Guns
used in  the
 Pacific during
World War Two
................................

20mm Gun

STATISTICS
Year of Construction: 1940
Bore:  20mm
Weight of gun: 64- 68 kg / 141 - 150lbs
Weight of barrel: 21.8 kg / 48 lbs
Length of gun: 2210mm/ 87 ins
Length of bore: 1400mm/ 55.118 ins
Weight of projectile:varies in references from 0.12kg/ 0.27lbs to 0.24kg/0.53lbs/8.5oz.
Max. Range: 4390m/ 4800 yds ...........................................Max. Effective Range: 914m/1000 yds
Ceiling: 3050m /10,000 ft at 90° .........................................Max. Elevation: 90°
Ammunition Types: Ball, Tracer, HE, and HE Incendiary......Magazine: Drum type, holds 60 rounds
Rate of Fire:Varies in references from an original 265 rounds/min to a later 450 rounds/min (round spring)
to 650 rounds/min (flat spring)
Crew: 5 to 7 (Gunner, Trunnion Operator, Range(Sight) Setter if gyroscopic sight, two Loaders per barrel)
(Trunnion Operator raises or lowers trunnion column on pedestal mount to accommodate position of gunner. The Slater had fixed tripod type mounts). Gun is aimed and elevated manually.
 

STATISTICS

Year of Construction: 1942......................................... Bore: 40mm
Weight of gun: 522kg / 1150lbs ................................. Weight of barrel: 91.6kg/ 202 lbs
Length of gun: 3,779.5mm/ 148.8 ins. ........................ Length of bore: 2,250mm/ 88.853 ins. (56 calibers)
Wt. of projectile: 0.9kg / 1.985 lbs ............................ Max. Range (Anti-Ship): 10.1km / 11,000 yds at 42° elevation
Max. Effective Range: 2.7km /3,000 yds ................... Max. Elevation: 90°
Ceiling (Anti-Air): 6.950 km/ 22,800 ft./ 7,600 yds at 90° elevation
Rate of Fire: 120 - 160 rounds/min/barrel; governed by the speed of loading 4 round clips.
Crew: Twin - 7; Pointer, Trainer, Gun Captain, 4 Loaders (2/Barrel) 

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