i really have no clue on how to rig this model. hope you guys have some tricks or already knew about this.
add a base bone, animate rotation.
add another bone with trackto to constraint to bone.003
add another bone, unparent it, move it as in picture. Add trackto constraint to bone.001.
Note: Of course, bone.003 is just "one" wing. Do the same on the other side or use mirroring.
Lenghten Bone.001 to get a "lower" wing movement.
Animation from side view:
*** UPDATE ***
Moonboots (formerly known as Superman) was right as he stated in the comments that my rig has a dependency circle.
So i tried to fix it:
new blend file:
Before: Bone1 hat trackto to bone3. Bone3 hat trackto to bone1. That's bad. -> dependency circle
I know added another bone.
Now Bone1 has trackto bone3. new Bone 4 has trackto Bone1 Bone3 has no constraints.