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Analysis of cylinder tests employing aluminum, steel, and copper cylinders of different thickness shows that Gurney Energy measurements have been affected by both the wall thickness and the material's dynamic properties. Experimental data for these tests and plate-push tests also show that the ratio of the initial free-surface velocity (1 st propulsion stage) to the final "steady-state" velocity obtained after the explosive gases have fully expanded (2 nd propulsion stage) can differ by a factor of two. The data show a clear dependence of this ratio upon the ratio of the inert material's thickness to the explosive's thickness. Phase transitions can also decrease propulsion efficiency by a significant margin.

Penetration results are reported for four low strength materials attacked by a non-precision, copper-shaped charge jet. The materials are methanol, Plexiglas, glycerol, and mild steel. The results are not entirely consistent with the recent compressibility-based predictions by B. S. Haugstad and O. S. Dullum [J. Appl. Phys. 52, 5066 (1981)] and by N. A. Zlatin and A. A. Kozhushko [Combust. Explos. Shock Waves USSR 16, 559 (1980)]. Methanol and Plexiglas have extraordinary penetration resistance due to a combination of shock wave formation, plastic flow resistance, vaporization, and decomposition. The more chemically stable glycerol has simpler behavior that is similar to mild steel.

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