- Posts: 87
- Joined: 13 Jun 2017 14:53
- Location: central Europe
for the exceptional penetration performance, I refered to penetration curves included Lilienthalreport 166 referring to "AP performance for those presently  in manufacture", which include the 10cm Pzgr. rot (15.6kg weight) curves.
original design V0 with L/66 rifle length: 1025m/s
revised V0 with L/68 rifled length: 1075m/s
My personal estimation on why the projectile was changed to 10cm Pzgr L/4.3 (18.0 kg weight) with a revised V0=1000m/s (original V0=965 m/s) is related to the higher V0 of this anti tank gun. The curves for the 10cm Pzgr rot end at ca. 950m/s. Because the explosive cavity is rather large and the cap relatively small, I´d expect that higher velocities might also induce a higher probability of projectile deformation and / or break up. Thus the change towards a projectile with thicker cap and/or smaller high explosive cavity will entail satisfactory function (=penetration intact) while negotiating higher impact stress.
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