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POLISH 20MM FK-A WZ. 1938 AT / AA AUTO CANNON
The 20mm cannon model A was recoil-operated (short recoil). It could fire single or series shots. It was fed from 5-round box magazines (10-round magazines were in development). As a tank gun, it was fitted with a butt and a telescopic sight.
The ammunition was also developed in Poland, modeled after "long" Solothurn ammunition 20x138 mm (during trials, Solothurn bullets were used with Polish cartridges). A report from the nkm model A trials says however, that case length was 140 mm (it should be noted, that there is one report, that once in combat the captured German ammunition 2cm Kwk-38 was used, which was also identical as Solothurn). The following armour piercing rounds were developed:
- PWS - explosive round with a tracer and base fuze (APHE-T),
- PZS - ignition round with a tracer (API-T),
and practice rounds: PC and PCS (the last with a tracer).
For AA duties there were developed: an explosive round LWS with a tracer and a sensitive fuze, practice rounds: LC and LCS (the last with a tracer), and drum magazines 15- and 100-round.
Before the war, about 90,000 AP rounds were ordered.
Gun weight - 57.6 kg, barrel weight without muzzle brake - 20.2 kg, muzzle brake weight - 1 kg.
Gun length with muzzle brake - 2015 mm (without muzzle brake - 1895 mm), barrel length with muzzle brake - 1470 mm (without muzzle brake - 1350 mm), gun width with lock handles - 202,5 mm (without lock handles - 102,5 mm).
Max. range - about 7000 m. Max. bullet velocity - 820 - 858 m/s (depending on ammunition), theoretical rate of fire - 320 rds/min.
Armour penetration: thickness / distance
Carbonated armour plates, perpendicular: 20mm / 300m, 15mm / 500m
Carbonated armour plates, inclined at 30°: 20mm / 100m, 15mm / 400m
Homogeneous armour plates, perpendicular: 40 mm / 200m, 25mm / 800m, 15mm / 1500m.
Homogeneous armour plates, inclined at 30°: 25mm / 300m, 20mm / 500m, 15mm / 600m.
http://www.desura.com/groups/anti-air-lovers/image.....uto-cannon
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