Report presenting a comparison of normal load factors measured during combat operations with those measured during an NACA flight program conducted with fully instrumented service airplanes in operational training. Results indicated that for an equal number of maneuvers, normal load factors obtained from the NACA program are greater than those obtained during combat when based on the service-limit load factor.

Report presenting hydrodynamic planing lifts obtained in a free jet at speeds from 80 to 200 fps for four planing surfaces. The surfaces tested included a flat plate, a longitudinally curved model, a cylinder, and a hydro-ski with a complex-shaped bottom. Lift data was analyzed to show the effect of speed, planing-surface configuration, trim, and wetted-length-beam ratio at high speeds.

When a one-half ounce spherical charge of high explosive is detonated over a flat plane bounded by a 5 degree incline, the type of phenomenon encountered depends on the distance from ground zero to a beginning of the incline. If this distance is 48" the wave assumes a smooth contour on the plane. Detailed investigation of the shock velocity above the plane reveals that there is a pressure gradient along the shock front for a considerable region which replaces the usual triple point.