I am not really sure what to call these figures. They are not really winged or natural edged bowls because there is not enough bowl in the center. The reason for turning is to turn the wing shape and angel wing sells better for me than just wing...
You don't need power tools when you need to create a lot of grooves of the same width and distance from the edge, such as when making boxes or drawers. All you need is to make a pair of Matt Kenney's grooving planes...