Yes, it will impact holding less kinetic energy (and hence raw penetration value for the same given penetration “efficiency” or Krupp value) but it will: a) At long range be more prone to impact on the deck at a closer angle to the deck’s perpendicular reducing the effective thickness of armor to penetrate rather than bouncing off the thick belt (because there is more cross section of the target intersecting the impact direction which corresponds to the deck than the belt). The lower the energy which the shell retains, the lower its horizontal speed when its vertical speed is zero (so when the shell reaches its maximum altitude) and hence the steeper the angle of descent when the shell finally impacts. The other way around the lighter the shell, or the worse the air drag, the more energy would be dissipated. The better (lower) the air drag (shell’s shape), and the heavier the shell (for a given shell shape and volume) the less energy will be dissipated by friction with the air during flight. If you cannot follow iChase’s perfect explanation, then pick a book and study a bit of elementary physics… parabolic shots and so on.
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