Re: More about the wingsail hinged junk hybrid
- Hi, Tim
I like your wing design and I think you've found the best compromise
for your wishbones.
As you, I don't want to change the design of my sails. For me the
reason is the sails were already made.I can't change the balance in
front of the mast and so I can't build too short wishbones.
For my Tiki46 the distance luff-mast is 1.1m and the total length
wishbone + battens = 6m, so i think to choose a slimer profile to
limit the profile's thickness. I restudy my initial designs based on
the Clark Y or Benedek 6407E of Stieve.
The profile of the extrados is more important than the profile of the
intrados. On the intrados the main air flow will follows the shortest
distance from the nose to the end and the global pressure on the sail
is very weak compared to the depression on the extrados. More the
extrados is curved (until a limit), more the air flow is accelerated
in producing a big lift by depression. But for that the extrados
profile has to have a very smooth profile without angles. It's why I
think as Slieve the double junk rig sails are good to get an efficient
rig, easy to reef and handle. With such sails it's possible to test a
lot of different wishbone shapes.
- This is modelled after Edward Hooper's Splinter split junk sail.
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> Description : Shark 24 with original rig, 23m² junk sail, both superimposed
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