Composite layup materials bend easily, so it is straightforward to fabricate geometries like plates and cylinders. These geometries are tractable because they require no warping or stretching of the layup materials. Alternately, layup materials do not warp, shear or stretch easily. Hence, it is more difficult to fabricate bulges and saddles that require in-plane membrane deformation. The mold and layup of the Red Rover's most complex curve succeeded despite the challenges.

From AstroboticBlogPhotos