Find Leading Edge of NACA-4DS Profile and Measure the Time

[Find Leading Edge of NACA-4DS Profile and Measure the Time]

Hi,

 

I had written a feature to do the same, but instead of maximizing the distance to the trailing edge I seeked the point on the airfoil where the tangent vector is normal to the line between the trailing edge and that point, by minimizing their dot product. This is the same method as in XFOIL, for instance.

 

So far so good... until now. My feature is not robust, I guess, and I can't open a file in which I included a calculation based on it. The software hangs, please see the snapshop attached. Maybe I should have posted this in other section of the forum, but it had something to do with this feature. If you could help me with this I would appreciate it. I would like to recover that file, if possible.

 

Unai

 

PS: No attachments, I have to learn first how to do it.

[ImageCurves as containers for arbitrary curves]

Hi,

 

I have found that in my example the offset direction is that of T.crossProduct(A), being T the unit tangent vector to the source curve and A the unit normal to the plane in which the offset is to be done, i.e.

• [1,0,0] for X - (Y,Z)
• [0,1,0] for Y - (Z,X)
• [0,0,1] for Z - (X,Y)

It has logic, and I understand it, but maybe the documentation could have been a bit more clear.

 

Unai

[ImageCurves as containers for arbitrary curves]

Hi,

 

This is my first question in the forum, let me first thank you for this wonderful software. And even more for giving it at no cost, I can't get any money for software at work.

 

I am having some difficulties with the Offset curve of an Image Curve. What is the direction of the offset when I choose one of the Offset Planes (X - (Y,Z), ...)? I don't understand the output and I haven't found the explanation in the documentation.

 

Regards,

Unai

 

PS: I have just checked that my doubt is not related to Image curves, but to Curves in general.