Fig. 7. Water height h and altitude Z of the rocket according to textbook gray and the present black analyses using conditions from Ref. 2 with Pi=3.4 bars. In b and c the velocities are plotted on a logarithmic time scale to stretch the shorter times. The horizontal line in b is given by Eq. 24 , and the initial slope in c is d2Z /dt2 P /m.
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