Hey Ben,
To further my explanation of rig comparison. I looked up cutter rig.
I found mast aft cutter
http://www.runningt
Now just turn the rig perpendicular, ama to vaka. With this set up
sure you need an extra set of sails.
I was inspired by the mini20 bow sprits that swivel out from bow and
figured why not connect it to the mast and it started from there.
But know looking at the aft mast configuration it has me thinking.
Todd
--- In harryproa@yahoogrou
>
>
> Hi Ben ,
>
>
> It's not really a biplane rig. To compare it to somthing if one
> needs to . Its more like a cutter rig. The frame work that it
hangs
> on predicts the sails cant to windward at various rotatation of
the
> rig fore and aft.
>
> The biplane rigs try and achieve seperate air flow from both sails
> right . The double A frame rig has the two sails working as one.
> Having the benifit of sail area with a lower COE and canted to
wind
> ward to produce lift possibly and or achieving greater range
before
> reefing is needed.
>
> Todd
>
>
> --- In harryproa@yahoogrou
> wrote:
> >
> > Hi Todd,
> >
> > Found your pix and now I get it!
> >
> > Biplanes are fun - I've only ever played with the more mundane
> > catamaran with goalposts approach - the sail area needed usually
> > forces the hulls far apart due to the sail cord and the need to
> > minimise biplane-type interference between the sails.
> >
> > Very interesting. Thanks.
> >
> > All the best, Ben
> >
> >
> > --- In harryproa@yahoogrou
> > >
> > > Hello Ben,
> > >
> > > I agree nothing is perfect but building a rigid enough frame,
> could
> > > even use wing shaped spars on the lower and windward side of
the
> > > frame to reduce drag of the expose frame. and useing battens
as
> > > shown on the model would increase stability of sails for your
> > > variables mentioned.
> > >
> > > I'd really like to make the Rig free satnding. But havn't
> worked
> > > out if the extra weight or the geometry will allow it. If not
> only
> > > four wires for standing rigging under low loads are needed.
> > >
> > > Todd
> > >
> > >
> > > --- In harryproa@yahoogrou
<brag_rotor@
> > > wrote:
> > > >
> > > > Hi Todd,
> > > >
> > > > ....afaik the 'curved plate' of a 'perfect' foresail is as
> good as
> > > it
> > > > gets, if (and only if) the foil is 'perfectly' aligned to
the
> flow.
> > > >
> > > > In an imperfect world (boat movement, gusts, wind shear, sail
> > > > cut/twist, crew member errors, dozy skippers) the rounded
> leading
> > > edge
> > > > of a classical airfoil can work well over a much larger
range
> of
> > > > angles of attack - as it needs to.
> > > >
> > > > ..am still struggling with dialup here, been purging several
> > > thousand
> > > > spam emails from the system..... <sigh>
> > > >
> > > > Your rig sounds interesting.
> > > >
> > > > All the best, Ben
> > <snip>
> >
>
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