2. 3. SHAPE AND SIZE OF THE MODEL PENETRATOR
The penetrators used in the present experiment are scale-models
of about one-fifth of the flight model, and are made of A7075 aluminum.
The shapes of penetrator models are shown in Figure 5. To investigate
the effect of the nose shape on penetration characteristics, two models
with two different nose shapes were prepared. One is of truncated conic
shape with an apex angle of 28.6° and a height of 6 cm (hereafter
abbreviated as STD, Figure 5a). Note that the ratio of the base diameter
to the original nose length is one-half. The other is of truncated ogive-nose,
which is more streamlined than the conic nose (hereafter abbreviated as
OGIVE, Figures 5b and 5c). The curvature of the ogive shape is approximately
expressed by the following equation,
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