Hi Folks,

  First, thank you for your time and your advice! I've been using Solidworks for several years now, but this error has me stumped.

What the goal is:

1. Extrude a curve of an airfoil to make a wing

2. Cut-extrude through the tips of the wing at an angle to allow wingtips to be mated at an angle to create a tip dihedral in an assembly later (please see image).

I'll attach a link to a video of me trying this process and the errors I get. I've also tried creating a solid body extruded through the wing (with the "merge" option deselected) in such a way that when I use Insert -> Feature -> Combine -> Subtract I'll get the angle at the ends of the wings, but the wing tips become strange polyhedrons with a thin skin wrapped around them. I can upload a video of that too, but I'd rather do this with a good old cut-extrude method like I'm used to.

  Thank you again!

       James

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2016-10-13_20-36-08.mp4 - Google Drive