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Old 04-05-2016, 02:05   #31
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Re: Square-Rigging System for Sail Boat - Info, Please

Quote:
Originally Posted by first wind View Post
when sailing down wind, lift is not what moves your boat; drag is. in other words, when sailing down wind, the wind pushes your boat along.

also, they didn't think the world was flat before Columbus sailed to America.
This is a very old thread! 6 years.. Anyway, I love to beat a dead horse.

A well adjusted and set square rig can continue to provide lift rather than just drag even dead downwind. Much like a parasail spinnaker does. It helps dampen roll and can improve speed.

The squaresails sheets need to be eased slightly to let the wind flow though the slot, down to the next square below.

You can spill the wind very effectively by easing the sheets carefully so the sail is mostly pulling up rather than forward. This quickly depowers the sail without flogging.
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Old 04-05-2016, 02:33   #32
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Re: Square-Rigging System for Sail Boat - Info, Please



This is a great picture that shows Duyfkens sails depowered. The mainsails sheets and tacks are eased and it is lifting nicely rather than driving. The foresail is also lifting and the foretopsail is lowered with the sheets eased depowering it nicely. The spritsail is the only thing powered up.

She is a remarkably effective sailing machine. She sailed better to windward than any squarerigger I have sailed on. There is many layers of very sophisticated thinking in her hull and rig, and to be honest we know only a small fraction of what the original crew and builders would have about how to make these ships sail well.
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Old 04-05-2016, 02:42   #33
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Re: Square-Rigging System for Sail Boat - Info, Please

Since I am on a roll beating up the poor dead horse, here is Duyfken powered up to windward.



And with topsails reefed to depower her. The Bowlines stop the squaresail flogging and this looks ugly but is actually quite effective. Later theu invented reefing, footropes and buntlines.

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Old 04-05-2016, 03:37   #34
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Re: Square-Rigging System for Sail Boat - Info, Please

Sorry to induce a bit of a thread drift, concerns downwind sailing with a heavy ketch.


Gaffers sometimes use a “Ringtail “ sail extensions to enlarge the main.
Someone ever seen a ringtail set on a modern triangular mainsail ?
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Old 04-05-2016, 04:00   #35
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Re: Square-Rigging System for Sail Boat - Info, Please

Ha, no I haven't, but I love the idea. If it was set up right the yards could be braced "square " athwartships so when you gybe the ringtail doesnt foul the backstay. The gaff/upper yard could be clipped onto the topping lift, its own halyard or another line to control it while raising and lowering.

I would probably go a shallow triangular head with the upper yard about a meter or so below the head of the sail and made from something light and flexible inside a padded pocket in the sail.

Sounds like a fun sail to play with!

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Old 04-05-2016, 04:38   #36
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Re: Square-Rigging System for Sail Boat - Info, Please

I was thinking about a “Lug” spar made out of carbon or cane, some 3 yards long, maybe even four yards. Hoist with the boom lift.
Triangular sail with lug spar in a sleeve of the spinnaker cloth, placed at the aft end of the sheeted out mainsail. Not behind the sail as they use ringtails but in front seen from wind direction.
With a lug type of ringtail gybing would not be possible because of the back stays, but hey, you just get it down to gybe.
Could effectively build a gaff sail out of a bermudan sail.
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Old 04-05-2016, 05:18   #37
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Re: Square-Rigging System for Sail Boat - Info, Please

Kind of like a fore and aft stunsail.



It always makes me laugh how gaff rig was derided as being bad to windward, and pointy sails were better. Look at all the performance boats now! Big square top "gaff" sails...

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