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17.06.2021, adminLog in or Sign up. Boat Design Net. I am an admirer of the idea of applying foils to sailboats. I do not think they are the future, I think they are the present and the only thing left to do in them is to slightly improve some aspects. But I'm not an expert on them at all. Although I can think of several questions, now I would sailinh like foil sailing boat zombie raise a couple of them : why do foils can improve stability?
How does the performance of sailboats improve? How is this phenomenon handled and how can it be used to increase the effectiveness sailung foils, or at least prevent this phenomenon from limiting the maximum speed that the boat can reach?
Thank you for your answers. Last edited: Oct 23, Foiling boats don't go DW because they blat fast enough to bring the AP forward, that is why you see them sheeted in foil sailing boat zombie matter the true wind angle.
Jim CaldwellOct 23, Also, fast foil sailboats "tack" going downwind rather than going directly downwind. As Jim Caldwell said above that brings the apparent wind foul so that from the boat dailing frame it is always going upwind. DCockeyOct 23, Jim Caldwell, I'm sorry but I do not understand you, probably because I'm not an expert.
I do not understand why foiling boats do not go down wind. Can not they go down wind?. Foil sailing boat zombie me if the answer is very obvious sailijg I am not able to deduce it.
DCockey, I understand how it can increase and vary the direction of the apparent wind but, what does that have to do with foils? David, first of all, thank you very much for your response and also thanks for Jim Caldwell's.
I interpret that sqiling with normal foils and sails do need spinnaker, if they want to take advantage of the force of fkil wind when they sail down wind. I think the case of sails-wings boats is different.
The apparent wind may be greater than the actual foil sailing boat zombie, I see that clearly, but I do not know how the apparent wind could turn to " so that from the boat reference frame it is always going upwind".
See my schematic and tell me, please, where is my error, what am I doing wrong and how goil I approach the subject. It does seem extraordinary at first, but a boat can make progress downwind faster than the wind and can beat a balloon in a race by zigzagging instead zo,bie going salling downwind. This has been foil sailing boat zombie for a long time with ice yachts where there's very low friction fiol the speeds are ridiculously high.
Now that we have foiling boats, the friction is similarly low and the speeds are sufficiently high for the saioing to travel more distance by zigzagging and still beat a balloon that's following a direct path downwind. When sailing at these deep angles, the apparent wind is from zomhie because the boat is moving so fast, and the sails have to be foil sailing boat zombie close in as a result.
The part that's difficult to get your mind round is how the wind can push a boat downwind faster than the wind is itself moving, but all that matters is that the wind is able to keep pressure on the concave side of foil sailing boat zombie sail and foil sailing boat zombie a vacuum on the convex side, and it can do that even boatt the boat is overtaking it.
Another way to think about it is to consider a wedge. If you take a wedge and squeeze it between two foil sailing boat zombie, the wedge will shoot out from between them in the direction of the thicker end of the wedge.
The wind pressing against the sail is one of those blocks while the ffoil is one side of the wedge. The other side of the wedge is the vertical part of the foil in the water, and the water serves as the other fojl.
The boat wailing in foil sailing boat zombie air and vertical foil in the water is the wedge being squeezed foil sailing boat zombie the wind and the water, and the boat is pushed in the direction of the wide end of the wedge.
David CooperOct 23, Thank you very much David Cooper, Iit's not easy to imagine but I think I'm beginning to understand what is happening. The simile of a wedge is illustrative. I seem to understand that the triangle of velocities I aombie drawn can not be applied in these cases because it is rather how and where areas of overpressure and depression are generated in the sails.
On the other hand, what I think I foil sailing boat zombie is that the foiling boats do not need to go completely down wind because, although they travel more distance doing zig-zags, the final speed distance from the origin to the end point divided by time would be much greater than that of a boat with a balloon going directly downwind.
Apparent foil sailing boat zombie as I experience it when it goes fast. HJSOct 23, HJSyes, you are right, sxiling sketch was incorrect. I have foil sailing boat zombie it for a more correct flil. CTI don't know that foils are the present, it's just one opinion.
Well, I do foil sailing boat zombie want this opinion of mine that, like all, is subjective, can spoil the good direction of this thread. Two days ago I attended a conference of the naval architect Manuel Ruiz de Elvira and I have deduced that it is only very specific aspects foil sailing boat zombie remain to be studied in the foils. That's why I said foils are the present, not the future.
I think that can be said without being an boaf in foils. I do not want the thread to drift foil sailing boat zombie that direction, but of course we can comment on anything you want. Last edited: Oct 24, I pulled the post to avoid drift.
Thank you for being polite. CTOct voat, I suppose they can control and regulate the height on water at zomnie the hulls "fly". If so, how is it achieved?. Thanks in advance for your answers.
There are two ways of controlling flight height, one active with many variations and the other passive. The passive approach is simple - have a tilted foil so that the deeper it goes in the water, the more lift it foil sailing boat zombie, and the higher it goes, the less lift it creates, so it keeps returning to the altitude where the amount of lift is equal to the mass of the boat.
The angle of attack of the foils is usually adjustable so that the flight height can be set to the same level in strong winds as lighter ones. Active foils usually have an adjustable flap or allow rapid foll in angle of attack so that the amount of lift generated can be adjusted moment by moment with the whole foil remaining underwater. A "wand" is often used to read the height of the boat above the water's surface so sailint the foil can be made to generate more lift when the wand is high and less lift when it's low.
It's also possible to control the flap angle foil sailing boat zombie with some boats, but it's hard for human reactions to keep up with events and it's normally essential to have some degree of automation. To ssailing foil sailing boat zombie foils in action, look up videos of foil sailing boat zombie Flying Phantom L foils used for the most part as if they are V foils and A Class cats with "Z" foils - they foil sailing boat zombie sloping foils to regulate altitude, although some of the altitude control also comes from the foil being more efficient at depth rather than near the surface.
The America's Cup boats have L foils, but they have a degree of automation in controlling the angle of attack which allows them to use the main lifting part of the foil horizontally without the altitude of the boat rapidly going out of control - without rapid changes in angle of attack of a horizontal foil, the boat will likely porpoise, jumping up suddenly and crashing down violently as the amount of lift changes.
David CooperOct 26, Thanks David, I have to read carefully and think about sailinv answers. Probably more questions will come up. Thanks. You must log in or sign up to reply. Show Ignored Content. Similar Threads.
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