Airfoil shape lofting keep aspect ratio

[janwillem]

I'm looking for a way to generate a loft of an airfoil shape that does not change throughout the section, but the chord is varying not linearly. When I create the loft the thickness varies linearly, creating weird shapes which would require me to add many different airfoils throughout the wing, but it would save a lot of time if it was possible to keep the aspect ratio of the shape constant

[matt]

I'm not 100% that I understand the question, but if you have made the shape as a single spline, you can copy the spline and set it to "proportional spline", and then just resize. If it's twisting when you loft, then you might try forcing it with a guide curve or use the connectors while lofting to line them all up to the same point.

There are people who understand the tools who might not understand the aero jargon. If you can simplify that a little, you might get better responses.

[bnemec]

I'm assuming that you are expecting the thickness to vary nonlinearly across the span, matching the nonlinearity of the chord?

This is just a guess, but the loft is solving for optimized curvature gradients rather than keeping constant aspect ratio of thickness/chord. I think because of that you will need to create cross-section sketches along the span to drive the loft, forcing it to maintain constant(ish) airfoil.

[retonny77]

I totally get where you’re coming from. Keeping the aspect ratio constant while varying the chord can be tricky.