In 1934 Edward G . Budd patented a welded steel honeycomb sandwich panel from corrugated metal sheets and Claude Dornier aimed 1937 to solve the core-skin bonding problem by rolling or pressing a skin which is in a plastic state into the core cell walls.
12.
The ideal material would 1 ) be rigid, to prevent uncontrolled cone motions; 2 ) have low mass, to minimize starting force requirements and energy storage issues; 3 ) be well glass, hemp or bamboo fibers have been added; or it might use a honeycomb sandwich construction; or a coating might be applied to it so as to provide additional stiffening or damping.
