Difference between revisions of "100 mm/47 O.T.O. Mod. 1928 (100 mm)"

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== Description ==
 
== Description ==
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''Write an introduction to the article in 2-3 small paragraphs. Briefly tell us about the history of the development and combat using the weaponry and also about its features. Compile a list of air, ground, or naval vehicles that feature this weapon system in the game.''
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<!-- ''Write an introduction to the article in 2-3 small paragraphs. Briefly tell us about the history of the development and combat using the weaponry and also about its features. Compile a list of air, ground, or naval vehicles that feature this weapon system in the game.'' -->
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'''100 mm/47 O.T.O. Mod. 1928''' is a secondary multi-purpose gun used in an open twin-gun turrets on a number of Italian cruisers. Being a relatively old design it struggles with rate of fire and the damage inflicted by an individual shells. But overall it offers an important component of the air-defence for the cruisers, being able to engage bombers even a few kilometers up when controlled by the AI gunners.
 +
[[File:100 mm-47 O.T.O. Mod. 1928.jpg|thumb|right|Triple-turret battery of the [[100 mm/47 O.T.O. Mod. 1928 (100 mm)|100 mm/47 O.T.O. Mod. 1928]] on [[RN Eugenio di Savoia]]]]
  
 
=== Vehicles equipped with this weapon ===
 
=== Vehicles equipped with this weapon ===
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* {{Specs-Link|it_cruiser_bartolomeocolleoni_1940}}
 
* {{Specs-Link|it_cruiser_bartolomeocolleoni_1940}}
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* {{Specs-Link|it_cruiser_montecuccoli}}
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* {{Specs-Link|it_cruiser_eugenio_di_savoia}}
 
* {{Specs-Link|it_cruiser_garibaldi_class_abruzzi}}
 
* {{Specs-Link|it_cruiser_garibaldi_class_abruzzi}}
−
* {{Specs-Link|it_cruiser_eugenio_di_savoia}}
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* {{Specs-Link|it_cruiser_trento}}
 
* {{Specs-Link|it_cruiser_zara_class_pola}}
 
* {{Specs-Link|it_cruiser_zara_class_pola}}
−
* {{Specs-Link|it_cruiser_montecuccoli}}
 
−
* {{Specs-Link|it_cruiser_trento}}
 
 
* {{Specs-Link|it_cruiser_zara_class}}
 
* {{Specs-Link|it_cruiser_zara_class}}
  
 
== General info ==
 
== General info ==
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''Tell us about the tactical and technical characteristics of the cannon or machine gun.''
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<!-- ''Tell us about the tactical and technical characteristics of the cannon or machine gun.'' -->
  
 
=== Available ammunition ===
 
=== Available ammunition ===
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=== Comparison with analogues ===
 
=== Comparison with analogues ===
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''Give a comparative description of cannons/machine guns that have firepower equal to this weapon.''
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<!-- ''Give a comparative description of cannons/machine guns that have firepower equal to this weapon.'' -->
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Comparing to the foreign equivalents of a similar calibre the 100 mm/47 O.T.O. Mod. 1928 is rather underwhelming weapon, showing its age when matched against more modern counterparts. For starters it lacks {{Annotation|HE-VT|High-explosive variable time fuse shell}} shells that its British and Soviet equivalents have an access to, and thus it offers a much lower anti-air potential with its plain {{Annotation|HE-FT|High-explosive with time fuse}}. Explosive filler in the high explosive shells is also one of the lowest, thus being limited in the amount of damage done. This is made worse by a very low rate of fire (owning it to a fully manual operation of the gun by the crew), low targetting speed and a low muzzle velocity.
 +
 
 +
There are two upsides however: Unusually for the calibre (and owning it to the dated design) gun comes with a dedicated {{Annotation|APHE|Armor-piercing high explosive shell}} that can penetrate hulls of most of destroyers and even a number of cruisers, though a low number of guns and the inaccuracy of the AI gunners against bluewater ships make it an unlikely mean of sinking enemy warships. The other saving grace of these guns is their long range, similarly to the foreign equivalents, what allows them to harass enemy bombers long before they get ready to drop their bombs, thus discouraging enemy from attempting engagement.
 +
 
 +
==== HE ====
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{| class="wikitable sortable" style="text-align:center" width="100%"
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|-
 +
! colspan="2" rowspan="2" |Cannon
 +
! rowspan="2" |Sample Ship
 +
! rowspan="2" |Ammo
 +
! rowspan="2" |Calibre<br>(mm)
 +
! rowspan="2" |Muzzle Velocity<br>(m/s)
 +
! rowspan="2" |Sustained rate of fire<br>(rounds/min)
 +
! colspan="2" |Targeting speed<br>(°/s)
 +
! rowspan="2" |TNT Equivalent<br>(kg)
 +
! colspan="2" |Penetration<br>@ 0° Angle of Attack (mm)
 +
|-
 +
!Horizontal!!Vertical!!1,000 m!!5,000 m
 +
|-
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|[[File:Kingdom Italy flag.png|link=|25x25px]]
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| 100 mm/47 O.T.O. Mod. 1928 (100 mm)
 +
| [[RN Eugenio di Savoia]] || HE || 100 || 850 || 9.6 || 11 || 6 || 1.3 || 17 || 17
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|-
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|[[File:Britain flag.png|link=|25x25px]]
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| [[4 inch/45 Mark XVI (102 mm)]]
 +
| [[HMS Arethusa]] || HE || 102 || 811 || 10 || 20 || 6 || 8.5 || 20 || 20
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|-
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|[[File:Germany flag.png|link=|25x25px]]
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| [[10.5 cm SK C/32 (105 mm)]]
 +
| [[Emden]] || HE || 105 || 875 || 15 || 6.8 || 6.8 || 1.55 || 20 || 20
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|-
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|[[File:USSR flag.png|link=|25x25px]]
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| [[100 mm/70 SM-5-1 (100 mm)]]
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| [[Chapayev]] || HE || 100 || 1000 || 15 || 14 || 14 || 1.94 || 24 || 24
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|-
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|[[File:USSR flag.png|link=|25x25px]]
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| [[100 mm/56 B-34 (100 mm)]]
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| [[Kirov]] || HE || 100 || 900 || 15 || 21 || 17 || 1.95 || 24 || 24
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|-
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|[[File:Japan flag.png|link=|25x25px]]
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| [[100/65 mm Type 98 mod A (100 mm)]]
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| [[IJN Akizuki]] || HE || 100 || 950 || 15 || 12 || 16 || 0.95 || 13 || 13
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|-
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|}
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 +
==== AP and SAP ====
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{| class="wikitable sortable" style="text-align:center" width="100%"
 +
|-
 +
! colspan="2" rowspan="2" |Cannon
 +
! rowspan="2" |Sample Ship
 +
! rowspan="2" |Ammo
 +
! rowspan="2" |Calibre<br>(mm)
 +
! rowspan="2" |Muzzle Velocity<br>(m/s)
 +
! rowspan="2" |Sustained rate of fire<br>(rounds/min)
 +
! colspan="2" |Targeting speed<br>(°/s)
 +
! rowspan="2" |TNT Equivalent<br>(kg)
 +
! colspan="2" |Penetration<br>@ 0° Angle of Attack (mm)
 +
! colspan="2" |Penetration<br>@ 60° Angle of Attack (mm)
 +
|-
 +
!Horizontal!!Vertical!!1,000 m!!5,000 m!!1,000 m!!5,000 m
 +
|-
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|[[File:Kingdom Italy flag.png|link=|25x25px]]
 +
| 100 mm/47 O.T.O. Mod. 1928 (100 mm)
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| [[RN Eugenio di Savoia]] || APHE || 100 || 850 || 9.6 || 11 || 6 || 0.82 || 129 || 67 || 52 || 29
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|-
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|[[File:Britain flag.png|link=|25x25px]]
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| [[4 inch/45 Mark XVI (102 mm)]]
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| [[HMS Arethusa]] || SAP || 102 || 811 || 10 || 20 || 6 || 0.6 || 102 || 64 || 43 || 27
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|-
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|}
  
 
== Usage in battles ==
 
== Usage in battles ==
−
''Describe the cannon/machine gun in the game - its distinctive features, tactics of usage against notable opponents. Please don't write a "guide" - do not impose a single point of view, but give the reader food for thought.''
+
<!-- ''Describe the cannon/machine gun in the game - its distinctive features, tactics of usage against notable opponents. Please don't write a "guide" - do not impose a single point of view, but give the reader food for thought.'' -->
 +
These guns are used exclusively as secondaries and unlike a number of other secondary guns on cruisers - they are best left for the AI to control at all times, as the guns simply lack both: punching power and/or rate of fire to be worth manual control, maybe with exception of the [[Zara (Family)|Zara-class]] where three-turret broadside is just-about enough to save the day in a specific circumstances. These guns should be primarily thought of as a psychological warfare against enemy airplanes - they offer just enough fire to look discouraging, while also being able to score a random hit every now and then. They are by no means reliable, but still better than having no long-range protection (an issue with which Japanese warships struggle throughout the research tree).
  
 
=== Pros and cons ===
 
=== Pros and cons ===
−
''Summarise and briefly evaluate the weaponry in terms of its characteristics and combat effectiveness. Mark pros and cons as a list.''
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<!-- ''Summarise and briefly evaluate the weaponry in terms of its characteristics and combat effectiveness. Mark pros and cons as a list.'' -->
  
 
'''Pros:'''
 
'''Pros:'''
  
−
*
+
* Good APHE shell for the calibre
 +
* Long engagement range
  
 
'''Cons:'''
 
'''Cons:'''
  
−
*
+
* Poor damage potential (small explosive fillers in HE shells, low rate of fire, poor muzzle velocity)
 +
* Lack of HE-VT shells
 +
* Low targeting speed
  
 
== History ==
 
== History ==
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== External links ==
 
== External links ==
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''Paste links to sources and external resources, such as:''
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<!-- ''Paste links to sources and external resources, such as:''
 
* ''topic on the official game forum;''
 
* ''topic on the official game forum;''
−
* ''other literature.''
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* ''other literature.'' -->
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* [[wikipedia:Škoda 10 cm K10|Škoda 10 cm K10]]
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* [http://www.navweaps.com/Weapons/WNIT_39-47_m1924.php <nowiki>[NavWeaps]</nowiki> Italy 100 mm/47 (3.9") Models 1924, 1927 and 1928]
  
 
{{Italy naval cannons}}
 
{{Italy naval cannons}}
  
 
[[Category:Naval cannons]]
 
[[Category:Naval cannons]]

Revision as of 15:18, 8 January 2023

Description

100 mm/47 O.T.O. Mod. 1928 is a secondary multi-purpose gun used in an open twin-gun turrets on a number of Italian cruisers. Being a relatively old design it struggles with rate of fire and the damage inflicted by an individual shells. But overall it offers an important component of the air-defence for the cruisers, being able to engage bombers even a few kilometers up when controlled by the AI gunners.

Triple-turret battery of the 100 mm/47 O.T.O. Mod. 1928 on RN Eugenio di Savoia

Vehicles equipped with this weapon

General info

Available ammunition

Penetration statistics
Ammunition Type of
warhead 		Penetration @ 0° Angle of Attack (mm)
100 m 1,000 m 2,000 m 3,000 m 4,000 m 5,000 m
100 mm HE Dirompente HE 17 17 17 17 17 17
100 mm APHE Perforante APHE 150 129 109 93 78 67
100 mm HE-TF Contro-aerea HE-TF 17 17 17 17 17 17
Shell details
Ammunition Type of
warhead 		Velocity
(m/s) 		Projectile
mass (kg) 		Fuse delay
(s) 		Fuse sensitivity
(mm) 		Explosive mass
(TNT equivalent) (g) 		Ricochet
0% 50% 100%
100 mm HE Dirompente HE 850 13.2 0 0.1 1,300 79° 80° 81°
100 mm APHE Perforante APHE 850 13.8 0.005 6 820 47° 60° 65°
100 mm HE-TF Contro-aerea HE-TF 850 13.2 0 0.1 1,300 79° 80° 81°

Comparison with analogues

Comparing to the foreign equivalents of a similar calibre the 100 mm/47 O.T.O. Mod. 1928 is rather underwhelming weapon, showing its age when matched against more modern counterparts. For starters it lacks HE-VT shells that its British and Soviet equivalents have an access to, and thus it offers a much lower anti-air potential with its plain HE-FT. Explosive filler in the high explosive shells is also one of the lowest, thus being limited in the amount of damage done. This is made worse by a very low rate of fire (owning it to a fully manual operation of the gun by the crew), low targetting speed and a low muzzle velocity.

There are two upsides however: Unusually for the calibre (and owning it to the dated design) gun comes with a dedicated APHE that can penetrate hulls of most of destroyers and even a number of cruisers, though a low number of guns and the inaccuracy of the AI gunners against bluewater ships make it an unlikely mean of sinking enemy warships. The other saving grace of these guns is their long range, similarly to the foreign equivalents, what allows them to harass enemy bombers long before they get ready to drop their bombs, thus discouraging enemy from attempting engagement.

HE

Cannon Sample Ship Ammo Calibre
(mm) 		Muzzle Velocity
(m/s) 		Sustained rate of fire
(rounds/min) 		Targeting speed
(°/s) 		TNT Equivalent
(kg) 		Penetration
@ 0° Angle of Attack (mm)
Horizontal Vertical 1,000 m 5,000 m
Kingdom Italy flag.png 100 mm/47 O.T.O. Mod. 1928 (100 mm) RN Eugenio di Savoia HE 100 850 9.6 11 6 1.3 17 17
Britain flag.png 4 inch/45 Mark XVI (102 mm) HMS Arethusa HE 102 811 10 20 6 8.5 20 20
Germany flag.png 10.5 cm SK C/32 (105 mm) Emden HE 105 875 15 6.8 6.8 1.55 20 20
USSR flag.png 100 mm/70 SM-5-1 (100 mm) Chapayev HE 100 1000 15 14 14 1.94 24 24
USSR flag.png 100 mm/56 B-34 (100 mm) Kirov HE 100 900 15 21 17 1.95 24 24
Japan flag.png 100/65 mm Type 98 mod A (100 mm) IJN Akizuki HE 100 950 15 12 16 0.95 13 13

AP and SAP

Cannon Sample Ship Ammo Calibre
(mm) 		Muzzle Velocity
(m/s) 		Sustained rate of fire
(rounds/min) 		Targeting speed
(°/s) 		TNT Equivalent
(kg) 		Penetration
@ 0° Angle of Attack (mm) 		Penetration
@ 60° Angle of Attack (mm)
Horizontal Vertical 1,000 m 5,000 m 1,000 m 5,000 m
Kingdom Italy flag.png 100 mm/47 O.T.O. Mod. 1928 (100 mm) RN Eugenio di Savoia APHE 100 850 9.6 11 6 0.82 129 67 52 29
Britain flag.png 4 inch/45 Mark XVI (102 mm) HMS Arethusa SAP 102 811 10 20 6 0.6 102 64 43 27

Usage in battles

These guns are used exclusively as secondaries and unlike a number of other secondary guns on cruisers - they are best left for the AI to control at all times, as the guns simply lack both: punching power and/or rate of fire to be worth manual control, maybe with exception of the Zara-class where three-turret broadside is just-about enough to save the day in a specific circumstances. These guns should be primarily thought of as a psychological warfare against enemy airplanes - they offer just enough fire to look discouraging, while also being able to score a random hit every now and then. They are by no means reliable, but still better than having no long-range protection (an issue with which Japanese warships struggle throughout the research tree).

Pros and cons

Pros:

  • Good APHE shell for the calibre
  • Long engagement range

Cons:

  • Poor damage potential (small explosive fillers in HE shells, low rate of fire, poor muzzle velocity)
  • Lack of HE-VT shells
  • Low targeting speed

History

The Austro-Hungarian Empire began to lay down plans for a much expanded naval force in the early 1900s. No longer content with a coastal defense force, they wanted to have control over the Adriatic Sea. The change was influenced by the politics of Marinekommandant (Chief of the Navy) Rudolf Montecuccoil and crown prince Archduke Franz Ferdinand who viewed Italy as a threat, along with the new railway linking their ports at Trieste (present-day Italy) and the Dalmatian coastline (present-day Croatia) to the rest of the Empire. The new fleet expansion program led to orders for a new cannon to arm their destroyers and scout cruisers leading to the Škoda K 10 first developed in 1907 and adopted in 1910. After World War I ended, the Austro-Hungarian Empire was dismantled by the Allied Powers. This dismantling included the navy with Italy getting the K 10 guns on the Brindisi and Venezia which were ships ceded from the Austro-Hungarian Navy as war reparations.

The Italians were so enamoured with the design, they began to produce the design locally through OTO which resulted in a variety of different variants of the design. The O.T.O. Mod.1928 was a dual-mount anti-aircraft variant with electrically powered adjustable trunnions, rope rammers and mechanized spring, and a loose liner. Despite being intended for anti-aircraft use, the gun was too slow for this role, particularly if a ship was rolling and it was instead more suited for barrage fire. The RN Balzano, Condottieri-class, RN San Giorgio, and Zara-class cruisers all used these guns. They were also used on the Conte di Cavour-class dreadnoughts. The Soviet Navy also used this gun as the Minizini named for the developer of the duel mount Italian Commandante Minizini.

Media

Excellent additions to the article would be video guides, screenshots from the game, and photos.

See also

External links


Italy naval cannons
20 mm  20 mm/65 Breda · 20 mm/70 Oerlikon 3S · 20 mm/70 Scotti-Isotta Fraschini mod.1939
37 mm  37 mm/54 Breda Mod.32 · 37 mm/54 Breda Mod.38 · 37 mm/54 Breda Mod.39
40 mm  40 mm/39 Vickers-Terni mod.1915/1917 · 40 mm/39 Vickers-Terni mod.1915/1917, Modif.1930 · 40 mm/70 Breda-Bofors type 107
65 mm  65 mm/64 Ansaldo-Terni Mod.1939
76 mm  76 mm/40 Armstrong mod.1897/1910 · 76 mm/40 Armstrong mod.1897/1912 · 76 mm/40 Ansaldo mod.1917 · 76 mm/45 Schneider mod.1911 · 76 mm/50 Vickers mod.1909 · 76 mm/62 OTO-Melara Compact · 76-mm/62 SMP 3
90 mm  90 mm/50 Ansaldo model 1939
100 mm  100 mm/47 O.T.O. Mod. 1928 · 100 mm/47 O.T.O. Mod. 1937
120 mm  120 mm/45 Canet-Schneider-Armstrong mod.1918-19 · 120 mm/50 Armstrong model 1909 · 120 mm/45 O.T.O. Mod. 1926 · 120 mm/50 Ansaldo mod.1926 · 120 mm/50 O.T.O. Mod.1936
135 mm  135 mm/45 O.T.O. Mod. 1937
152 mm  152 mm/45 Schneider mod.1911 · 152/53 mm Ansaldo mod.1926 · 152/53 mm O.T.O. Mod.1929
203 mm  203 mm/50 Ansaldo mod.1924 · 203 mm/53 Ansaldo mod.1927
305 mm  305 mm/46 Armstrong model 1909 · 305 mm/46 Vickers model 1909
320 mm  320 mm/44 OTO model 1934 · 320 mm/44 Ansaldo model 1936
  Foreign:
20 mm  2 cm/65 Flakvierling 38 (Germany) · 20 mm/70 Oerlikon Mk.II (USA)
40 mm  Bofors L/60 Mark 1 (USA) · Bofors L/60 Mark 3 (USA)
76 mm  76 mm/50 Mk.33 (USA)
127 mm  127 mm/38 Mk.12 (USA)

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