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Old 12-20-2013
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Using Jib and Genoa at the same time to create spinnaker

I haven't tried this but it keeps sticking in my head. Could you raise both the hank on jib and genoa on the same forestay? You could pole one out or both if need be. Do you think this would work?
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Re: Using Jib and Genoa at the same time to create spinnaker

Yes, it could be done... but.... are the hoists identical? If you used one halyard then neither sail is likely to get proper luff tension.. do the hanks 'align' in a good way? Using two halyards, if the hanks don't interfere you might get some decent set, but both need releasing to drop either..

And it would be a handful on the foredeck when it does all come down. All in all it's probably easier to use main and headsail..
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Re: Using Jib and Genoa at the same time to create spinnaker

Just fly the lighter sail loose luffed
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Re: Using Jib and Genoa at the same time to create spinnaker

This site on self-steering talks about using two hank-on jibs for self-steer dead downwind:
Blue Anarchy Sea Collective >> Self Steering Without A Windvane

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Re: Using Jib and Genoa at the same time to create spinnaker

Boats set up for flying twin jibs often have double forestays so each jib is hoisted on its own forestay. That way the hanks don't interfere with each other. A double-slotted roller-furler setup could work the same way. You obviously need two halyards to do this, and any roller-furler snafus would be twice as bad as they might have been otherwise. Most often people seem to fly two jibs of the same size - as in the photo above . This helps to keep the forces even and make it easier to steer a straight course.
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Re: Using Jib and Genoa at the same time to create spinnaker

Though I've never tried it myself, I've heard it said that the twin headsail arrangement induces the most awful rolling.
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Re: Using Jib and Genoa at the same time to create spinnaker

Quote:
Originally Posted by paulk View Post
Boats set up for flying twin jibs often have double forestays so each jib is hoisted on its own forestay. That way the hanks don't interfere with each other. A double-slotted roller-furler setup could work the same way. You obviously need two halyards to do this, and any roller-furler snafus would be twice as bad as they might have been otherwise. Most often people seem to fly two jibs of the same size - as in the photo above . This helps to keep the forces even and make it easier to steer a straight course.
I've seen a light air 'drifter' that was a 2 ply sail on a common luff... tie the clews together to use it as a light air 'genny', split them on separate sheets and open it up butterfly style for running.. might make more sense than fighting two separate sails on hanks. - plus equal areas as you suggest.
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Re: Using Jib and Genoa at the same time to create spinnaker

Quote:
Originally Posted by Faster View Post
I've seen a light air 'drifter' that was a 2 ply sail on a common luff... tie the clews together to use it as a light air 'genny', split them on separate sheets and open it up butterfly style for running.. might make more sense than fighting two separate sails on hanks. - plus equal areas as you suggest.
Wow that sounds really cool. This kind of sail would keep you in the non-spinnaker class wouldn't it?

I am going out on the boat tomorrow so maybe i will play with this idea and see what happens. I am thinking about attaching the single halyard to both sail heads, attach the tack of the genoa to the deck and run a line from the tack of the jib to the deck this way the halyard can apply tension on both sails.
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Re: Using Jib and Genoa at the same time to create spinnaker

I have raced downwind on a boat flying the mainsail and twin gennys on a furler with two slots, in 18-25 kt winds. The boat was extremely stable, with no rolling at all. The second genny increased our boat speed about 3/4 kt. or more. With all three sails flying, the steering angle is narrow. You have to find the angle where the wind can get to all three sails without having one of the gennys blanketed by the mainsail. We tried it with one genny poled out and with both of them flying free, and they worked well both ways.
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Old 12-22-2013
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Re: Using Jib and Genoa at the same time to create spinnaker

This sail configuration is called in german passat sail...
It was developed at a time where wind vanes and autopilots where not very common... So you linked the two sheets back to your tiller or wheel and thus creating an effective self steering system...
But you needed to deploy 2 poles which the majority of the boats don't have, let alone all the lines for that...
Google passatsegel and look for images...

Oh and btw:
In this configuration you do not fly a main and thus the boat tends to roll...
With the main up, the center of effort of the sails is to leeward and hence stabilizing the boat... Without the main, the center of effort is at the centerline and then rolling is only to be expected...

Last edited by capt vimes; 12-22-2013 at 06:47 AM.
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