahoogrou
>
> Kite photography pretty amazing. The guy on the mono is in the
Transpac next year, will be good to see what gear he has.
>
> where are the double A frame photos?
>
> regards,
>
> Rob
> ----- Original Message -----
> From: Todd
> To: harryproa@yahoogrou
> Sent: Saturday, March 17, 2007 3:45 AM
> Subject: [harryproa] Re: Aerodynamics and sailing performance
>
>
> So what has a more efficient leading edge the foresail on a wire
or
> the mainsal on a thick wing mast?
>
> I have a rig that would seem to fit a harry style proa the way
most
> accomadation and sailing are done from the windward hull. If the
rig
> could be built as light as the rig used now.
> Double A frame is also a lifting rig and could be used with
solid
> wing sail or soft sails. Only thing it would have to have some
> standing rigging.
>
> Have a look in the photos double A frame.
>
> --- In harryproa@yahoogrou
> wrote:
> >
> > Hello Todd,
> >
> > Yes, a successful ustayed mast solution is great news - the
loss
> > of the stays can deliver a disproportionally large reduction
in
> drag,
> > but other items then assume greater importance. Remove one
> problem to
> > reveal the next, as always.
> >
> > The 'wire vs foil' illustration is well established; we did do
> stuff
> > at the CAAE in small, crude wind tunnels, but one can play
around
> with
> > models in a breeze - the effect is that obvious.
> >
> > Yes, chord and span play their part - the point is that for
the
> given
> > sections, the illustration is valid. Everything scales pretty
> well,
> > if you allow for reynolds Number.
> >
> > Not sure I followed your last point about the sails?
> >
> > Arguably one of the greatest airfoil designers of the present
day
> was
> > (I think) trained as a musician - John Roncz. His results
speak
> for
> > themselves.
> >
> > An ounce of experiment is worth a pound of theory in my book.
> >
> > All the best, Ben
> >
> >
> >
> > --- In harryproa@yahoogrou
wrote:
> > >
> > > I like the idea of an unstayed mast especially on a boat
that
> > > doesn't need to have gobs of sail area to attain good
overall
> speed.
> > >
> > > Don't really agree with you on the wire vs foil thingy, may
be
> just
> > > my misunderstanding. I don't have a formal education in
> > > aerodynamics. But doesn't frontal area and cord width play a
> part in
> > > your apple vs an orange theory ;) I wonder what the out come
> would
> > > be with the same size sail for given length masts attach to
each
> > > would be?
> > >
> > >
> > > Rob,
> > >
> > > If the whole principal behind your designs are minimal
material
> and
> > > hardware then why such the high price tag $$$$$ on used
boats ?
> > >
> > > Todd
> > >
> > > <znip>
> >
>
>
>
>
>
>
> ------------
-----------
>
>
> Internal Virus Database is out-of-date.
> Checked by AVG Free Edition.
> Version: 7.1.394 / Virus Database: 268.18.6/709 - Release Date:
3/3/2007
>
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