Here is the chair that I usually make in white oak. This is a perfect wood for so many reasons and works really well for making this back support. The back support is made from a steam bent blank that is 1-1/4" thick, 3-1/2" high, and 27-1/2" long. This takes a tremendous amount of force to bend and a precise setup.
So, when a client wanted this in walnut I wondered if it was possible and just had to see how far I could stretch the possibilities. Before I go into explaining how I got the setup just right to achieve this bend here is a video to show that it is possible.
I will follow up with some photos of the part after the bending.