Hi Simba, does the attached version have what you want in it?

The cut does not quite run the entire length because one side is actually slightly larger than 0.42 mm in height, something like 0.4248.

The way I built the cutting surface is by using Fillet - I had to split the airfoil into 2 different surfaces and cut away a bunch of the area on the larger side, then with just 2 surfaces I was able to do surface/surface fillet with radius = 0.42 setting the "Constant Distance" option and that then built a cutting surface with I think the characteristics you want, where there's a distance of 0.42 units between the fillet rails. You can just delete the fillet and loft between the edges if you want a flat part there.

It will probably be somewhat difficult to find the proper cutting location on the surface with other tools.

- Michael

Hello Michael,

I cannot reproduce the creation of the fillet.

I split the shell into two parts but when I try to create the fillet as proposed, the calculation fails?!

What is it, I am missing?

S.

Hi simba - the fillet will get confused with the surfaces touching each other on the leading edge side. So to build the fillet you will need to cut away a large chunk of the wing and also probably use ShrinkTrimmedSrf on them as well so you have surfaces configured as in the attached version. You do that just temporarily to form the fillet, then bring the fillet back into the full original shape.

Note that when you do the fillet it will make a weird trim on the surfaces since the fillet does not quite run the entire length. But that's ok because you just want the fillet surface itself so just do Ctrl+C on the fillet surface, then go back to your original model and Ctrl+V to paste it in there then use the edges of the fillet for trimming the original airfoil.

- Michael