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Glossary T

T

Tracer.

(t)

tsechisch — Czechoslovakian. (German)

T/D

Thickness to Diameter ratio. The Thickness to Diameter ratio refers to the thickness of the armour plate divided by the diameter of the projectile, or the diameter of the core in the case of a sub-calibre projectile. This is the crucial ratio in armour penetration for the types of projectiles and armour plate used during World War II. The armour plate thickness is determined perpendicular to the face of the armour, regardless of obliquity. For example, a 45mm thick armour plate hit by a 90mm projectile will have a T/D ratio of 0.5 whether the impact is at 70° to the projectile’s flight path or at 0°. The terms “overmatch” and “undermatch” refer to the T/D ratio. For example, a projectile is said to overmatch the armour plate if T/D<1 (i.e., the diameter of the projectile exceeds the thickness of the armour plate), and undermatch if T/D>1. Generally when a projectile overmatches a plate the projectile benefits, and vice versa.

TS

Treibspiegelgeschosse — discarding sabot projectile. This is a German APDS projectile. (German)

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