How to create a turbofan exhaust mixer in CATIA V5

Steps below:

  1. Step 1:

    Enter GSD, and create a circle in sketcher.

  2. Step 2:

    Offset a plane from the plane you created the circle with. Enter sketcher on the new plane and create the lobed shape shown. Dimensions aren't critical, since this isn't a technically correct mixer.

  3. Step 3:

    Model should look like this:

  4. Step 4:

    Extrude each sketch a little bit. The dimensions don't matter, because they'll be used as tangency supports later.

  5. Step 5:

    Create a multi-section surface with the two sketches. Use the extrusions as Supports for tangency. Make sure the Closing Points are correct.

  6. Step 6:

    Hide the extrusions and sketches. Thicken the multisection surface a little bit.

  7. Step 7:

    Enter sketcher on a new plane 90 degrees from the first 2 planes. Make the sketch shown. I kind of guessed on the dimensions and made it look right.

  8. Step 8:

    Make a 360 degree rotational extrusion with the sketch.

  9. Step 9:

    Split the mixer with the rotated extrusion and cut off the back part.

  10. Step 10:

    You should end up with something like this:

  11. Step 11: