Did you find the presentation?
I went but could not locate it - any advice?
thanks Fedor
--- In harryproa@yahoogroups.com.au, "rob_rassy" wrote:
>
> Thanks for pointing that out Luc, I had missed that in the Pecha Kucha
> presentation. I had assumed there would be a track from the 15M schooner
> drawings. but this is a really nice simple solution. It pivots,
> turns lifts all with two component parts (excluding the rudder
> blade pivot pin)
> I imagine there would be a cross hull tube for it to mount in, so I
> wouldn't call it a hole as it would add strength to the hull and not
> detract from it
>
> Rob Rassy
>
> --- In harryproa@yahoogroups.com.au, "LucD" wrote:
> >
> > In the recent Pecha Kucha presentation Rob shows a rudder design I was
> not familiar with. I guess it is the one I could not decipher from the
> drawings of the schooner vis on the hp web site. Of course compromises
> are made (like there is a hole in the hull, symmetric foil, ...) but it
> looks again so elegantly simple as I can already guess how the potential
> disadvantages of some features are covered for by other parts. The whole
> presentation to me is an illustration of the title that Rob merits: Zen
> guru in the art of sailboat design. Maybe to bring out this image to
> those not in awe by the drawings at first glance, Rob should shave his
> head ;-) Marvelous.
> > Luc
> >
> > --- In harryproa@yahoogroups.com.au, "rob_rassy" wrote:
> > >
> > >
> > >
> > >
> > > I agree Rob's original design is probably the best solution. After
> all he did go out and do the actual testing and didn't lose sight of his
> goal of lightweight and simple. They are proven to work and achieve all
> the desired features (lift able, kick up, reversible, serviceable) with
> a minimum of fuss
> > >
> > > My only concern with the original design is the lower pivot mount,
> which I feel is to, low and will become a hand break when the boat is
> pushed. I have considered other ways of mounting them higher but the
> problem is the same as the beam mounts they get heavier the further they
> are from the water
> > >
> > > My most recent thoughts are trim tabs on (close to) both ends of the
> lee hull bottom to counter the asymmetric thrust /drag forces of the
> Harry (weight to windward) design. They would be semicircular
> self-retractable (spring loaded), and set in slot at a fixed angle or
> could be in a drum for extra adjustment and complication.
> > >
> > > If the rounding up forces were removed or reduced the beam mounted
> rudders would come into calculation for me. At the moment I feel the
> beams mounts are not wide enough apart to perform this job with out
> being to large.
> > >
> > > I am open to being convinced otherwise though
> > >
> > > Rob Rassy
> > >
> > >
> > > --- In harryproa@yahoogroups.com.au, "von Balluseck, Fedor" wrote:
> > > >
> > > >
> > > > Nice discussions!
> > > > Think the drum 'outside' is going to be in size comparable to the
> first generation of rob's rudders - if not bigger - like on Visionary.
> > > > Keep in mind those rudders are fairly big - and to get the balance
> right the rudders have to be either angled or the moved about15-20% back
> (longitudinal? ) So the drum is big - not sure but would guess
> 60-100cm's on Visionary.
> > > > Maybe you can reduce the size of the rudders if you go for
> additional leeway protection measures - but that stirs up the
> 'additional boards question.
> > > > Browse back in the posts - there was a long discussion on multiple
> boards or a lee-board that could pivot. Rick W makes a point that
> against intuition and leeboard on the WW side of the lee hull would be
> most efficient.
> > > > I believe Arttu's Ono visionary has added 2 boards to the original
> 2 rudders - and he has shared some comments on how this is working (but
> no protection against grounding)
> > > >
> > > >
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