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gptkbp:instance_of
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gptkb:cannon
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gptkbp:associated_with
|
gptkb:military_aircraft
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gptkbp:barrel_length
|
approximately 3 ft 6 in
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|
gptkbp:barrel_type
|
20x102 mm
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gptkbp:caliber
|
20 mm
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gptkbp:combat_role
|
anti-aircraft
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|
gptkbp:cooling_system
|
air-cooled
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|
gptkbp:crew
|
1 to 2 personnel
|
|
gptkbp:decommissioned
|
1970s
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gptkbp:designated_as
|
gptkb:US_Navy
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|
gptkbp:designed_by
|
1940s
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gptkbp:development
|
developed during World War II
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gptkbp:feed_system
|
belt-fed
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gptkbp:firing_mechanism
|
gas-operated
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gptkbp:first_introduced
|
gptkb:1944
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gptkbp:historical_significance
|
used in multiple conflicts
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|
https://www.w3.org/2000/01/rdf-schema#label
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20 mm M39 cannon
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gptkbp:is_similar_to
|
gptkb:Bofors_40_mm_gun
|
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gptkbp:legacy
|
influenced future autocannon designs
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gptkbp:length
|
approximately 5 ft 6 in
|
|
gptkbp:manufacturer
|
gptkb:General_Motors
|
|
gptkbp:modifications
|
various modifications made over time
|
|
gptkbp:mounting_options
|
flexible mount
|
|
gptkbp:muzzle_velocity
|
approximately 3,400 ft/s
|
|
gptkbp:notable_users
|
gptkb:US_military
|
|
gptkbp:operational_status
|
retired
|
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gptkbp:origin
|
gptkb:United_States
|
|
gptkbp:performance
|
high accuracy
|
|
gptkbp:production_years
|
1944 to 1950
|
|
gptkbp:range
|
approximately 1,500 m
approximately 6,000 m
|
|
gptkbp:rate_of_fire
|
up to 1200 rounds per minute
|
|
gptkbp:recoil
|
hydraulic recoil system
|
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gptkbp:related_to
|
gptkb:20_mm_Oerlikon_cannon
|
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gptkbp:reliability
|
high reliability
|
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gptkbp:replaced_by
|
gptkb:M61_Vulcan
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gptkbp:sights
|
iron sights
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gptkbp:successor
|
gptkb:M61_Vulcan
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gptkbp:type
|
gptkb:Racing
|
|
gptkbp:used_by
|
gptkb:United_States_Navy
|
|
gptkbp:used_in
|
gptkb:Korean_War
gptkb:Vietnam_War
|
|
gptkbp:uses
|
gptkb:aircraft
gptkb:naval_warfare
ground vehicles
|
|
gptkbp:weight
|
approximately 100 lbs
|
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gptkbp:bfsParent
|
gptkb:Northrop_F-89_Scorpion
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gptkbp:bfsLayer
|
6
|