My wording was poor. I meant both can’t be rectangular cross section. One or both must taper. Given the changing radius of the horizontal curve due to the waves, the amount of taper will vary everywhere and be quite difficult to make!
My wording was poor. I meant both can’t be rectangular cross section. One or both must taper. Given the changing radius of the horizontal curve due to the waves, the amount of taper will vary everywhere and be quite difficult to make!