Vickers Mitrailleur 40 mm No.1
|These guns were acquired from the British gun manufacturer and dockyard Vickers-Armstrong Ltd. through their representative in the Netherlands N.V. Nederlandsch-Engelsche Technische Handel Maatschappij. Fully automatic, and for that reason, designated machinegun ("mitrailleur") in the RNethNavy. Widely used on variety of ships starting in the early 1930s, until replaced by the more effective Bofors 40 mm gun in the mid-1930s on new construction and existing ships (for example the cruiser Java in 1937-1938).
Similar, if not identical, to the "2-pounder" Mark II*C on Mark II*C pedestal mount, which were exported extensively by Vickers-Armstrong.
At least the ships of the Van Galen-class experienced serious problems with these guns. They were fitted on a platform that was too weak, which caused the guns to jam when used at high elevation. Makeshift measures were taken by stiffening the hull and platforms, and adding valves to the brake cylinders.
: The Royal Navy gave mountings and guns their own distinct Mark numbers. Particulars on British guns from [NWP], [CMP]
: From [BOS1].
|Pre-war advertisement of the 40 mm No.1|
|Gun specs |
|Gun type||Mitrailleur 40 mm No.1|
|Use ||Cruiser Java and Sumatra (until replaced by Bofors 40 mm).
Destroyers Van Galen, Witte de With, Banckert, Van Nes
Training ship Soerabaia
Minelayers Prins van Oranje, Gouden Leeuw
Minelayer Nautilus (removed by May, 1940).
|Purpose||Medium anti-aircraft defence|
|Bore length||L/40 (1,58 m)|
|Initial velocity||610 m/s|
|Rate of fire||50 - 85 rounds/minute|
|Range||4400 m @85 degrees elevation (effectively up to 2000 m)
7000 m against targets at sea level.
|Shell types||Fixed, High-Explosive rounds only|
|Shell weight||0,9 kg|
|Propellant charge||0,1 kg|
|Elevation||- / +85 degrees|
|Mount weight (total)||750 kg|
: From [ANT] unless otherwise noted.
: From [CAG].
: Ammunition was produced domestically at Staatsbedrijf der Artillerie-Inrichtingen. From [SAI].
|ANT||J. Anten et al "Hr.Ms. Kruisers 'Java' en 'Sumatra', published 2001|
|BOS1||Ph.M. Bosscher "De Koninklijke Marine in de Tweede Wereldoorlog", volume 1, published 1984.|
|CAG||M.A. Cageling "Onze strijdmacht ter zee, published 1938.|
|CMP||John Campbell "Naval Weapons of World War Two", published 1985, reprinted 2002.|
|NWP||Navweaps.com - 2-pdr [4 cm/39 (1.575")] QF Mark II|
|SAI||A.M.A. Goossens "Het Staatsbedrijf der Artillerie Inrichtingen", published online in 2007 at www.grebbeberg.nl|
|August 24, 2014||Updated page (all sections).|