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Forum: Main CFD Forum

November 17, 2011, 16:48

Replies: 10

Simple Question - or not?

Views: 1,955

Posted By truffaldino

I have also found a nice video on youtube on bl...

I have also found a nice video on youtube on bl succion airfoil used by J.Y. Cousteau as a sail which has 5 to 6 times max Cl of an ordinary sail:

http://www.youtube.com/watch?v=X5E0HDBM4xA

Forum: Main CFD Forum

November 17, 2011, 16:29

Replies: 10

Simple Question - or not?

Views: 1,955

Posted By truffaldino

Yes, this is a technique of sucking the boundary...

Yes, this is a technique of sucking the boundary layer on the top to delay separation. Some people say that blowing is even more effective.

You can take a look at a book by Bryan Thwaites on...

Forum: Main CFD Forum

November 17, 2011, 05:32

Replies: 10

Simple Question - or not?

Views: 1,955

Posted By truffaldino

Yes, with junkers flaps and slats we can reach...

Yes, with junkers flaps and slats we can reach such Cl's. Unfortunately x-foil analyzes only single-piece airfoil. There is another software by M.Drela (i do not remember the name) which is a...

Forum: Main CFD Forum

November 15, 2011, 06:25

Replies: 10

Simple Question - or not?

Views: 1,955

Posted By truffaldino

Thin airfoil is not necessary gives high lift: it...

Thin airfoil is not necessary gives high lift: it could stall at small aoa. The answer is really tricky. I would rather said: strongly cambered airfoil of an optimal thikness (depending on range of...

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