ARP Nachi

13.11

ARP Nachi

Cruiser | Japan | Tier VII

Tech Tree Position

General

Purchase priceSpecial

Hit Points39,200

Main Battery

IDS_PJGM063_203MM50_TYPE_C_RF_MOD5 х 2 pcs.

Rate of Fire4.29 shots/min.

Reload Time14 sec.

Rotation Speed5 deg./sec.

180 Degree Turn Time36 sec.

Firing Range15.58 km.

Maximum Dispersion131 m.

HE Shell203 mm HE Type0

Maximum HE Shell Damage3,300

Chance of Fire on Target Caused by HE Shell17 %

Initial HE Shell Velocity840 m./s.

HE Shell Weight125.85 kg.

AP Shell203 mm AP Type91

Maximum AP Shell Damage4,700

Initial AP Shell Velocity840 m./s.

AP Shell Weight125.85 kg.

Secondary Armament #1

127 mm/40 Type 89 on a Model A1 Mod.1 mount4 х 2 pcs.

Firing Range5.6 km.

Rate of Fire8 shots/min.

Reload Time7.5 sec.

HE Shell127 mm HE Type0

Maximum HE Shell Damage2,100

Initial HE Shell Velocity725 m./s.

Chance of Fire on Target Caused by HE Shell8 %

Torpedo Tubes

610 mm Triple4 х 3 pcs.

Rate of Fire0.79 shots/min.

Reload Time76 sec.

Rotation Speed25 deg./sec.

180 Degree Turn Time7.2 sec.

TorpedoType90 mod. 1

Maximum Damage17,233

Torpedo Speed62 knot

Torpedo Range9.99 km.

AA Defense

127 mm/40 Type 89 on a Model A1 Mod.1 mount4 х 2 pcs.

. . . Average Damage per Second40.4

. . . Firing Range5.01 km.

25 mm/60 Type 96 on a single mount26 х 1 pcs.

. . . Average Damage per Second46.8

. . . Firing Range2.49 km.

25 mm/60 Type 96 on a triple mount4 х 3 pcs.

. . . Average Damage per Second13.2

. . . Firing Range2.49 km.

25 mm/60 Type 96 on a twin mount8 х 2 pcs.

. . . Average Damage per Second21.6

. . . Firing Range2.49 km.

Maneuverability

Maximum Speed35 knot

Turning Circle Radius780 m.

Rudder Shift Time7.1 sec.

Concealment

Surface Detectability Range12.76 km.

Air Detectability Range6.56 km.

Battle Levels

12345678910

13.11

ARP Nachi

Cruiser | Japan | Tier VII

Tech Tree Position

General

Purchase priceSpecial

Hit Points39,200

Main Battery

IDS_PJGM063_203MM50_TYPE_C_RF_MOD5 х 2 pcs.

Rate of Fire4.29 shots/min.

Reload Time14 sec.

Rotation Speed5 deg./sec.

180 Degree Turn Time36 sec.

Firing Range15.58 km.

Maximum Dispersion131 m.

HE Shell203 mm HE Type0

Maximum HE Shell Damage3,300

Chance of Fire on Target Caused by HE Shell17 %

Initial HE Shell Velocity840 m./s.

HE Shell Weight125.85 kg.

AP Shell203 mm AP Type91

Maximum AP Shell Damage4,700

Initial AP Shell Velocity840 m./s.

AP Shell Weight125.85 kg.

Secondary Armament #1

127 mm/40 Type 89 on a Model A1 Mod.1 mount4 х 2 pcs.

Firing Range5.6 km.

Rate of Fire8 shots/min.

Reload Time7.5 sec.

HE Shell127 mm HE Type0

Maximum HE Shell Damage2,100

Initial HE Shell Velocity725 m./s.

Chance of Fire on Target Caused by HE Shell8 %

Torpedo Tubes

610 mm Triple4 х 3 pcs.

Rate of Fire0.79 shots/min.

Reload Time76 sec.

Rotation Speed25 deg./sec.

180 Degree Turn Time7.2 sec.

TorpedoType90 mod. 1

Maximum Damage17,233

Torpedo Speed62 knot

Torpedo Range9.99 km.

AA Defense

127 mm/40 Type 89 on a Model A1 Mod.1 mount4 х 2 pcs.

. . . Average Damage per Second40.4

. . . Firing Range5.01 km.

25 mm/60 Type 96 on a single mount26 х 1 pcs.

. . . Average Damage per Second46.8

. . . Firing Range2.49 km.

25 mm/60 Type 96 on a triple mount4 х 3 pcs.

. . . Average Damage per Second13.2

. . . Firing Range2.49 km.

25 mm/60 Type 96 on a twin mount8 х 2 pcs.

. . . Average Damage per Second21.6

. . . Firing Range2.49 km.

Maneuverability

Maximum Speed35 knot

Turning Circle Radius780 m.

Rudder Shift Time7.1 sec.

Concealment

Surface Detectability Range12.76 km.

Air Detectability Range6.56 km.

Battle Levels

12345678910

VII

Special

ARP Nachi — Japanese special premium Tier VII cruiser.

A heavy cruiser of the "Fleet of Fog". Modeled after the Imperial Japanese Navy's 2nd Myoko-class cruiser, Nachi. Harnessing an exceptional reconnaissance ability, she can track I-401 even during her silent runs. In combat, she acts as a spotter; calculating data for Myoko’s long-range engagements. Her Mental Model "Nachi" acts as "Treasurer" under Hiei’s "Student Council of the Fog". Having a rather placid personality, she is often swayed by her energetic colleague, Ashigara. This warship has been specially designed for World of Warships, and is modeled after Nachi as she appears in "ARPEGGIO OF BLUE STEEL -ARS NOVA- Cadenza".

Modules

	Rate of Fire (shots/min)	180° Turn Time (sec)	Maximum Dispersion (m)	Maximum HE Shell Damage (HP)	Chance of Fire on Target Caused by HE Shell (%)	Maximum AP Shell Damage (HP)		Research price (exp)	Purchase price ()
203 mm/50 3rd Year Type No.2 in a Model D turret	4.3	36	131	3,300	17	4,700		0	0

	Hit Points (HP)	Armor (mm)	Armor (mm)	Main Turrets (pcs.)	Secondary Gun Turrets (pcs.)	AA Mounts (pcs.)	Torpedo Tubes (pcs.)	Hangar Capacity (pcs.)		Research price (exp)	Purchase price ()
ARP Nachi	39,200	6	102	5	4	26/8/4/4	4			0	0

	Rate of Fire (shots/min)	Torpedo Tubes Reload Time (sec)	180° Turn Time (sec)	Maximum Damage (HP)	Torpedo Speed (knot)	Torpedo Range (km)		Research price (exp)	Purchase price ()
Type90 mod. 1	0.8	76	7.2	17,233	62	10		0	0

	IDS_SHIP_PARAM_SUO_INCREASE_DIST (%)	Maximum Firing Range (km)		Research price (exp)	Purchase price ()
Type7 mod. 1		0		0	0

	Maximum Speed (knot)		Research price (exp)	Purchase price ()
Propulsion: 132,000 hp	35		0	0

Compatible Upgrades

Slot 1
Slot 2
Slot 3
Slot 4

Player Opinion

Performance

Warning: The data presented in the AA Defense sidebar section may be incorrect.
Refer to the in-game Port screens for more useful data.

Nachi is a powerful being in "Arpeggio of Blue Steel" manga and its Ars Nova anime adaptation, with enormous speed, numerous matter annihilating weapons, incredible information gathering capabilities, and a protective field that is impenetrable to any weapon developed by humankind.

Tier VII ARP Nachi is a clone of the tech tree Myōkō, with accurate guns which fire some of the strongest HE shells at her tier, but poor turret traverse and weak AA.

The Ship

ARP Nachi has a top speed of 35 knots, one of the fastest at her tier, and she can outpace most opponents she will face. Her maneuverability is a mixed bag. Although her turning circle of 780 meters is rather large, her rudder shift of 7.1 seconds is one of the best at Tier VII. She will change directions quickly but needs space to complete her turns, which makes maneuvering in confined spaces difficult. Her concealment of 12.76 km is worse than Aoba, and leaves her more vulnerable to being spotted.

ARP Nachi mounts a standard cruiser Damage Control Party , which is active for 5 seconds with a 60 second cool down. Her second slot has a choice of consumables – Hydroacoustic Search  or Defensive AA Fire . Hydroacoustic Search is the optimal choice, to detect torpedoes at 3 km and ships at 4 km for 100 seconds. The Defensive AA Fire will provide a 50% boost to her continuous AA damage, but her weaker AA means the benefits are rather limited. In her third slot, ARP Nachi carries a Catapult Fighter  which launches a pair of fighters that patrol around the ship for up to 1 minute. Finally, she mounts a Submarine Surveillance  which will detect submerged submarines out to 5 km for 20 seconds.

Survivability

With 16 mm of plating, ARP Nachi’s bow and stern can bounce most heavy cruiser AP when sufficiently angled. However, she is vulnerable to all calibers of HE round, as well as AP overmatch from larger cruiser and all battleship guns. Her citadel runs from the forward turrets all the way to the aft turrets. Although much of it is below the waterline, there is a large raised section between her bridge and rear superstructure. With 102 mm of citadel armor, ARP Nachi’s citadel is vulnerable to cruiser AP at most ranges, although the presence of anti-torpedo bulges adds a small amount of extra protection. ARP Nachi has one of the largest health pools for a Tier VII cruiser.

Armament

ARP Nachi introduces a much-improved main battery from her predecessors. With ten 203 mm guns she has better DPM despite having a slower reload. These guns will become familiar to players, as they form the main armament of the rest of the line with the possible exception of Mogami. ARP Nachi has the usual improved dispersion common to Japanese 203 mm guns, so players can expect their shells to group closer together. With her larger main battery, ARP Nachi can land some seriously damaging salvos. A 15.6 km main battery range is decent, although ARP Nachi faces cruisers with much greater range when downtiered.

ARP Nachi has typical Japanese HE rounds, with some of the highest damage at her tier and a good fire chance per shell. Between her improved dispersion and high HE damage, ARP Nachi poses a serious threat to destroyers and even armored targets. Under ideal conditions ARP Nachi can set up to 7 fires a minute; while this does not match the fire starting potential of many light cruisers, ARP Nachi will cause more direct damage in between starting fires. Her AP rounds are best used against broadside cruisers, but they lack penetration compared to most 203 mm guns at Tier VII.

As expected, ARP Nachi mounts a powerful torpedo armament with two triple launchers on each side. A 10 km range is good, but ARP Nachi lacks the ability to safely launch them from stealth. These also have very restrictive launch arcs, with almost nonexistent forward angles. Her torpedoes are a poor choice as an offensive option, as positioning to attack a target will require showing an almost flat broadside. As such, her torpedoes are more suited for launching at pursuing enemies.

Anti-Air

ARP Nachi has fairly poor anti-air defenses. Her long-range weapons reach out to 5.8 km but her DPS and flak count are low. She lacks any medium-range weapons, and with her light AA only starting to fire at 2.5 km, they offer little deterrent to any carriers wanting to make an attack.

Anti-Submarine

ARP Nachi has access to an ASW airstrike, allowing her to attack submarines at up to 6 km away. Each strike drops two charges, and she can have 2 attacks ready to use with a 30 second reload. She can use her Submarine Surveillance  consumable to aid in spotting submerged submarines from safe distances. However, her weak armor and poor concealment mean she shouldn’t actively hunt them.

Battle Performance

ARP Nachi is poorly suited to close range combat, where her slow turret traverse means that tracking maneuvering targets is difficult. Rather she should stay at medium ranges, where she will be able to use her concealment to reach good firing positions and her improved dispersion will allow accurate attacks.

Players will need to use effective positioning and ammunition selection in order to compensate for ARP Nachi’s low base damage output. A well-aimed salvo can potentially cripple an enemy cruiser or destroyer, if the right ammunition is selected. For this reason, the Gun Feeder captain skill is recommended as it will allow players to more quickly switch ammunition types.

Although her torpedoes can be devastating, their slow speed and high reaction time mean that they cannot be relied on to regularly land serious hits. Their poor launch angles also mean they are dangerous to use at close ranges. But their long range and relatively slow speed make them good area denial weapons, and they can be effective weapons when kiting away or engaging targets which are closing to engage.

Pros:

• Guns are very accurate
• Large main battery
• Torpedoes have high damage
• Good fire chance for a heavy cruiser
• Has access to Hydroacoustic Search consumable
• Thick central deck armor can ricochet shells smaller than 457 mm.

Cons:

• Very weak armor for a heavy cruiser, often takes a large chunk of damage from anything fired at her.
• Vulnerable citadel
• Poor turret traverse
• Restricted torpedo launch arcs
• Poor AA defenses

Research

As a premium ship, ARP Nachi does not have any modules to replace.

Optimal Configuration

Upgrades

The recommended upgrades are:

• Slot 1: Main Armaments Modification 1
• Slot 2: Engine Room Protection
• Slot 3: Aiming Systems Modification 1 -or- Main Battery Modification 2
• Slot 4: Propulsion Modification 1 -or- Steering Gears Modification 1

Commander Skills

Recommended Commander Skills
Cost (points)	Attack				Defense
1	Grease the Gears +15% main battery traverse speed. ★★★	Swift Fish +5% torpedo speed.	Consumables Specialist −7.5% cooldown time of all Consumables except:  Damage Control Party   Repair Party .	Gun Feeder -40% time to switch shell type. ★★	Incoming Fire Alert Receive a warning of a salvo fired at your ship from more than 4.5km.	Last Stand The ship remains able to move and maneuver - slowly - while the engine or steering gears are incapacitated. ★★
2	Demolition Expert +1% chance of main and secondary HE shells causing a fire. +15% to the fragmentation damage area of HE ordnance fired at submarines. ★★	Fill the Tubes -10% torpedo tubes reload time.	Consumables Enhancements +10% action time of Hydroacoustic Search, Surveillance Radar, Smoke Generator, & Engine Boost.	Eye in the Sky Spotting Aircraft: • +2 charges • -50% cooldown time.	Priority Target The detection indicator will show the number of enemies targeting you with main battery. ★★★	Focus Fire Training In an active priority AA sector: •  +1.5% (to 5%) immediate damage. •  +25% continuous damage. •  +1 flak burst per salvo. −10% aircraft preparation time. −15% reload time of Airstrike armament..
3	Heavy HE and SAP Shells +10% HE and SAP shell damage. +15% ship detectability guns 149mm and up.	Pack a Punch +15% torpedo damage. +20% secondary battery range..	Adrenaline Rush -0.2% reload time of all armaments per 1% HP lost +0.2% AA continuous damage per 1% HP lost. ★★★	Heavy AP Shells +5% damage for AP shells 190mm and larger.	Superintendent +1 charge to all consumables. ★	Survivability Expert +450 HP per ship tier. ★★
4	Top Grade Gunner -10% reload time of secondary batteries If enemy ship is spotted within detectability range, -8% reload time of main battery. ★	Outnumbered If there are fewer allies than visible enemies within the ship's base main caliber firing range: +8% ship speed -10% main battery dispersion.	Radio Location Shows the direction to the nearest enemy ship. The enemy is alerted that a bearing has been taken.. ★	Inertial Fuse for HE Shells +25% armor penetration of HE shells Base fire chance reduced by half.	Concealment Expert -10% detectability range of the ship. ★★★	AAA & ASW Expert +25% continuous AA and flak damage. +15% damage inflicted by depth charges. While AAA is active: −50% ship consumables reload time..
Key: ★★★ - Extremely Useful      ★★ - Frequently Useful      ★ - Occasionally Useful     No stars - Not Useful

Consumables

ARP Nachi can equip the following consumables:

• Slot 1: Damage Control Party 
• Slot 2: Defensive AA Fire  – 3 charges or Hydroacoustic Search  – 3 charges
• Slot 3: Catapult Fighter  – 3 charges
• Slot 4: Submarine Surveillance  – 3 charges

Camouflage

As a premium ship, ARP Nachi comes with Default permanent camouflage and a set of permanent combat bonuses.

Signals

As this ship is basically a copy of the tech tree Myoko, the following recommended signals for maximum effectiveness are the same. However, as it is a copy, players can experiment with different signals combinations.

Recommended Signal Flags
Combat
Charlie Kilo +5% ship HP; +2.5% squadron HP.	Juliet Yankee Bissotwo -20% to flooding duration.	India Yankee -20% to fire duration.	Hotel Yankee -20% to damage received when ramming the enemy. +50% to damage dealt when ramming the enemy. ★	Victor Lima +1% chance for HE bombs and shells with a caliber above 160mm causing a fire. +0.5% chance for bombs and smaller shells causing a fire. +4% chance of torpedoes causing flooding. ★★★	India X-Ray +1% chance for HE bombs and shells with a caliber above 160mm causing a fire. +0.5% chance for bombs and smaller shells causing a fire. ★★★
Juliet Whiskey Unaone +15% chance of causing flooding.	Mike Yankee Soxisix +5% to secondary battery maximum firing range. -5% to maximum dispersion of secondary battery shells. -5% to secondary battery loading time.	November Echo Setteseven +5% continuous AA damage at all ranges. +5% damage from flak bursts. ★★	Sierra Mike +5% to the ship's maximum speed. ★★	November Foxtrot -5% reload time on all consumables. ★★	India Delta +20% to the amount of HP recovered when Repair Party  is used.
X-Ray Papa Unaone +10% action time of a Smoke Generator .	Sierra Bravo +10% action time of Hydroacoustic Search  -10% reload time of Defensive AA Fire .

Gallery

• 

  Render of Nachi’s mental model as she appeared in the Ars Nova Cadenza movie, and captain in the game.

• 

  Nachi alongside Ashigara as she appears in Ars Nova, her mental model being barely visible atop her bridge.

• 

  Nachi as she appears in the game, launching torpedoes from her starboard side.

Historical Info

Nachi (那智 Nachi)

Voiced by: Satomi Satou

Arpeggio of Blue Steel -Ars Nova-

In 2038, a mysterious fleet of warships, who have lurked around the world in the decades decades before, went on the offensive against humanity. Modelled after ships that appeared in World War II, but possessing weaponry far superior to those in humanity's possession and protected by an indestructible barrier immune to whatever we have to throw at them, humanity quickly loses control of the seas and our military forces are annihilated in the desperate battles against them. The result was a world where humanity's presence in the oceans is no more, with communication via the seas cut off and humans isolated from each other, blockaded by the "Fleet of Fog".

In 2054, a change became across the Fleet of Fog. The ships of the Fog, impersonal and faceless, started developing "Mental Models", human avatars capable of thinking in ways similar to human beings, with personalities unique to each Mental Model. One of these was the I-401, or, Iona, who made contact with Gunzō Chihaya to become his ship. Gunzō, with Iona and a small band of friends who now crew the I-401, as Blue Steel now seek to create a balance to this lopsided status quo with the Fleet of Fog, to bring a peace where humanity and the Fleet of Fog can happily coexist together.

Nachi is one of Hiei’s subordinates and Myōkō’s younger sister. She is Ashigara’s partner and serves as the sonar operator, detecting enemy vessels utilizing her sonar scanner.

History

Nachi was the second Myoko class heavy cruiser laid down by the Japanese Navy. Although incomplete, she was commissioned on 26 November 1928 and taken to Yokosuka to be examined by Emperor Hirohito as part of the Coronary Naval Review. Nachi returned to Kure in December where she was completed and made ready for service by April 1929. Once completed, Nachi and her three sister ships were assigned to the Sasebo Naval District and spent the early 1930’s conducting training and transport operations. From 1933 to 1937, Nachi underwent two modernizations and received numerous upgrades to her torpedo and secondary armament as well as additional anti-aircraft weapons.

In December 1941, Nachi and Myoko, now assigned to the 3rd Fleet, departed from Palau to conduct shore bombardment for the planned invasion of the southern Philippine Islands. Nachi and Myoko were later sent to support the invasion of Davao and Jolo islands. While anchored at Davao, Myoko was hit by a single bomb from land based aircraft and Nachi was subsequently appointed as flagship while Myoko returned to Japan for repairs.

In January of the following year, Nachi and her sister ships were sent to support the invasion of the Dutch East Indies. The heavy cruisers provided cover for the troops landing in the Celebes Islands and on Ambon before being tasked to eliminate the remaining Allied ships in the vicinity. On 27 February, Nachi and Haguro engaged the Dutch light cruisers De Ruyter and Java. The Japanese cruisers scored several torpedo hits on De Ruyter and Java and within hours, the light cruisers were abandoned and sank. Two days later, Nachi and her sister ships later engaged the heavy cruiser HMS Exeter. The English cruiser attempted to flee but was torpedoed by the destroyer Inazuma and quickly capsized. Following the success at Java Sea, Nachi returned to Sasebo, Japan, where she would undergo another refit in preparation for upcoming operations in the Aleutian Islands.

On 26 May 1942, Nachi departed Japan and led the 5th Fleet in support of the assault on the Aleutian Islands. The ship escorted convoys to and from the Aleutians through early 1943. On 26 March 1943, Nachi, and the cruisers Maya, Abukuma, and Tama, engaged the American cruisers USS Salt Lake City and USS Richmond. The two fleets exchanged fire for nearly four hours before the Japanese fleet disengaged and retreated. Nachi sustained several hits in the battle which caused minor damage and returned to Yokosuka for repairs. Nachi again returned to the Aleutians in July to aid in the evacuation of Japanese forces.

Nachi remained in Japanese waters for the remainder of 1943 and the first half of 1944. During this time, she again had her anti-aircraft armament increased. In October 1944, Nachi set sail for the Philippines and accompanied the battleships Fuso and Yamashiro at the Battle of Surigao Strait. After the battle, the ship collided with the heavy cruiser Mogami and was taken to Manila for emergency repairs. On 29 October, while still under repair, Nachi was attacked by American carrier based aircraft. A single bomb hit the ship during the attack which further set back her return to service. On 5 November, Nachi again came under attack from American strike aircraft. The ship sustained multiple bomb and torpedo hits which destroyed her bow and stern. Within hours, the ship sank in the waters off Corregidor Island.

Historical Gallery

• 

  Nachi photographed soon after her full-power trials in November 1928.

• 

  Nachi under attack by USN aircraft, 5 November 1944.

• 

  Nachi sinking, 5 November 1944. Note her blown-off stern and bow.

References

1. Japanese cruiser Nachi - Wikipedia
2. Myōkō-class cruiser - Wikipedia

Ship Change Log

See here for links to Update notes.

• Made available in Update 0.5.12 as part of the ARPEGGIO OF BLUE STEEL -ARS NOVA- event as a reward for completing special tasks.
• Update 0.6.2:
  • The position of the aircraft on the catapult was fixed.
• Update 0.6.12:
  • Detectability when firing main guns in smoke was changed to 7.6 km.
• Update 0.6.13:
  • Fire extinguishing time now 30 s instead of 60 s.
• Update 0.6.14:
  • The reload time of the Type 90 mod. 1 torpedoes was decreased from 82 to 76 s.
  • The appearance of the ship was improved using a special technology for improved rendering of thin elements.
• Update 0.7.1:
  • The ability to dismiss ARP commanders was added. However, if done so, they could not be recovered.
• Update 0.7.4:
  • The ability to sell the ship for 2,625,000 credits was added.
• Update 0.7.6:
  • The appearance of the ship was improved using a special technology for improved rendering of thin elements.
• Update 0.7.10:
  • The ranges of the Hydroacoustic Search consumable were unified - 4 km for detecting ships, 3 km for detecting torpedoes.
• Update 0.7.11:
  • Turret traverse speed increased from 4 to 5 degrees per second.
  • Accuracy of the main battery was improved to be similar to that of Zao.
• Update 0.8.10:
  • The ship's special visual style was made into a separate permanent camouflage with standard combat bonuses, and other camouflages were made able to be mounted. When camouflages are hidden through the additional content menu, the camouflage is removed.
• Update 0.9.0:
  • The ship was made into a Premium ship and received a profitability increase in credits. Economic bonuses were also applied to its permanent camouflage.
• Update 0.9.2:
  • Central deck armor was reinforced from 16 to 25 mm.
• Update 0.10.0:
  • The firing range of the secondary battery was increased to 5.6 km.
• Update 12.0:
  • Fixed a bug in the characteristics of the Depth Charge Airstrike armament:
    • Number of available flights of the Depth Charge Airstrike armament increased from 1 to 2.

Ships of Japan

Cruisers