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from my observations you are incorrect

From 24 seconds onwards it looks like the wind is approximately abeam.

Yes sure

There are always comments from the less intelligent who cannot understand the simplest of things.

I thought that initially but he has got it right.

@@ColinMill1 Yes Peter W is right. I mistunderstood the trim wing as a flap but it's not. Its a 'tailplane' providing decalage to the main wing. ie. the trim wing acts opposite to the wing to set an angle to the wind in the same way a tailplane on an aircraft provides downforce to set the lift angle on a planes main wing. So yes, when the lever is pushed 'forward' indeed the mainsail will rotate to the provide forward lift and the trim wing acts opposite to this lift vector to set the main wing (sail) angle.

@@peterlelievre Many thanks for the reply. I have been giving this problem a little thought and, I think, as the wind angle moves away from zero one needs to quite quickly establish an angle of attack for the sail close to the best L/D value (perhaps 10 to 15 degrees depending on the aspect ratio of the rig) and that this should increase more gradually so the Clmax is reached for the beam reach situation. At 180 degrees having the tailplane at something approaching 90 degrees is needed to get the sail at about 90 degrees to the wind (though the shift of the centre of effort towards the 50% chord location will shift that requirement somewhat). As for the range of angles from beam reach to dead down wind it obviously depends on Cl & Cd characteristics well beyond the stall and that data is somewhat thin on the ground with Riegels' "Aerofoil Sections" being the only one that gives both for the full 0 to 360 degree range (and then, if I remember correctly, for a FW190 wing!)

Yes it has been tested if you go to the address mentioned in the description you can get the full story www.windthrusters.com/story.html

@@WindThrusters I got that document Thankyou, and the full size wing test platform, most excellent! Surprising the wing isn't taller. What are your thoughts on endplates? I'm currently testing a soft sail in a high aspect wing format, with panel stiffeners to keep the aero shape. Instead of end plating to the deck of the boat, I'm going to try endplating to the boom, and see how that goes, in light of windsurfers (and sail GP) that feel a turbo effect when the sail is closed to the deck. You've inspired me to innovate! 🤟

Yes, by all means use it. If you look at my channel you will see several videos of how it works, and how it can be constructed

You cannot go directly against the wind with a Flettner (Magnus) rotor

Oh yes, many times, it always goes to the u;pwind end of the pond! Quite fast.

Hello Hannu one way is to avoid going direct downwind but tack 45 degree either side where there is some thrust - I'm told fast catamarans do this also. You can also fit a mainsheet to prevent the rig rotating more than 180 degrees. Then on downwind the rig will be across the boat and providing the greatest drag. But if you do this you will have to gybe when the wind comes across to the other side.

@@WindThrusters That is what I thaught too. Have you come across with any good suggestions which airfoil for the main wing or the flap would work best on this kind of design?

@@hannurinne7898 Yes I used naca 0018 symmetrical 18 percent thick airfoil quite successfully. For the tail a flat sheet is probably ok as in the case of light aircraft. please email me from my website www.sailwings.net for further information

Hi - no it doesn't. They both need to be efficient. The water is much denser than the air - thats why the propeller is smaller. It works from the difference in velocities of the 2 mediums. Water stationary - air moving. You can find out more on this page windthrusters.com/headwind.html

Выводы сделаны давно th-cam.com/video/cjcPoIb4Ifg/w-d-xo.html

It works. Don't think would learn much more from windtunnel testing.

@@WindThrusters I just watched the entire series.. You're a genius!!

@@superkamehameha1744 Thanks!

Check out my website on www.windthrusters.com/story3.html

@@WindThrusters what about downwind, when the wind is comming from behind. I guess if you have wind blowing in your face you can have a micro controller adjusting the rudder and change the direction. But if you have wind from behind you will need some sort of engine to force the sail in locked sideways possition?

@@toroddlnning6806 you can constrain it from going more than 180 degrees. Or you can tack downwind

See windthrusters.com/story.html

Dear John - You can find most of the information on www.sailwings.net/siteindex.html

The music is "The Ride of the Valkeries" by Richard Wagner. Aluminium ladders are the most strong and light solution you can find anywhere. In France they have even been used to make ultralight aircraft.

A vertical axis turbine works well on a fixed land base. But to penetrate the wind you need something that does not produce too much drag. Each of the windblades are wings and they can produce as much as 20 times more lift than drag (as in planes) the lift produced is converted into rotary motion to drive the boat. with only a small drag penalty. A vertical axis turbine can never progress against the wind.

Yes, quite a good idea. Would depend upon the environment it would be used in.

The force needed to move the wing is very small because the wing pivots on its centre of effort - this is what you see on planes that have all-moving tail (stabiliser). However some degree of fine tuning is possible by altering the position of the "Throttle" lever. see my page www.windthrusters.com/story.html

They work amazingly well....i played with one years back on a 14ft sailing dingy, even thought it was not as big as i initially wanted to build, it drove the dingy as well as the conventional sail almost 3 times the sq/ft of the wing.......When i get the chance i intend to build another wingsail with a few tweaks i think worth trying out

Check out the link given = www.windthrusters.com/story3.html