We actually crossed the atlantic with this setup. During the crossing we topped 19.6 knots with the rubber band steering so its not only for light winds. Also, heavy long keeled boats handle this kind of self-steering better than sport boats.
I think you have little understanding of the technique at all if you are making such sweeping statements. Sheet-to-tiller self steering is well established and a number of publications (both books and articles) have been written about it and thousands of boats have criss-crossed oceans using S-to-T self steering.
The principal is that for a steady wind the pressure in the sails varies as the boat veers up into the wind (lower pressure) or down wind (pressure increases). This varying pressure is transmitted to the main and jib sheets. Sheet to tiller self steering simply transmits this tension variation to the helm. In this video this achieved by attaching the geneker sheet to to the helm, and balancing the pull from the jib sheet with a piece of shock cord.
That's correct but when you sail with a gennaker (or jib) it's actually the opposite. The pressure increase when you head up into the wind and decrease when you bear down wind.
Yes, sorry, you are correct of course. I hadn't noticed that you are sailing with the wind on the quarter. Have you tried it without the mainsail hoisted? I just wonder because on all other points of sailing the situation is the reverse and I wonder of it is because the main starts to mask the jib/geneker when you veer down wind.
I guess the main masks the jib/genaker but it also has to do with the airflow. When you head up wind the airflow changes from turbulent to laminar flow over the sail surface and this increase the force a lot.
it has to do with the apparant windspeed. Assume sailing on a broad reach. When bearing away, the apparant wind decreases en the tension on the sheet accordingly.
when sailing close hauled, there are 2 options:
1) All tell tails on the jib point backwards. In this case the tension on the sheet increases when bearing away. This also happens when the inner telltales flutter.
2) the out telltales flutter. In this case the sheet tension decreases when bearing away.
What confuses me about this video is that it seems like the sheet-to-tiller line is taking the full pull of the headsail. It doesn't seem like the sheet is made fast at all.
As the boat veers up wind or down wind, the pressure in the sails alters, upwind - less pressure, down wind - more pressure. This pressure is transmitted to the jib sheet in terms of either more tension or less tension. In the video, the jib sheet is attached directly to the tiller from one side of the boat, and this is balanced by shock cord (in yellow) from the other side. the change in jib sheet tension steers the boat back on coarse.
Helt jävla genialiskt, jag håller just nu på att bygga mig en egen variant som bygger på samma princip, ska försöka få det att funka på min Comfort 26:a..
this stuff is cool but is ONLY for light winds and sport boats and having a drink! good little set up. i just fix my rudder with bungees.
MattB221178 2 years ago
We actually crossed the atlantic with this setup. During the crossing we topped 19.6 knots with the rubber band steering so its not only for light winds. Also, heavy long keeled boats handle this kind of self-steering better than sport boats.
jensutbult 2 years ago
@MattB221178
I think you have little understanding of the technique at all if you are making such sweeping statements. Sheet-to-tiller self steering is well established and a number of publications (both books and articles) have been written about it and thousands of boats have criss-crossed oceans using S-to-T self steering.
nmacparthalain 1 year ago
Yea it does and it is working like we can see in this video. It's actually a pretty smart idea. Good on you mate.
a6km 2 years ago
To A6km
The principal is that for a steady wind the pressure in the sails varies as the boat veers up into the wind (lower pressure) or down wind (pressure increases). This varying pressure is transmitted to the main and jib sheets. Sheet to tiller self steering simply transmits this tension variation to the helm. In this video this achieved by attaching the geneker sheet to to the helm, and balancing the pull from the jib sheet with a piece of shock cord.
panthablue 2 years ago
That's correct but when you sail with a gennaker (or jib) it's actually the opposite. The pressure increase when you head up into the wind and decrease when you bear down wind.
jensutbult 2 years ago
Yes, sorry, you are correct of course. I hadn't noticed that you are sailing with the wind on the quarter. Have you tried it without the mainsail hoisted? I just wonder because on all other points of sailing the situation is the reverse and I wonder of it is because the main starts to mask the jib/geneker when you veer down wind.
panthablue 2 years ago
I guess the main masks the jib/genaker but it also has to do with the airflow. When you head up wind the airflow changes from turbulent to laminar flow over the sail surface and this increase the force a lot.
jensutbult 2 years ago
That's an interesting point. You could well be right.
I guess the only way to prove whether it's one or the other is to sail with just the jib alone, and no mainsail.
I'm going sailing this weekend. If I get a chance I'll let try it out and let you know the result.
panthablue 2 years ago
it has to do with the apparant windspeed. Assume sailing on a broad reach. When bearing away, the apparant wind decreases en the tension on the sheet accordingly.
when sailing close hauled, there are 2 options:
1) All tell tails on the jib point backwards. In this case the tension on the sheet increases when bearing away. This also happens when the inner telltales flutter.
2) the out telltales flutter. In this case the sheet tension decreases when bearing away.
sjors6661 2 years ago
you obviously don't spend enough time actually sailing
robertjberry 2 years ago
What confuses me about this video is that it seems like the sheet-to-tiller line is taking the full pull of the headsail. It doesn't seem like the sheet is made fast at all.
mosqueira0123 2 years ago
Yes, the sheet-to-tiller line is taking the full pull of the gennaker. This is the way to go in light winds.
The sheet is fastened to the winch the normal way and then the sheet-to-tiller line is connected on the sheet shortening the sheet with a feet or two.
jensutbult 2 years ago
do not really understand how is this working can someone explain please ?
a6km 3 years ago
As the boat veers up wind or down wind, the pressure in the sails alters, upwind - less pressure, down wind - more pressure. This pressure is transmitted to the jib sheet in terms of either more tension or less tension. In the video, the jib sheet is attached directly to the tiller from one side of the boat, and this is balanced by shock cord (in yellow) from the other side. the change in jib sheet tension steers the boat back on coarse.
Does this help?
panthablue 2 years ago
Helt jävla genialiskt, jag håller just nu på att bygga mig en egen variant som bygger på samma princip, ska försöka få det att funka på min Comfort 26:a..
ha det / Kalle
filmkalle 3 years ago