Difference between revisions of "B7A2"

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{{Specs-Card|code=b7a2}}
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{{About
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| about = Japanese bomber '''{{PAGENAME}}'''
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| usage = the premium version
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| link = B7A2 (Homare 23)
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}}
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{{Specs-Card
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|code=b7a2
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|images={{Specs-Card-Image|GarageImage_{{PAGENAME}}.jpg|ArtImage_{{PAGENAME}}.png}}
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}}
  
 
== Description ==
 
== Description ==
 
<!-- ''In the description, the first part should be about the history of and the creation and combat usage of the aircraft, as well as its key features. In the second part, tell the reader about the aircraft in the game. Insert a screenshot of the vehicle, so that if the novice player does not remember the vehicle by name, he will immediately understand what kind of vehicle the article is talking about.'' -->
 
<!-- ''In the description, the first part should be about the history of and the creation and combat usage of the aircraft, as well as its key features. In the second part, tell the reader about the aircraft in the game. Insert a screenshot of the vehicle, so that if the novice player does not remember the vehicle by name, he will immediately understand what kind of vehicle the article is talking about.'' -->
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[[File:GarageImage_{{PAGENAME}}.jpg|420px|thumb|left]]
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The '''{{Specs|name}}''' was a carrier-borne torpedo-dive bomber developed by Aichi for the Imperial Japanese Navy Air Service during the Second World War. It was designed to replace the [[B6N (Family)|B6N Tenzan]] and the [[D4Y (Family)|D4Y Suisei]] in the Navy's service. It had a mid-wing configuration with an inverted gull wing, a four-bladed propeller, and a bomb bay. It was powered by the Nakajima NK9C Homare 12 radial engine, which was expected to become the Navy's standard engine in its power range. The plane was intended to operate from the new Taihō-class carriers, which had larger deck elevators than the older carriers. The plane first flew in May 1942, but production was delayed by various problems with the engine and the airframe. Only 114 planes were built before the war ended. The plane saw limited action in the final stages of the war, mainly from land bases, and did not have much opportunity to demonstrate its potential.
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{{Break}}
 
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The '''{{Specs|name}}''' is a rank {{Specs|rank}} Japanese bomber {{Battle-rating}}. It was introduced in [[Update 1.37]].
 
  
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The Allied reporting name for this aircraft was "Grace".
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The Ryusei was introduced in [[Update 1.37]]. While it looks like a rather large simple torpedo bomber, it is deceivingly manoeuvrable and fast for its vehicle class; this, however, is exchanged for a lack of armour. On top of that, it can bite back with its defensive 13 mm machine gun or engage frontally with two wing-mounted Type 99 Model 2 cannons. While technically classified as a carrier-borne torpedo bomber, it is very capable of fulfilling the roles of dive-, level-, and torpedo bombing targets. While the max tonnage of bombs doesn't increase over the previous [[B6N (Family)|B6N Tenzan]], it can carry four additional wing-mounted 60 kg bombs next to its bomb bay that can load two 250 kg or six 60 kg bombs. The main playstyle of the B7A2 is more like an unarmoured attacker, using its arsenal of bombs and cannons on targets either in the sky, on the ground, or on the sea with the deadly precision of its gyrostabilized dive-bomber sight.
  
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The B7A2 was designed as a carrier-based dive/torpedo bomber. For an aircraft of its size, it has exceptionally good manoeuvrability, on par with the A6M Zero. Therefore it can be used in the fighter role as well, since its two 20 mm cannons perform very well against all other aircraft. When using the B7A2 in either dive or torpedo bombing, it is important to not rely on the B7A2's defensive gunner if an enemy is approaching. The B7A2 can quickly outmanoeuvre most American and Russian aircraft so use this to your advantage if you're being intercepted. You will then be able to quickly tail your enemy, and be able to engage them with your forward firing cannons. As the aircraft is seen, it is a very big target, with minimal armour. This is why it is important to not rely on your defensive gunner. In addition, the B7A2 does not have a very good climb rate, and works best at lower altitudes. Getting your guns on target can also be a pain, especially when traveling at higher speeds since the B7A2's roll rate is very poor. Most enemies are able to easily out roll the B7A2, giving them a distinct advantage in a dogfight. Nonetheless, many pilots do not expect death to come from a dive bomber.
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;Nicknames
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* [[Abbreviations#.28IJN.29_Official_name_designation|Official Designation]]: ''流星 (Ryūsei, "Shooting Star")''
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The B7A2 wields two 20 mm Type 99 mk 2 cannons placed in the wings. Since the B7A2 can be used as a multi-purpose aircraft, the B7A2's weapons will also serve those roles. Equipping the ground targets belt for the 20 mm cannons can be helpful if attacking targets like light pillboxes or light tanks. The Ryusei is also capable of equipping the "Stealth" belt which is composed entirely of HEF and API shells. This belt is the best choice for air to air combat. The B7A2 pilot should remember to set his or her gun convergence lower than 400 meters to take down enemy fighters effectively. Since the cannons themselves are a fair ways apart from each other on the actual aircraft, having a low gun convergence ensures each round hits a single point on a target.
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* Allied reporting name: ''Grace''.
  
 
== General info ==
 
== General info ==
 
=== Flight performance ===
 
=== Flight performance ===
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''Describe how the aircraft behaves in the air. Speed, manoeuvrability, acceleration and allowable loads - these are the most important characteristics of the vehicle.''
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{{Specs-Avia-Flight}}
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<!-- ''Describe how the aircraft behaves in the air. Speed, manoeuvrability, acceleration and allowable loads - these are the most important characteristics of the vehicle.'' -->
 +
 
 +
The B7A2 "Ryusei" represents a significant advancement in the Japanese Navy's multi-role bomber design, surpassing not only its predecessor, the [[B6N (Family)|B6N "Tenzan"]], but also assuming the dive-bomber duties previously assigned to the [[D4Y (Family)|D4Y "Suisei"]]. Featuring a distinctive gull-wing design, internal bomb bay, and offensive armament, the Ryusei marks a notable departure from its predecessors, notably by eliminating the need for a third crew member, with navigational duties now assumed by the rear gunner.
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While these innovations by Aichi resulted in a somewhat heavier and bulkier aircraft, the engine configuration remains largely unchanged, with the Nakajima Homare 12 delivering 1,831 hp at takeoff. This stands in contrast to the lighter Tenzan, powered by the Mitsubishi Kasei 25 engine with 1,826 hp takeoff power. Consequently, the Ryusei exhibits a slower acceleration and somewhat sluggish performance at low speeds. Moreover, the efficient cooling system ensures that overheating is not a concern even under sustained WEP usage which can be used without limit.
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One significant flaw in the manoeuvrability of the Ryusei is its roll rate. While its turn rate, rudder, and elevator authorities are relatively fine, the roll rate is notably stiff. Pilots need to be aware of this characteristic. Simply rolling out of combat is not a straightforward manoeuvre, and to leverage its commendable turn rate, the initiation of the roll should be done as early as possible.
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The B7A2's manoeuvrability and acceleration are notably weak when operating below 300 km/h. However, as its speed increases between 300 and 500 km/h, the Ryusei demonstrates impressive agility, often outperforming enemy fighters in turns. With the added boost of WEP, it maintains energy well during manoeuvres, allowing it to effectively pursue adversaries.
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Nevertheless, as the Ryusei's velocity surpasses 500 km/h, it begins to experience a gradual loss of control, eventually leading to lockup around 600 km/h. This limitation poses risks, particularly during dive-bombing missions, where failed pull-ups can be fatal. Fortunately, the aircraft's airbrakes offer a solution by restoring control and facilitating safe recovery from dives.
  
 
{| class="wikitable" style="text-align:center" width="70%"
 
{| class="wikitable" style="text-align:center" width="70%"
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! Combat !! Take-off !! Landing !! + !! -
 
! Combat !! Take-off !! Landing !! + !! -
 
|-
 
|-
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| {{Specs|destruction|body}} || {{Specs|destruction|gear}} || 480 || 480 || 280 || ~13 || ~13
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| 680 <!-- {{Specs|destruction|body}} --> || {{Specs|destruction|gear}} || 457 || 428 || 280 || ~15 || ~15
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|-
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|}
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{| class="wikitable" style="text-align:center"
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|-
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! colspan="4" | Optimal velocities (km/h)
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|-
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! Ailerons !! Rudder !! Elevators !! Radiator
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|-
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| < 380 || < 380 || < 450 || > 312
 
|-
 
|-
 
|}
 
|}
  
 
=== Survivability and armour ===
 
=== Survivability and armour ===
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{{Specs-Avia-Armour}}
 
<!-- ''Examine the survivability of the aircraft. Note how vulnerable the structure is and how secure the pilot is, whether the fuel tanks are armoured, etc. Describe the armour, if there is any, and also mention the vulnerability of other critical aircraft systems.'' -->
 
<!-- ''Examine the survivability of the aircraft. Note how vulnerable the structure is and how secure the pilot is, whether the fuel tanks are armoured, etc. Describe the armour, if there is any, and also mention the vulnerability of other critical aircraft systems.'' -->
  
 
* 13 mm steel plate in the nose
 
* 13 mm steel plate in the nose
 
* Fuel tanks are not self-sealing (3 in each wing)
 
* Fuel tanks are not self-sealing (3 in each wing)
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 +
Although the B7A2's airframe is fairly durable, the pilot and gunner is exposed to an attack from any angle except frontally due the lack of bulletproof glass and armour. As the Ryusei lacks any self-sealing fuel tank, fire damage will be a death sentence for the plane.
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 +
=== Modifications and economy ===
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{{Specs-Economy}}
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Since the B7A2 is a multi-role aircraft any module research path is viable. Unlocking performance modules will boost survivability and damage potential in dogfights, whereas unlocking armament modules will help with the ground attack. Some of the best modules to unlock are the "Engine injection" and "Offensive 20 mm belts".
  
 
== Armaments ==
 
== Armaments ==
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{{Specs-Avia-Armaments}}
 
=== Offensive armament ===
 
=== Offensive armament ===
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{{Specs-Avia-Offensive}}
 
<!-- ''Describe the offensive armament of the aircraft, if any. Describe how effective the cannons and machine guns are in a battle, and also what belts or drums are better to use. If there is no offensive weaponry, delete this subsection.'' -->
 
<!-- ''Describe the offensive armament of the aircraft, if any. Describe how effective the cannons and machine guns are in a battle, and also what belts or drums are better to use. If there is no offensive weaponry, delete this subsection.'' -->
 
{{main|Type 99 Model 2 (20 mm)}}
 
{{main|Type 99 Model 2 (20 mm)}}
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=== Suspended armament ===
 
=== Suspended armament ===
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{{Specs-Avia-Suspended}}
 
<!-- ''Describe the aircraft's suspended armament: additional cannons under the wings, bombs, rockets and torpedoes. This section is especially important for bombers and attackers. If there is no suspended weaponry remove this subsection.'' -->
 
<!-- ''Describe the aircraft's suspended armament: additional cannons under the wings, bombs, rockets and torpedoes. This section is especially important for bombers and attackers. If there is no suspended weaponry remove this subsection.'' -->
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{{main|Navy Type 97 Number 6 (60 kg)|Navy Type 98 Number 25 (250 kg)|Navy Type Number 80 Model 1 (800 kg)|Type 91 Model 3 (850 kg)}}
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{{main|Navy Type 97 Number 6 (60 kg)|Navy Type 98 Number 25 (250 kg)|Number 80 Mod. 1 (800 kg)|Type 91 Model 3 (850 kg)}}
  
 
The '''''{{PAGENAME}}''''' can be outfitted with the following ordnance:
 
The '''''{{PAGENAME}}''''' can be outfitted with the following ordnance:
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* 10 x 60 kg Navy Type 97 Number 6 bombs (600 kg total)
 
* 10 x 60 kg Navy Type 97 Number 6 bombs (600 kg total)
 
* 2 x 250 kg Navy Type 98 Number 25 bombs + 4 x 60 kg Navy Type 97 Number 6 bombs (740 kg total)
 
* 2 x 250 kg Navy Type 98 Number 25 bombs + 4 x 60 kg Navy Type 97 Number 6 bombs (740 kg total)
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* 1 x 800 kg Navy Type Number 80 Model 1 bomb (800 kg total)
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* 1 x 800 kg Number 80 Mod. 1 bomb (800 kg total)
 
* 1 x 850 kg Type 91 Model 3 torpedo
 
* 1 x 850 kg Type 91 Model 3 torpedo
  
 
=== Defensive armament ===
 
=== Defensive armament ===
 +
{{Specs-Avia-Defensive}}
 
<!-- ''Defensive armament with turret machine guns or cannons, crewed by gunners. Examine the number of gunners and what belts or drums are better to use. If defensive weaponry is not available, remove this subsection.'' -->
 
<!-- ''Defensive armament with turret machine guns or cannons, crewed by gunners. Examine the number of gunners and what belts or drums are better to use. If defensive weaponry is not available, remove this subsection.'' -->
 
{{main|Type 2 (13 mm)}}
 
{{main|Type 2 (13 mm)}}
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|-
 
|-
 
|}
 
|}
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=== Modules ===
 
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{| class="wikitable"
 
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! Tier
 
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! colspan="2" | Flight performance
 
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! Survivability
 
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! colspan="2" | Weaponry
 
−
|-
 
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| I
 
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| Fuselage repair
 
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| Radiator
 
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|
 
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| Turret 13 mm
 
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| 17 3/4 in (mod45)
 
−
|-
 
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| II
 
−
|
 
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| Compressor
 
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| Airframe
 
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| New 13 mm MGs (turret)
 
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| 12 in (mod30)
 
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|-
 
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| III
 
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| Wings repair
 
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| Engine
 
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|
 
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| Offensive 20 mm
 
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| 14 in (mod35)
 
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|-
 
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| IV
 
−
|
 
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| Engine injection
 
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| Cover
 
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| New 20 mm cannons
 
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|
 
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|-
 
−
|}
 
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Since the B7A2 is a multi-role aircraft any module research path is viable. Unlocking performance modules will boost survivability and damage potential in dogfights, whereas unlocking armament modules will help with the ground attack. Some of the best modules to unlock are the "Engine injection" and "Offensive 20 mm belts".
 
  
 
=== Pros and cons ===
 
=== Pros and cons ===
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'''Pros:'''
 
'''Pros:'''
  
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* Handling and performance on par with the A6M Reisen
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* Bomber spawn
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* Really good vertical turn rate (catches many oponents off guard)
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* Excellent manoeuvrability - it can outturn many of the single-engine fighters
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* Forward-firing 2 x 20 mm cannons
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* Airbrakes
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* Defensive 13.2 mm gunner for protection
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* Short take-off and landing distance
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* Performs well at low altitudes
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* [[Type 91 Model 3 (850 kg)|Type 91 Aerial Torpedo]] has extremely large warhead and the highest drop speed in the game at {{Annotation|580 km/h|350 mph}} and is one of the most feared torpedoes in Naval Battles
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* Can equip a heavy payload
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* [[Number 80 Mod. 1 (800 kg)|Heaviest bomb]] Japanese Navy can offer
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* Can use bomber spawn and hunt bombers
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* Two excellent [[Type 99 Model 2 (20 mm)|20 mm guns]] make it able to engage fighters and bombers alike
−
* 800 kg bomb excellent for taking out destroyers or even light cruisers
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* 13 mm steel plate behind the engine protects traction of control surfaces and crew from machine guns
 +
* Excellent cockpit visibility in all directions
  
 
'''Cons:'''
 
'''Cons:'''
  
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* Large aircraft, easy target
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* Relatively large target with no self-sealing fuel tanks or bulletproof glass
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* Suffers damage very easily
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* Easily compress when exceeding 600 km/h
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* Slow acceleration
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* Worse climb rate than many of the analogous single-engine bombers
−
* Lots of bars in the cockpit canopy, hinders visibility
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* Limited WEP time (only 5 minutes 20 seconds of water injection)
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* Cannot perform high-speed manoeuvres
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* No access to Armour-Piercing bombs or rockets
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* Very slow roll rate
 
−
* Poor rate of climb
 
−
* Gunner is prone to be knocked out
 
  
 
== History ==
 
== History ==
 
<!-- ''Describe the history of the creation and combat usage of the aircraft in more detail than in the introduction. If the historical reference turns out to be too long, take it to a separate article, taking a link to the article about the vehicle and adding a block "/History" (example: <nowiki>https://wiki.warthunder.com/(Vehicle-name)/History</nowiki>) and add a link to it here using the <code>main</code> template. Be sure to reference text and sources by using <code><nowiki><ref></ref></nowiki></code>, as well as adding them at the end of the article with <code><nowiki><references /></nowiki></code>. This section may also include the vehicle's dev blog entry (if applicable) and the in-game encyclopedia description (under <code><nowiki>=== In-game description ===</nowiki></code>, also if applicable).'' -->
 
<!-- ''Describe the history of the creation and combat usage of the aircraft in more detail than in the introduction. If the historical reference turns out to be too long, take it to a separate article, taking a link to the article about the vehicle and adding a block "/History" (example: <nowiki>https://wiki.warthunder.com/(Vehicle-name)/History</nowiki>) and add a link to it here using the <code>main</code> template. Be sure to reference text and sources by using <code><nowiki><ref></ref></nowiki></code>, as well as adding them at the end of the article with <code><nowiki><references /></nowiki></code>. This section may also include the vehicle's dev blog entry (if applicable) and the in-game encyclopedia description (under <code><nowiki>=== In-game description ===</nowiki></code>, also if applicable).'' -->
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Two-seat carrier-based Aichi B7A2 Ryusei "Shooting Star" or "Meteor" Torpedo/Dive Bomber (Allied reporting name: Grace). The B7A was an answer to a specification for a carrier-based torpedo/dive bomber in 1941. It was intended to replace B6N and D4Y, having an internal and external payload, increased speed and long-range. Some of the design features of the B7A include; inverted gull-wings, conventional fuselage, and tail unit and a four-bladed propeller. During its development, it went through a series of shortcomings, such as the delivery of engines, and an accidental earthquake which destroyed the main factory housing most of the B7A's. Thus not seeing active service until 1944. By this time, there were no aircraft carriers capable of operating the B7A. The last aircraft carrier being the Shinano was sunk 10 days after its commission. The B7A2 was then forced to operate in home-defence operations, seeing limited service.
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Two-seat carrier-based Aichi B7A2 Ryusei "Shooting Star" or "Meteor" Torpedo/Dive Bomber (Allied reporting name: Grace). The B7A was an answer to a specification for a carrier-based torpedo/dive bomber in 1941. It was intended to replace B6N and D4Y, having an internal and external payload, increased speed and long-range. Some of the design features of the B7A include; inverted gull-wings, conventional fuselage, and tail unit and a four-bladed propeller. During its development, it went through a series of shortcomings, such as the delivery of engines, and an accidental earthquake which destroyed the main factory housing most of the B7As. Thus not seeing active service until 1944. By this time, there were no aircraft carriers capable of operating the B7A. The last aircraft carrier being the Shinano was sunk 10 days after its commission. The B7A2 was then forced to operate in home defence operations, seeing limited service.
  
 
Known as the AM-23 within Aichi, the first prototype was completed and flown in May 1942 which was designated the B7A1 by the Navy. The B7A used the Nakajima NK9C 12 Model radial engine, producing 1,825 hp. This gave the aircraft exceptionally good speed, even when fully loaded with ammunition and bombs. During flight testing, the Navy was very impressed with its performance. Despite it being a very large light bomber, the B7A1 displayed handling and performance comparable to the Mitsubishi's A6M Zero and a further 8 prototypes were ordered. However, with more testing underway, it was noted that the engine (which was experimental as well) suffered teething problems, and the airframe of the aircraft needed modifying structurally. It was not until two years later that the B7A would begin production in 1944.
 
Known as the AM-23 within Aichi, the first prototype was completed and flown in May 1942 which was designated the B7A1 by the Navy. The B7A used the Nakajima NK9C 12 Model radial engine, producing 1,825 hp. This gave the aircraft exceptionally good speed, even when fully loaded with ammunition and bombs. During flight testing, the Navy was very impressed with its performance. Despite it being a very large light bomber, the B7A1 displayed handling and performance comparable to the Mitsubishi's A6M Zero and a further 8 prototypes were ordered. However, with more testing underway, it was noted that the engine (which was experimental as well) suffered teething problems, and the airframe of the aircraft needed modifying structurally. It was not until two years later that the B7A would begin production in 1944.
  
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Up until May 1945, 80 B7A2's had been completed. But soon after, a severe earthquake occurred, destroying the factory housing the aircraft that were being assembled. A further 25 more examples were completed by another factory. Throughout the B7A2's service, different variants were planned. Firstly, was an experimental production B7A2, that was fitted with the Nakajima Homare 23 radial engine, producing 2,000 hp. Only 1 was built. Secondly, came the B7A3 Ryusei-Kai. This was to use the Mitsubishi Ha-43 radial engine producing 2,200 hp but it was not built. Lastly, came the B8A1 Mokusei "Planet". This was to have no carrier equipment and no gull wings. In addition, 2 x Type 99 20mm cannons were to be replaced with 2 x Type 5 30mm cannons. The B8A remained on the drawing board before the war ended, with no mock-up even though it was accepted to be built.
+
Up until May 1945, 80 B7A2s had been completed. But soon after, a severe earthquake occurred, destroying the factory housing the aircraft that were being assembled. A further 25 more examples were completed by another factory. Throughout the B7A2's service, different variants were planned. Firstly, was an experimental production B7A2, that was fitted with the Nakajima Homare 23 radial engine, producing 2,000 hp. Only 1 was built. Secondly, came the B7A3 Ryusei-Kai. This was to use the Mitsubishi Ha-43 radial engine producing 2,200 hp but it was not built. Lastly, came the B8A1 Mokusei "Planet". This was to have no carrier equipment and no gull wings. In addition, 2 x 20 mm Type 99 cannons were to be replaced with 2 x 30 mm Type 5 cannons. The B8A remained on the drawing board before the war ended, with no mock-up even though it was accepted to be built.
  
−
In all, 9 B7A1's, and 105 B7A2's were produced. 114 in total.
+
In all, 9 B7A1s, and 105 B7A2s were produced. 114 in total.
  
 
Katori Naval Air Base, Chiba-Prefecture, Japan, May 1945
 
Katori Naval Air Base, Chiba-Prefecture, Japan, May 1945
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<br> - ''752nd Naval Air Group''
+
<br> - 752nd Naval Air Group
  
 
Kanogawa-Prefecture, Japan, April 1945
 
Kanogawa-Prefecture, Japan, April 1945
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<br> - ''Yokosuka Naval Air Group''
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<br> - Yokosuka Naval Air Group
  
 
== Media ==
 
== Media ==
 
<!-- ''Excellent additions to the article would be video guides, screenshots from the game, and photos.'' -->
 
<!-- ''Excellent additions to the article would be video guides, screenshots from the game, and photos.'' -->
  
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* [http://live.warthunder.com/feed/camouflages/?q=%23b7a2 '''Skins''' and camouflages for the B7A2 Ryusei from http://live.warthunder.com]
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;Skins
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 +
* [https://live.warthunder.com/feed/camouflages/?vehicle=b7a2 Skins and camouflages for the {{PAGENAME}} from live.warthunder.com.]
  
 
== See also ==
 
== See also ==
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<!-- ''Paste links to sources and external resources, such as:''
 
<!-- ''Paste links to sources and external resources, such as:''
 
* ''topic on the official game forum;''
 
* ''topic on the official game forum;''
−
* ''encyclopedia page on the aircraft;''
 
 
* ''other literature.'' -->
 
* ''other literature.'' -->
  
−
* [http://www.aviastar.org/air/japan/aichi_b7a.php [aviastar.org<nowiki>]</nowiki> Aichi B7A Ryusei / Grace]
+
* [https://forum.warthunder.com/index.php?/topic/87947-aichi-b7a2/ Official data sheet - more details about the performance]
−
* [http://www.militaryfactory.com/aircraft/detail.asp?aircraft_id=442 [MilitaryFactory.com<nowiki>]</nowiki> Aichi B7A Ryusei (Grace)]
+
* [http://www.aviastar.org/air/japan/aichi_b7a.php <nowiki>[aviastar.org]</nowiki> Aichi B7A Ryusei / Grace]
−
* [https://airandspace.si.edu/collection-objects/aichi-b7a2-ryusei-shooting-star-grace/nasm_A19630360000 [Smithsonian NASM<nowiki>]</nowiki> Aichi B7A2 Ryusei (Shooting Star) GRACE]
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* [http://www.militaryfactory.com/aircraft/detail.asp?aircraft_id=442 <nowiki>[MilitaryFactory.com]</nowiki> Aichi B7A Ryusei (Grace)]
−
* [http://www.hyperscale.com/features/2000/graceir_1.htm [HyperScale.com<nowiki>]</nowiki> Aichi B7A2 Ryusei Kai "Grace"]
+
* [https://airandspace.si.edu/collection-objects/aichi-b7a2-ryusei-shooting-star-grace/nasm_A19630360000 <nowiki>[Smithsonian NASM]</nowiki> Aichi B7A2 Ryusei (Shooting Star) GRACE]
−
* [http://www.hyperscale.com/2013/reviews/kits/sword72069reviewmd_1.htm [HyperScale.com<nowiki>]</nowiki> Aichi B7A2 Ryusei Kai (Grace)]
+
* [http://www.hyperscale.com/features/2000/graceir_1.htm <nowiki>[HyperScale.com]</nowiki> Aichi B7A2 Ryusei Kai "Grace"]
 +
* [http://www.hyperscale.com/2013/reviews/kits/sword72069reviewmd_1.htm <nowiki>[HyperScale.com]</nowiki> Aichi B7A2 Ryusei Kai (Grace)]
  
 
{{AirManufacturer Aichi}}
 
{{AirManufacturer Aichi}}
 
{{Japan bombers}}
 
{{Japan bombers}}

Latest revision as of 19:35, 6 November 2024

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This page is about the Japanese bomber B7A2. For the premium version, see B7A2 (Homare 23).
B7A2
b7a2.png
GarageImage B7A2.jpg
ArtImage B7A2.png
B7A2
Japan flag.png Japan
III Rank
Battle rating:
AB RB SB
3.7 3.7 4.0
Class:
Research:26 000 Specs-Card-Exp.png
Purchase:76 000 Specs-Card-Lion.png
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Description

The B7A2 Ryusei was a carrier-borne torpedo-dive bomber developed by Aichi for the Imperial Japanese Navy Air Service during the Second World War. It was designed to replace the B6N Tenzan and the D4Y Suisei in the Navy's service. It had a mid-wing configuration with an inverted gull wing, a four-bladed propeller, and a bomb bay. It was powered by the Nakajima NK9C Homare 12 radial engine, which was expected to become the Navy's standard engine in its power range. The plane was intended to operate from the new Taihō-class carriers, which had larger deck elevators than the older carriers. The plane first flew in May 1942, but production was delayed by various problems with the engine and the airframe. Only 114 planes were built before the war ended. The plane saw limited action in the final stages of the war, mainly from land bases, and did not have much opportunity to demonstrate its potential.

The Ryusei was introduced in Update 1.37. While it looks like a rather large simple torpedo bomber, it is deceivingly manoeuvrable and fast for its vehicle class; this, however, is exchanged for a lack of armour. On top of that, it can bite back with its defensive 13 mm machine gun or engage frontally with two wing-mounted Type 99 Model 2 cannons. While technically classified as a carrier-borne torpedo bomber, it is very capable of fulfilling the roles of dive-, level-, and torpedo bombing targets. While the max tonnage of bombs doesn't increase over the previous B6N Tenzan, it can carry four additional wing-mounted 60 kg bombs next to its bomb bay that can load two 250 kg or six 60 kg bombs. The main playstyle of the B7A2 is more like an unarmoured attacker, using its arsenal of bombs and cannons on targets either in the sky, on the ground, or on the sea with the deadly precision of its gyrostabilized dive-bomber sight.

Nicknames

General info

Flight performance

Arrestor gear
Accelerates braking by grabbing the brake cable on the deck of the aircraft carrier
Air brakes
Allows you to dramatically reduce the flight speed by releasing special flaps
Max speed
at 6 550 m565 km/h
Turn time28 s
Max altitude8 260 m
EngineNakajima Homare 12
TypeRadial
Cooling systemAir
Take-off weight7 t

The B7A2 "Ryusei" represents a significant advancement in the Japanese Navy's multi-role bomber design, surpassing not only its predecessor, the B6N "Tenzan", but also assuming the dive-bomber duties previously assigned to the D4Y "Suisei". Featuring a distinctive gull-wing design, internal bomb bay, and offensive armament, the Ryusei marks a notable departure from its predecessors, notably by eliminating the need for a third crew member, with navigational duties now assumed by the rear gunner.

While these innovations by Aichi resulted in a somewhat heavier and bulkier aircraft, the engine configuration remains largely unchanged, with the Nakajima Homare 12 delivering 1,831 hp at takeoff. This stands in contrast to the lighter Tenzan, powered by the Mitsubishi Kasei 25 engine with 1,826 hp takeoff power. Consequently, the Ryusei exhibits a slower acceleration and somewhat sluggish performance at low speeds. Moreover, the efficient cooling system ensures that overheating is not a concern even under sustained WEP usage which can be used without limit.

One significant flaw in the manoeuvrability of the Ryusei is its roll rate. While its turn rate, rudder, and elevator authorities are relatively fine, the roll rate is notably stiff. Pilots need to be aware of this characteristic. Simply rolling out of combat is not a straightforward manoeuvre, and to leverage its commendable turn rate, the initiation of the roll should be done as early as possible.

The B7A2's manoeuvrability and acceleration are notably weak when operating below 300 km/h. However, as its speed increases between 300 and 500 km/h, the Ryusei demonstrates impressive agility, often outperforming enemy fighters in turns. With the added boost of WEP, it maintains energy well during manoeuvres, allowing it to effectively pursue adversaries.

Nevertheless, as the Ryusei's velocity surpasses 500 km/h, it begins to experience a gradual loss of control, eventually leading to lockup around 600 km/h. This limitation poses risks, particularly during dive-bombing missions, where failed pull-ups can be fatal. Fortunately, the aircraft's airbrakes offer a solution by restoring control and facilitating safe recovery from dives.

Characteristics Max Speed
(km/h at 6,550 m) 		Max altitude
(metres) 		Turn time
(seconds) 		Rate of climb
(metres/second) 		Take-off run
(metres)
AB RB AB RB AB RB
Stock 542 525 8260 28.8 29.6 7.3 7.3 270
Upgraded 594 565 26.7 28.0 17.7 10.4

Details

Features
Combat flaps Take-off flaps Landing flaps Air brakes Arrestor gear
✓ ✓ ✓ ✓ ✓
Limits
Wings (km/h) Gear (km/h) Flaps (km/h) Max Static G
Combat Take-off Landing + -
680 350 457 428 280 ~15 ~15
Optimal velocities (km/h)
Ailerons Rudder Elevators Radiator
< 380 < 380 < 450 > 312

Survivability and armour

Crew2 people
Speed of destruction
Structural0 km/h
Gear350 km/h
  • 13 mm steel plate in the nose
  • Fuel tanks are not self-sealing (3 in each wing)

Although the B7A2's airframe is fairly durable, the pilot and gunner is exposed to an attack from any angle except frontally due the lack of bulletproof glass and armour. As the Ryusei lacks any self-sealing fuel tank, fire damage will be a death sentence for the plane.

Modifications and economy

Repair costBasic → Reference
AB1 202 → 1 530 Sl icon.png
RB2 237 → 2 847 Sl icon.png
SB4 455 → 5 671 Sl icon.png
Total cost of modifications24 500 Rp icon.png
44 300 Sl icon.png
Talisman cost1 100 Ge icon.png
Crew training22 000 Sl icon.png
Experts76 000 Sl icon.png
Aces500 Ge icon.png
Research Aces320 000 Rp icon.png
Reward for battleAB / RB / SB
80 / 170 / 290 % Sl icon.png
142 / 142 / 142 % Rp icon.png
Modifications
Flight performance Survivability Weaponry
Mods aerodinamic fuse.png
Fuselage repair
Research:
1 200 Rp icon.png
Cost:
2 200 Sl icon.png
120 Ge icon.png
Mods radiator.png
Radiator
Research:
1 200 Rp icon.png
Cost:
2 200 Sl icon.png
120 Ge icon.png
Mods compressor.png
Compressor
Research:
1 400 Rp icon.png
Cost:
2 500 Sl icon.png
140 Ge icon.png
Mods aerodinamic wing.png
Wings repair
Research:
1 500 Rp icon.png
Cost:
2 700 Sl icon.png
150 Ge icon.png
Mods new engine.png
Engine
Research:
1 500 Rp icon.png
Cost:
2 700 Sl icon.png
150 Ge icon.png
Mods metanol.png
Engine injection
Research:
2 700 Rp icon.png
Cost:
4 900 Sl icon.png
270 Ge icon.png
Mods armor frame.png
Airframe
Research:
1 400 Rp icon.png
Cost:
2 500 Sl icon.png
140 Ge icon.png
Mods armor cover.png
Cover
Research:
2 700 Rp icon.png
Cost:
4 900 Sl icon.png
270 Ge icon.png
Mods ammo.png
type2_turret_belt_pack
Research:
1 200 Rp icon.png
Cost:
2 200 Sl icon.png
120 Ge icon.png
Mod arrow 0.png
Mods pilon torpedo.png
17 3/4 in (mod45)
Research:
1 200 Rp icon.png
Cost:
2 200 Sl icon.png
120 Ge icon.png
Mod arrow 0.png
Mods turret gun.png
type2_turret_new_gun
Research:
1 400 Rp icon.png
Cost:
2 500 Sl icon.png
140 Ge icon.png
Mods pilon bomb.png
12 in (mod30)
Research:
1 400 Rp icon.png
Cost:
2 500 Sl icon.png
140 Ge icon.png
Mod arrow 0.png
Mods ammo.png
type99mk2_belt_pack
Research:
1 500 Rp icon.png
Cost:
2 700 Sl icon.png
150 Ge icon.png
Mod arrow 0.png
Mods pilon bomb.png
14 in (mod35)
Research:
1 500 Rp icon.png
Cost:
2 700 Sl icon.png
150 Ge icon.png
Mods weapon.png
type99mk2_new_gun
Research:
2 700 Rp icon.png
Cost:
4 900 Sl icon.png
270 Ge icon.png

Since the B7A2 is a multi-role aircraft any module research path is viable. Unlocking performance modules will boost survivability and damage potential in dogfights, whereas unlocking armament modules will help with the ground attack. Some of the best modules to unlock are the "Engine injection" and "Offensive 20 mm belts".

Armaments

Offensive armament

Weapon 12 x 20 mm Type 99 Model 2 cannon
Ammunition400 rounds
Fire rate490 shots/min
Main article: Type 99 Model 2 (20 mm)

The B7A2 is armed with:

  • 2 x 20 mm Type 99 Model 2 cannons, wing-mounted (200 rpg = 400 total)

Suspended armament

List of setups (4)
Setup 110 x 60 kg Navy Type 97 Number 6 ground bomb
Setup 24 x 60 kg Navy Type 97 Number 6 ground bomb
2 x 250 kg Navy Type 98 Number 25 bomb
Setup 31 x 800 kg Number 80 Mod. 1 bomb
Setup 41 x Type 91 Model 3 torpedo (850 kg)
Main articles: Navy Type 97 Number 6 (60 kg), Navy Type 98 Number 25 (250 kg), Number 80 Mod. 1 (800 kg), Type 91 Model 3 (850 kg)

The B7A2 can be outfitted with the following ordnance:

  • 10 x 60 kg Navy Type 97 Number 6 bombs (600 kg total)
  • 2 x 250 kg Navy Type 98 Number 25 bombs + 4 x 60 kg Navy Type 97 Number 6 bombs (740 kg total)
  • 1 x 800 kg Number 80 Mod. 1 bomb (800 kg total)
  • 1 x 850 kg Type 91 Model 3 torpedo

Defensive armament

Turret13 mm Type 2 machine gun
Ammunition1000 rounds
Fire rate937 shots/min
Main article: Type 2 (13 mm)

The B7A2 is defended by:

  • 1 x 13 mm Type 2 machine gun, dorsal turret (1,000 rpg)

Usage in battles

The Ryusei is best utilized as a multi-role aircraft, similar to the role the Ju 87 D-5 plays. Once its payload is dropped, the B7A2 becomes a low altitude, low-speed dogfighter similar to an A6M. In realistic battles, the B7A2 is often paired with aircraft such as the A6M3, A6M3 mod. 22, and A6M3 mod. 22Ko. If unable to shake an enemy off your tail, these "Zeroes" can be relied on as they have impressive low altitude capabilities.

Payload choice is dependent on target choice. If the target is a light pillbox, for instance, one does not need an 800 kg bomb. Instead, equip either of the other bomb loadout options. The same goes for most ground units, apart from arcade mini bases. The Ryusei is similar to aircraft such as the Ki-49-IIa in that it can "hover" above an enemy base or airfield, rapidly dropping its payload and diving up to altitude again. Since the B7A2 is a dive bomber, it does not have to be level to drop its payload accurately. The Ryusei's ability to "hover" above enemy mini bases and airfields can be a great help to any arcade battles team. Upgrading the crew reload speed makes this aircraft a potential game-winner, especially when in a squad.

Similar to the Ju 87 D-5, the Ryusei's airspeed is not on par with the aircraft it faces, no matter the game mode. This handicaps the B7A2 to playing solely a support role, only being able to engage the aircraft it can catch. Nonetheless, having a B7A2 on any team, no matter the game mode, never hurts.

Manual Engine Control

MEC elements
Mixer Pitch Radiator Supercharger Turbocharger
Oil Water Type
Controllable Controllable
Not auto controlled 		Controllable
Auto control available 		Controllable
Auto control available 		Separate Controllable
2 gears 		Not controllable

Pros and cons

Pros:

  • Bomber spawn
  • Excellent manoeuvrability - it can outturn many of the single-engine fighters
  • Airbrakes
  • Short take-off and landing distance
  • Type 91 Aerial Torpedo has extremely large warhead and the highest drop speed in the game at 580 km/h and is one of the most feared torpedoes in Naval Battles
  • Heaviest bomb Japanese Navy can offer
  • Two excellent 20 mm guns make it able to engage fighters and bombers alike
  • 13 mm steel plate behind the engine protects traction of control surfaces and crew from machine guns
  • Excellent cockpit visibility in all directions

Cons:

  • Relatively large target with no self-sealing fuel tanks or bulletproof glass
  • Easily compress when exceeding 600 km/h
  • Worse climb rate than many of the analogous single-engine bombers
  • Limited WEP time (only 5 minutes 20 seconds of water injection)
  • No access to Armour-Piercing bombs or rockets

History

Two-seat carrier-based Aichi B7A2 Ryusei "Shooting Star" or "Meteor" Torpedo/Dive Bomber (Allied reporting name: Grace). The B7A was an answer to a specification for a carrier-based torpedo/dive bomber in 1941. It was intended to replace B6N and D4Y, having an internal and external payload, increased speed and long-range. Some of the design features of the B7A include; inverted gull-wings, conventional fuselage, and tail unit and a four-bladed propeller. During its development, it went through a series of shortcomings, such as the delivery of engines, and an accidental earthquake which destroyed the main factory housing most of the B7As. Thus not seeing active service until 1944. By this time, there were no aircraft carriers capable of operating the B7A. The last aircraft carrier being the Shinano was sunk 10 days after its commission. The B7A2 was then forced to operate in home defence operations, seeing limited service.

Known as the AM-23 within Aichi, the first prototype was completed and flown in May 1942 which was designated the B7A1 by the Navy. The B7A used the Nakajima NK9C 12 Model radial engine, producing 1,825 hp. This gave the aircraft exceptionally good speed, even when fully loaded with ammunition and bombs. During flight testing, the Navy was very impressed with its performance. Despite it being a very large light bomber, the B7A1 displayed handling and performance comparable to the Mitsubishi's A6M Zero and a further 8 prototypes were ordered. However, with more testing underway, it was noted that the engine (which was experimental as well) suffered teething problems, and the airframe of the aircraft needed modifying structurally. It was not until two years later that the B7A would begin production in 1944.

Up until May 1945, 80 B7A2s had been completed. But soon after, a severe earthquake occurred, destroying the factory housing the aircraft that were being assembled. A further 25 more examples were completed by another factory. Throughout the B7A2's service, different variants were planned. Firstly, was an experimental production B7A2, that was fitted with the Nakajima Homare 23 radial engine, producing 2,000 hp. Only 1 was built. Secondly, came the B7A3 Ryusei-Kai. This was to use the Mitsubishi Ha-43 radial engine producing 2,200 hp but it was not built. Lastly, came the B8A1 Mokusei "Planet". This was to have no carrier equipment and no gull wings. In addition, 2 x 20 mm Type 99 cannons were to be replaced with 2 x 30 mm Type 5 cannons. The B8A remained on the drawing board before the war ended, with no mock-up even though it was accepted to be built.

In all, 9 B7A1s, and 105 B7A2s were produced. 114 in total.

Katori Naval Air Base, Chiba-Prefecture, Japan, May 1945
- 752nd Naval Air Group

Kanogawa-Prefecture, Japan, April 1945
- Yokosuka Naval Air Group

Media

Skins

See also

Links to the articles on the War Thunder Wiki that you think will be useful for the reader, for example:

  • reference to the series of the aircraft;
  • links to approximate analogues of other nations and research trees.

External links


Aichi Aircraft Company, Limited (愛知航空機株式会社)
Bombers  D3A1
  B7A2 · B7A2 (Homare 23)
Recon  E13A1

Japan bombers
Navy 
Carrier-based attack bomber 
B5N  B5N2
B6N  B6N1 · B6N2 · B6N2a
B7A  B7A2 · B7A2 (Homare 23)
Carrier-based dive bomber 
D3A  D3A1
D4Y  D4Y1 · D4Y2 · D4Y3 Ko
Shipboard Observation seaplane 
F1M  F1M2
Land-based Attack bomber 
G4M  G4M1
G5N  G5N1
G8N  G8N1
Flying boat 
H6K  H6K4
H8K  H8K2 · H8K3
Land-based Bomber 
P1Y  P1Y1
Army 
Light  Ki-32
  Ki-48-II otsu
Heavy  Ki-21-Ia · Ki-21-I hei
  Ki-49-I · Ki-49-IIa · Ki-49-IIb · Ki-49-IIb/L
  Ki-67-I Ko · Ki-67-I otsu
Other countries  ▅B-17E

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