I have been attempting to learn AE expressions by experimenting with an airplane asset from the game "Luftrausers". The creator, Paul Veer, "scale(d) the wings when the planes rotate, and because they're flat coloured silhouettes this makes them look 3D". I've uploaded an example here: http://gph.is/2sjpSKn
So far, I have split the comp into three layers (body, wingL and wingR) and parented the wings to the body. I used Effects > Slider Controls to isolate scale controls for each wing ("scaleX" and "scaleY"), locked scaleY for both, and parented scaleX for both to the rotation of the body.
The result: When rotating the body to 0°, the wings scale to 0; at 90°, the wings scale to 90 (great!)
However, I would like to have the wings at 90 when the body is rotated to 0°, as per the attached GIF...
Furthermore, I would LOVE to be able to then rotate the ship to -90°, and have the wings scale to 90 (as opposed to -90), like in the GIF.
Any help would be greatly appreciated! Please let me know if you need any more information / clarification.