A parameterized boomerang model made in Fusion 360.
If you import this into Fusion from http://a360.co/1MGZQ5X, there is a kind of spreadsheet in the "Modify" menu under "Change Parameters" where you can change all the angles, lengths, thickness etc. and the model will update accordingly.
This should be ready to fly and return if 3d printed. I haven't printed this particular model yet, though.