edwilliams16 wrote: ↑Fri Dec 02, 2022 4:40 pm
We cant follow your procedure without the dat file. Please upload or paste it between code tags.
Did you try my python?
@edwilliams16 I am going to try the Python code you sent me...but want to learn some basics before I give it a go. In short, I separated the airfoil coordinates between the upper and lower surfaces. Then, once converted from a wire to a sketch file, I removed the line connecting leading to trailing edge, converted back to a wire, then wire to b-spline.
We are doing a validation test right now, making a sample wing section out of the plotted unwrap and airfoils and assembling them. All the measurements match up; we're about to assemble it.
"Testing leads to Failure, and Failure leads to Understanding" -Burt Rutan
Ended up creating my first macro to help speed up the initial scaling process, but bottom line is that I can now loft & unwrap each individual section without complications...and if fate would have it, I have that leading edge split line! What you see in the screen grab took about 20 minutes to do.
The light finally clicked on! Thanks @hammax and @edwilliams16 for your assistance!!
"Testing leads to Failure, and Failure leads to Understanding" -Burt Rutan
... some further experiments with a redrawn Sketcher-BSpline profile. Length 100
Trying to reproduce the mean camber line.
When scaling I noted for the first time, that the "weight circles" are dimensionless.
In your NACA653218_H file how did you get Sketch_up from BSpline_up? Did you fit by eyeball, or did you use tools? The resulting BSpline has many fewer knots.
... fitting by eyeball (overlay).
Creating a knotless BSpline from a straight line by converting it to BSpline and inserting control points.
Position control_points (LE and TE) and pull and manipulate their weight_circles.
Fixing it all by constraints and dimensioning.
The gag is how the dimensionless diameter of weight_circles controls curvature => playing with it.
Result is a clonable => 2axes scalable and smooth profile.
Angle of Attack by placement.