Unreal Great white shark(Blueprint)
Instead, spine's and head's bone's angles are directly changed by Transform(Modify) bone in the Animation Blueprint.
The rotation angle is derived as follows.
f: forward speed
y: yaw speed
dt: delta seconds
Let the length of the shark be L.
Let φ be the angle of the figure when approximating the body of a shark with a circular arc.
The rotation angle of the bone to be sought is the number
obtained by dividing φ by the number 8 of the spine and the head bone.