Also, that list of figures gives support to what seemed to be the case about the round masts versus the foil shaped masts.
Prefer the foil shaped masts. The old schooner masts i had on sidecar seemed about right.
Unless someone can show how other shape is better.

--------------------------------------------
On Tue, 12/6/18, StoneTool owly@ttc-cmc.net [harryproa] <harryproa@yahoogroups.com.au> wrote:

Subject: Re: : Re: : Re: [harryproa] Rob's cheap wing sails
To: harryproa@yahoogroups.com.au
Received: Tuesday, 12 June, 2018, 10:45 PM


 












On
06/11/2018 11:25 PM,
realink@iprimus.com.au
[harryproa] wrote:


 







Ive no doubt rigid is faster. and not by a bit
but a lot
faster. Greenbird managed 126 mph on land. The
thing here
is that reefing probably isnt reliably
possible so the
wing relies upon a zero AoA set. The profile
drag at zero
lift is better than a reefed standing rig, but
I know what
concerns Rob is what happens if the wind
shifts and the
bearing sticks.



Still there is something here worth exploring
as a perfect
bearing for 50% of sail area might be more
achievable than
the right soft wing design selection with all
its parts.









.








    This is really  not a realistic assessment.  A
rigid wing is
capable of driving something much faster than a single
surface
sail.... that is indisputable.   It's a perfect
match for foiling
craft and wheeled craft, not so much ordinary sailboats,
where it is
power that is needed, not the ability to still develop
lift when
sailing well in excess of wind speed, which is where the
rigid wing
will shine.   In boats we do not have the low friction
environment
to be able to harness the potential of rigid wings
effectively.   In
theory at least one should be able to go multiple times
wind speed
on a reach......the reality is different for our
use.  



    This really IS a classic example of the kid who
thinks applying
Indy car technology to a car used as a daily driver is a
great
idea...........  In ordinary sailing it is OTHER
limitations that
hold our speed to within certain limits.  Racers resort
to huge long
hulls, foils, etc to get wave making and friction
down.  It simply
doesn't apply for most of us.   Under typical
sailing conditions,
that fabric from the other face of the soft wing sail
would serve us
better as more sail area.



                               
                               
   
                               
                               
   
                               
H.W.



   


















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