Loft is not executed correctly

[nectarietotan]

Hi! I have a problem, I'm designing a glider wing, now I'm working at the dihedral, but I have a problem when I want to connect the 2 ends of the section(one end is tilted at 10 degrees and the other is a scaled from the first one and placed perpendicular on the xy plane) the loft is made, but when I verify and offset a plane at the middle of the body and split it, some features are deformed, I tried lofting in 2 ways: 1.lofting profiles made by sketches, 2. lofting faces of bodies extruded from the sketches, the result is  similar.

[davebYYPCU]

Way too many spline points.  

The longer the wing the more sag / shrinkage you will see.

Imagine wrapping a towel over those two frames there will be sag.

Fix it with spars and leading / trailing edge rails.

You may do better with Sweep with Path and Guide Rail (TE and LE) Scale and full extents.

Might help….

[nectarietotan]

I know what structure I will have for the wing, later the wing will be split in ribs, but I want the 3d model to be correct....can I convert the splines somehow?

[davebYYPCU]

I use Sweep, for “Same airfoil” otherwise 

trace a clean airfoil with top and bottom 4 point spline for Lofting.  
use airfoil as Rail, TE and LE with Main spar and hinge spars as profiles (straight lines) usually tidy it up.

Might help…..