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THE problems encountered in the design of longitudinally stiffened wing compression panels are summarized, and the extensive experimental investigations of the strength of such panels conducted by the NACA are reviewed. The development of design charts, based on the test data obtained in these investigations is described, and the importance of the proper selection of parameters for the chart is emphasized. Several illustrative examples are presented to show how the most suitable panel proportions for a particular application may be selected from the charts.

AFTER outlining the fundamental physical background for the release of atomic energy, the author shows that the high concentration of energy and the high cost and relative scarcity of atomic fuels mark them for use where there is a high premium on performance, rather than on direct cost per unit of power. This makes atomic energy attractive for aircraft propulsion, where it could combine high performance with large payload and long range. Chief obstacles in design of an atomic aircraft engine are development of light-weight shielding against deadly radiations; adequate cans to retain radioactive fission products; a pile capable of operating at high temperature and high thermal stresses; and a safe, flexible control mechanism.