2011 rule changes - restrictions on rear crash structure 03 February 2011
To stop teams sculpting the shape of the deformable rear crash structure for aerodynamic gain (as per the example in the main drawing), the FIA have more strictly defined its height and positioning (dotted lines).
FIA Technical Regulation
From 15.5.3 - Furthermore, when viewed from the side, the lowest and highest points of the impact absorbing structure between its rear face and 50mm aft of the rear wheel centre line may not be separated vertically by more than 275 mm.
