Difference between revisions of "La-7B-20"

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{{Relevance|br}}
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{{About
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{{Specs-Card|code=la-7b-20}}
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| about = Soviet fighter '''{{PAGENAME}}'''
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{{Notice|''This page is about the aircraft '''{{PAGENAME}}'''. For other uses, see [[La-7_(Disambiguation)|La-7 (Disambiguation)]]''}}
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| usage = other versions
 +
| link = La-7 (Family)
 +
}}
 +
{{Specs-Card
 +
|code=la-7b-20
 +
|images={{Specs-Card-Image|GarageImage_{{PAGENAME}}.jpg}}
 +
}}
 +
 
 
== Description ==
 
== Description ==
−
<!--''In the description, the first part needs to 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. If the novice player does not remember the vehicle by name, he will immediately understand what kind of vehicle it 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_La-7B-20.jpg|420px|thumb|left|The '''{{PAGENAME}}''' in the garage]]
+
The La-7 was originally intended to equip a set of three B-20S 20 mm cannons. However, due to reliability problems with said armament, two 20 mm ShVAK cannons were used instead, the same armament as the previous La-5 series of fighters. A total of 368 fighters equipped with B-20S cannons were produced before switching to the regular La-7. The three B-20 cannons were known as "three pointers" and were liked by test pilots.
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{{break}}
+
 
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The '''{{Specs|name}}''' is a Rank {{Specs|rank}} Russian fighter {{Battle-rating|3}}. This aircraft was introduced in Update 1.31.
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It was introduced in [[Update 1.31]]. Compared to the regular La-7, the La-7B-20 has worse flight performance and fewer rounds per gun. However, with 3 guns instead of 2, each salvo fired is deadlier with the B-20 cannons. The aircraft has the same Shvetsov M-82FN as the La-7, the decreased flight performance can be attributed to the increased weight of the 3 x B-20 cannons. Try to use boom and zoom tactics, and stay below 4,000 m for dogfights for maximum engine performance.
  
 
== General info ==
 
== General info ==
−
=== Flight Performance ===
+
=== Flight performance ===
−
<!--''Describe how the aircraft behaves in the air. Maximum speed, maneuverability, speed and allowable loads - these are the most important characteristics of the vehicle.''-->
+
{{Specs-Avia-Flight}}
−
{| class="wikitable" style="text-align:center"
+
<!--''Describe how the aircraft behaves in the air. Speed, manoeuvrability, acceleration and allowable loads - these are the most important characteristics of the vehicle.''-->
−
|-
+
 
−
! colspan="8" | Characteristics
+
{| class="wikitable" style="text-align:center" width="70%"
−
|-
+
! rowspan="2" | Characteristics
−
! colspan="8" | ''Stock''
 
−
|-
 
 
! colspan="2" | Max Speed<br>(km/h at 6,000 m)
 
! colspan="2" | Max Speed<br>(km/h at 6,000 m)
−
! rowspan="2" | Max altitude<br>(meters)
+
! rowspan="2" | Max altitude<br>(metres)
 
! colspan="2" | Turn time<br>(seconds)
 
! colspan="2" | Turn time<br>(seconds)
−
! colspan="2" | Rate of climb<br>(meters/second)
+
! colspan="2" | Rate of climb<br>(metres/second)
−
! rowspan="2" |Take-off run<br>(meters)
+
! rowspan="2" | Take-off run<br>(metres)
 
|-
 
|-
−
! AB
+
! AB !! RB !! AB !! RB !! AB !! RB
−
! RB
 
−
! AB
 
−
! RB
 
−
! AB
 
−
! RB
 
 
|-
 
|-
−
| 632 || 614 || 10,450 || 21.3 || 21.7 || 14.1 || 14.1 || 348
+
! Stock
 +
| 636 || 614 || rowspan="2" | {{Specs|ceiling}} || 21.0 || 21.7 || 14.1 || 14.1 || rowspan="2" | 348
 
|-
 
|-
−
! colspan="8" | ''Upgraded''
+
! Upgraded
−
|-
+
| 694 || 661 || 19.2 || 20.2 || 23.8 || 18.2
−
! colspan="2" | Max Speed<br>(km/h at 6,000 m)
 
−
! rowspan="2" |Max altitude (meters)
 
−
! colspan="2" | Turn time (seconds)
 
−
! colspan="2" | Rate of climb<br>(meters/second)
 
−
! rowspan="2" |Take-off run (meters)
 
−
|-
 
−
! AB
 
−
! RB
 
−
! AB
 
−
! RB
 
−
! AB
 
−
! RB
 
−
|-
 
−
| ? || ? || 10,450 || ??.? || ??.? || ?.? || ?.? || 348
 
 
|-
 
|-
 
|}
 
|}
  
−
====Details====
+
==== Details ====
−
{| class="wikitable" style="text-align:center"
+
{| class="wikitable" style="text-align:center" width="50%"
 
|-
 
|-
 
! colspan="5" | Features
 
! colspan="5" | Features
 
|-
 
|-
−
! Combat flap
+
! Combat flaps !! Take-off flaps !! Landing flaps !! Air brakes !! Arrestor gear
−
! Take-off flap
 
−
! Landing flap
 
−
! Air brakes
 
−
! Arrestor gear
 
 
|-
 
|-
−
| X || ✓ || ✓ || X || X    <!-- ✓ -->
+
| ✓ || ✓ || ✓ || X || X    <!-- ✓ -->
 
|-
 
|-
 
|}
 
|}
  
−
{| class="wikitable" style="text-align:center"
+
{| class="wikitable" style="text-align:center" width="50%"
 
|-
 
|-
−
! colspan="5" | Limits
+
! colspan="7" | Limits
 
|-
 
|-
−
! rowspan="2" | Wing-break speed<br>(km/h)
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! rowspan="2" | Wings (km/h)
−
! rowspan="2" | Gear limit<br>(km/h)
+
! rowspan="2" | Gear (km/h)
−
! rowspan="2" | Combat flap<br> (km/h)
+
! colspan="3" | Flaps (km/h)
 
! colspan="2" | Max Static G
 
! colspan="2" | Max Static G
 
|-
 
|-
−
! +
+
! Combat !! Take-off !! Landing !! + !! -
−
! -
 
 
|-
 
|-
−
| 735 || 320 || 530 || ~21 || ~21
+
| {{Specs|destruction|body}} || {{Specs|destruction|gear}} || 504 || 471 || 300 || ~13 || ~13
 
|-
 
|-
 
|}
 
|}
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{| class="wikitable" style="text-align:center"
 
{| class="wikitable" style="text-align:center"
 
|-
 
|-
−
! colspan="4" | Optimal velocities
+
! colspan="4" | Optimal velocities (km/h)
 
|-
 
|-
−
! Ailerons<br>(km/h)
+
! Ailerons !! Rudder !! Elevators !! Radiator
−
! Rudder<br>(km/h)
 
−
! Elevators<br>(km/h)
 
−
! Radiator<br>(km/h)
 
 
|-
 
|-
−
| < 350 || < 350 || < 440 || > 230
+
| < 400 || < 400 || < 400 || > 341
 
|-
 
|-
 
|}
 
|}
  
−
{| class="wikitable" style="text-align:center"
+
=== Survivability and armour ===
−
|-
+
{{Specs-Avia-Armour}}
−
! colspan="3" | Compressor (RB/SB)
+
<!-- ''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.'' -->
−
|-
+
 
−
! colspan="3" | Setting 1
+
* 55 mm Bulletproof Glass - Fore canopy
−
|-
+
* 66 mm Bulletproof Glass - Rear canopy/headrest (75 mm with the modification researched)
−
! Optimal altitude
+
* 8.5 mm Steel - Armour plate behind pilot's seat (10 mm  with the modification researched)
−
! 100% Engine power
+
 
−
! WEP Engine power
+
=== Modifications and economy ===
−
|-
+
{{Specs-Economy}}
−
| 1,550 m || 1670 hp || 1,958 hp
 
−
|-
 
−
! colspan="3" | Setting 2
 
−
|-
 
−
! Optimal altitude
 
−
! 100% Engine power
 
−
! WEP Engine power
 
−
|-
 
−
| 4,700 m || 1,410 hp || ?,??? hp
 
−
|-
 
−
<!--! colspan="3" | Setting 3
 
−
|-
 
−
! Optimal altitude
 
−
! 100% Engine power
 
−
! WEP Engine power
 
−
|-
 
−
| ?,??? m || ?,??? hp || ?,??? hp
 
−
|- -->
 
−
|}
 
  
−
=== Survivability and armour ===
+
Four upgrades are of importance: ''Offensive 20 mm'', ''Compressor'', ''Engine'' and ''Engine injection''.
−
<!--''Examine the survivability of the aircraft. Note how vulnerable the structure is and how secure the pilot is, whether the fuel tanks are armoured. Describe the armour, if there is any, also mention the vulnerability of other critical aircraft systems.''-->
 
−
* 55 mm Bulletproof glass in cockpit front.
 
−
* 66 mm Bulletproof glass in cockpit rear.
 
−
* 8.5 mm Steel plate in the pilot's seat.
 
  
 
== Armaments ==
 
== Armaments ==
 +
{{Specs-Avia-Armaments}}
 
=== Offensive armament ===
 
=== Offensive armament ===
−
<!--''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.''-->
+
{{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.'' -->
 
{{main|B-20S (20 mm)}}
 
{{main|B-20S (20 mm)}}
  
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=== Suspended armament ===
 
=== Suspended armament ===
−
<!--''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.''-->
+
{{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.'' -->
 
{{main|FAB-50 (50 kg)|FAB-100 (100 kg)}}
 
{{main|FAB-50 (50 kg)|FAB-100 (100 kg)}}
  
−
The '''''{{PAGENAME}}''''' can be outfitted externally with:
+
The '''''{{PAGENAME}}''''' can be outfitted with the following ordnance:
  
 +
* Without load
 
* 2 x 50 kg FAB-50 bombs (100 kg total)
 
* 2 x 50 kg FAB-50 bombs (100 kg total)
 
* 2 x 100 kg FAB-100 bombs (200 kg total)
 
* 2 x 100 kg FAB-100 bombs (200 kg total)
  
 
== Usage in battles ==
 
== Usage in battles ==
−
<!--''Describe the tactics of playing in an aircraft, the features of using vehicles in a team and advice on tactics. Refrain from creating a "guide" - do not impose a single point of view but give the reader food for thought. Examine the most dangerous enemies and give recommendations on fighting them. If necessary, note the specifics of the game in different modes (AB, RB, SB).''-->
+
<!-- ''Describe the tactics of playing in the aircraft, the features of using aircraft in a team and advice on tactics. Refrain from creating a "guide" - do not impose a single point of view, but instead, give the reader food for thought. Examine the most dangerous enemies and give recommendations on fighting them. If necessary, note the specifics of the game in different modes (AB, RB, SB).'' -->
−
The key to staying alive in the La-7 series lies in deceiving the enemy. By flying at around 4.5 km altitude you present yourself as an easy target for Boom & Zoom aircraft that are flying at higher altitudes. When you spot someone diving at you, break off and evade his burst, while slowly luring him into maneuver combat - this way you will start gaining the edge while the enemy loses his speed and momentum in the turn. Another habit worth developing in the La-7B-20 is ammo conservation - because the available load per gun shrunk compared to the [[La-7]], it is crucial to only take shots that you know will hit and aiming them carefully. This way you stand a bigger chance of critically damaging the enemy airplane. By following those rules you will soon find yourself researching the final Lavochkin piston fighter - the [[La-9]].
+
The La-7B-20 is placed quite low in the Battle Rating spread, which means that you will still engage Rank III aircraft, the majority of which you will out-perform at low altitude.
 +
 
 +
The key to staying alive in the La-7 series lies in deceiving the enemy. By flying at around 4,500 m (15,000 ft) altitude, you present yourself as an easy target for Boom & Zoom aircraft that are flying at higher altitudes. When you spot someone diving at you, break off and evade his burst, while slowly luring him to lower altitude, then engaging in manoeuvre combat - this way you will start gaining the edge while the enemy loses his speed and momentum in the turn. Another habit worth developing in the La-7B-20 is ammo conservation; because the available load per gun has decreased compared to the [[La-7]], combined with the quicker fire rate of the cannons, you can very quickly run out of ammo if you aren't careful. Thus, it is crucial to only take shots that you know will hit. By following these rules, you will soon find yourself efficiently researching the final Lavochkin piston fighter: the [[La-9]].
  
−
The aircraft are placed quite low in the Battle Rating spread, which means that you will still engage Rank III aircraft. The strengths are very good low altitude performance - ideally, you want to engage your enemies at altitudes lower than 5 km - higher up, the power output of the engine reduces drastically, making you an easy target. Aside from the speed, the La-7 possesses very good turning capabilities - while it is not as good a turner as some British and Japanese designs, it can give many German and US aircraft a run for their money.
+
One strength that you will want to take advantage of is the excellent low-altitude performance. Ideally, you want to engage your enemies at altitudes lower than 4 km. Higher up, the power output of the engine reduces drastically, making you an easy target. Aside from its speed, the La-7B-20 possesses very good turning capabilities - while it is not as good a turner as some British and Japanese designs, it can give many German and US aircraft a run for their money. Because of this manoeuvrability, good energy retention and speed, the La-7B-20 is very capable when engaging in defensive manoeuvres and duels, the latter being the ideal combat situation for the La-7.
  
−
===Manual Engine Control===
+
=== Manual Engine Control ===
 
{| class="wikitable" style="text-align:center"
 
{| class="wikitable" style="text-align:center"
 
|-
 
|-
 
! colspan="7" | MEC elements
 
! colspan="7" | MEC elements
 
|-
 
|-
−
! rowspan="2" |Mixer
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! rowspan="2" | Mixer
−
! rowspan="2" |Pitch
+
! rowspan="2" | Pitch
−
! colspan="3" |Radiator
+
! colspan="3" | Radiator
−
! rowspan="2" |Supercharger
+
! rowspan="2" | Supercharger
−
! rowspan="2" |Turbocharger
+
! rowspan="2" | Turbocharger
 
|-
 
|-
−
! Oil
+
! Oil !! Water !! Type
−
! Water
 
−
! Type  
 
 
|-
 
|-
−
| Controllable || rowspan="2" | Not controllable || rowspan="2" | Not controllable || rowspan="2" | Not controllable || rowspan="2" | Separate || rowspan="2" | Not ontrollable || rowspan="2" | Not controllable
+
| Not controllable || Controllable<br>Not auto controlled || Controllable<br>Not auto controlled || Controllable<br>Not auto controlled || Separate || Controllable<br>2 gears || Not controllable
 
|-
 
|-
 
|}
 
|}
−
 
−
===Modules===
 
−
{| class="wikitable"
 
−
!colspan = "1"|Tier
 
−
!colspan = "2"| Flight performance
 
−
!colspan = "1"| Survivability
 
−
!colspan = "1"| Weaponry
 
−
|-
 
−
| I
 
−
| Fuselage Repair
 
−
| Radiator
 
−
| Armored Glass
 
−
| DZ-40
 
−
|-
 
−
| II
 
−
|
 
−
| Compressor
 
−
| Airframe
 
−
|
 
−
|-
 
−
| III
 
−
| Wing Repair
 
−
| Engine
 
−
| Rear Plate Armor
 
−
| Offensive 20 mm
 
−
|-
 
−
| IV
 
−
|
 
−
| Engine Injection
 
−
| Cover
 
−
| New 20 mm Cannons
 
−
|-
 
−
|}
 
−
 
−
Four upgrades are of importance: ''Offensive 20 mm'', ''Compressor'', ''Engine'' and ''Engine injection''.
 
  
 
=== Pros and cons ===
 
=== Pros and cons ===
−
<!--''Summarize and briefly evaluate the vehicle in terms of its characteristics and combat effectiveness. Mark its pros and cons in the bulleted list. Try not to use more than 6 points for each of the characteristics. Avoid using categorical definitions such as "bad", "good" and the like - they have a substitution in the form of softer "inadequate", "effective".''-->
+
<!-- ''Summarise and briefly evaluate the vehicle in terms of its characteristics and combat effectiveness. Mark its pros and cons in the bulleted list. Try not to use more than 6 points for each of the characteristics. Avoid using categorical definitions such as "bad", "good" and the like - use substitutions with softer forms such as "inadequate" and "effective".'' -->
  
 
'''Pros:'''
 
'''Pros:'''
−
* Excellent low altitude performance (< 3000 m)
+
 
−
* Decent maneuverability
+
* Excellent low altitude performance (<3,000 m)
 +
* Decent manoeuvrability
 
* Great acceleration and climb
 
* Great acceleration and climb
 
* Good roll rate
 
* Good roll rate
−
* Centre-mounted cannons
+
* Centre-mounted, powerful, accurate cannons
  
 
'''Cons:'''
 
'''Cons:'''
−
* Poor performance at high altitude (> 4000 m)
+
 
 +
* Poor performance at high altitude (>4,000 m)
 
* Poor maximum dive speed
 
* Poor maximum dive speed
 
* Fast-firing cannons burn through ammunition
 
* Fast-firing cannons burn through ammunition
  
 
== 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 big, take it to a separate article, taking a link to an 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></nowiki></code>, as well as adding them at the end of the article.''-->
+
<!-- ''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).'' -->
 
The concept of a new fighter for the Soviet Air Force was pitched in 1943. While the earlier Lavochkin La-5 proved to be one of the best Soviet fighters produced up to that point, the main designer of the La-5, Semyon Lavochkin, felt that it could be improved even further. Work on a completely new fighter began in the early months of 1944. The new fighter was supposed to be an improved version of the La-5 design. The changes included the incorporation of a lighter and more durable metal airframe in place of the earlier wooden one. Other changes included the mounting of a new gun sight and propeller, as well as the strengthening of the landing gear struts and streamlining of the wings. It was to be armed with three Berezin B-20 20 mm cannons, however, the delay in production meant that most new La-7s were armed with 2 20 mm ShVAK cannons, like its predecessor. After more tests, the new fighter was accepted into serial production in late 1944.
 
The concept of a new fighter for the Soviet Air Force was pitched in 1943. While the earlier Lavochkin La-5 proved to be one of the best Soviet fighters produced up to that point, the main designer of the La-5, Semyon Lavochkin, felt that it could be improved even further. Work on a completely new fighter began in the early months of 1944. The new fighter was supposed to be an improved version of the La-5 design. The changes included the incorporation of a lighter and more durable metal airframe in place of the earlier wooden one. Other changes included the mounting of a new gun sight and propeller, as well as the strengthening of the landing gear struts and streamlining of the wings. It was to be armed with three Berezin B-20 20 mm cannons, however, the delay in production meant that most new La-7s were armed with 2 20 mm ShVAK cannons, like its predecessor. After more tests, the new fighter was accepted into serial production in late 1944.
  
−
In September 1944, the first La-7s found their way onto the front lines with the 63rd Guard Fighter Aviation Corps. The reception of the new fighter was warm - it was faster and more maneuverable than the La-5, which meant it could more efficiently tackle the most common German fighter the Soviets faced: the Messerschmitt Bf 109 G. In certain circumstances, the speed allowed the Soviet pilots to intercept Fw 190 fighter-bombers - a feat impossible to achieve for other Soviet fighters like the Yak-3. The main critiques of the design were considered to be the engine reliability and armament - the twin 20 mm ShVAK cannons were judged as inadequate in fights against better armoured Fw 190s. Still, the La-7 became one of the most successful Soviet piston fighters of World War II. Soviet ace Ivan Kozhedub scored 17 kills while flying the La-7 - his last one being an [[Me_262_A-1a|Me 262]] jet. After the war the La-7 was replaced by the La-9 prop fighter, although many were still used by other communist states as both fighters and trainer aircraft.
+
In September 1944, the first La-7s found their way onto the front lines with the 63rd Guard Fighter Aviation Corps. The reception of the new fighter was warm - it was faster and more manoeuvrable than the La-5, which meant it could more efficiently tackle the most common German fighter the Soviets faced: the Messerschmitt Bf 109 G. In certain circumstances, the speed allowed the Soviet pilots to intercept Fw 190 fighter-bombers - a feat impossible to achieve for other Soviet fighters like the Yak-3. The main critiques of the design were considered to be the engine reliability and armament - the twin 20 mm ShVAK cannons were judged as inadequate in fights against better armoured Fw 190s. Still, the La-7 became one of the most successful Soviet piston fighters of World War II. Soviet ace Ivan Kozhedub scored 17 kills while flying the La-7 - his last one being an [[Me_262_A-1a|Me 262]] jet. After the war the La-7 was replaced by the La-9 prop fighter, although many were still used by other communist states as both fighters and trainer aircraft.
 +
 
 +
{{break}}
 +
{{Navigation-Start|{{Annotation|Archive of the in-game description|An archive of the historical description of the vehicle that was presented in-game prior to Update 1.55 'Royal Armour'}}}}
 +
{{Navigation-First-Simple-Line}}
 +
A single-seat cantilever monoplane fighter with a closed cockpit and retractable landing gear with a tail wheel. The La-7 was the successor to the La-5FN.
 +
 
 +
Testing began on the experimental La-5 Benchmark 1944 in February 1944, and went into series production in May 1944 with the designation La-7.
 +
 
 +
The La-5 Benchmark 1944 underwent tests with three synchronized Berezina B-20 aviation cannons. These new cannons were large-calibre UB machine guns redesigned for use with 20 mm rounds, and were not yet in series production. They were very light (only 25 kg) but unreliable. For this reason, the test reports recommended series production of the plane with the same armament as was used on the La-5FN – two 20 mm Shpitalny-Vladimirov ShVAK cannons.
 +
 
 +
In October 1944, the B-20 cannons went into production at the Kovrov Ordnance Plant, and in January–February 1945, the La-7 underwent testing with them again. The in-flight firing results showed that the reliability of the cannons had improved, but was still lower than that of the ShVAK cannons. Nonetheless, a small batch of the fighters with three cannons (these were also called "three-pointers") was produced in the winter of 1944–1945 on the No. 381 Aviation Plant in Moscow.
 +
 
 +
The La-7 was also tested with three experimental Shpitalny SH-20 cannons, but this cannon was never adequately tuned, so it failed to make its way into the series.
 +
 
 +
The plane contained the twin-row air-cooled 14-cylinder A.D. Shvetsov ASH-82FN radial engine with a maximum output of 1,850 hp.
 +
 
 +
Its firing armament consisted of three 20 mm synchronized Berezina B-20 cannons with 130 rounds each.
 +
 
 +
The plane's bomb complement consisted of two detachable wing-mounted DZ-40 locking bomb racks, each of which could carry bombs with a calibre of up to 100 kg. It mostly used the general-purpose air-dropped FAB-50 and FAB-100 bombs, along with the ZAB-50 and ZAB-100 incendiary bombs and the AO-50 and AO-25 fragmenting bombs.
 +
 
 +
Approximately 368 planes of this model were made. Further production was stopped owing to the unsatisfactory reliability of the B-20 cannons. However, combat pilots liked the "three-pointer" La-7 and, like the test pilots, did not complain about the weaponry's operation.
 +
{{Navigation-End}}
  
 
== Media ==
 
== Media ==
−
<!--''An excellent addition to the article will be video guides, as well as screenshots from the game and photos.''-->
+
<!-- ''Excellent additions to the article would be video guides, screenshots from the game, and photos.'' -->
−
{{Youtube-gallery|RahK6Ig7xdg|DigitalDigging review|50vhTNww5Zo|Viola Games review|0-DKX-ubUvc|Messer Smitt review}}
+
 
 +
;Skins
 +
 
 +
* [https://live.warthunder.com/feed/camouflages/?vehicle=la-7b-20 Skins and camouflages for the {{PAGENAME}} from live.warthunder.com.]
 +
 
 +
;Videos
 +
{{Youtube-gallery|PUw2CQ8e0lE|'''Best Combo #1''' discusses the {{PAGENAME}} at 2:47 - ''War Thunder Official Channel''|-mO0zn_YsDo|'''Realistic: La-7B-20''' - ''Jengar''|RahK6Ig7xdg|'''La-7 & La-7 B-20S Gameplay & Review''' - ''DigitalDigging''}}
  
 
== See also ==
 
== See also ==
−
''Links to the articles on the War Thunder Wiki that you think will be useful for the reader, for example:''
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<!-- ''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;''
 
* ''reference to the series of the aircraft;''
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* ''links to approximate analogues of other nations and research trees.''
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* ''links to approximate analogues of other nations and research trees.'' -->
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;Related development
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* [[La-7 (Family)]]
  
 
== External links ==
 
== External links ==
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* ''other literature.''
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* [https://old-forum.warthunder.com/index.php?/topic/109516-lavochkin-la-7-b-20/ Official data sheet - more details about the performance]
  
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{{AirManufacturer Lavochkin}}
 
{{USSR fighters}}
 
{{USSR fighters}}

Latest revision as of 22:33, 2 August 2024

This page is about the Soviet fighter La-7B-20. For other versions, see La-7 (Family).
La-7B-20
la-7b-20.png
GarageImage La-7B-20.jpg
La-7B-20
USSR flag.png USSR
IV Rank
Battle rating:
AB RB SB
5.0 5.0 5.7
Class:
Research:54 000 Specs-Card-Exp.png
Purchase:185 000 Specs-Card-Lion.png

Description

The La-7 was originally intended to equip a set of three B-20S 20 mm cannons. However, due to reliability problems with said armament, two 20 mm ShVAK cannons were used instead, the same armament as the previous La-5 series of fighters. A total of 368 fighters equipped with B-20S cannons were produced before switching to the regular La-7. The three B-20 cannons were known as "three pointers" and were liked by test pilots.

It was introduced in Update 1.31. Compared to the regular La-7, the La-7B-20 has worse flight performance and fewer rounds per gun. However, with 3 guns instead of 2, each salvo fired is deadlier with the B-20 cannons. The aircraft has the same Shvetsov M-82FN as the La-7, the decreased flight performance can be attributed to the increased weight of the 3 x B-20 cannons. Try to use boom and zoom tactics, and stay below 4,000 m for dogfights for maximum engine performance.

General info

Flight performance

Max speed
at 6 000 m661 km/h
Turn time20 s
Max altitude10 450 m
EngineShvetsov M-82FN
TypeRadial
Cooling systemAir
Take-off weight3 t
Characteristics Max Speed
(km/h at 6,000 m) 		Max altitude
(metres) 		Turn time
(seconds) 		Rate of climb
(metres/second) 		Take-off run
(metres)
AB RB AB RB AB RB
Stock 636 614 10450 21.0 21.7 14.1 14.1 348
Upgraded 694 661 19.2 20.2 23.8 18.2

Details

Features
Combat flaps Take-off flaps Landing flaps Air brakes Arrestor gear
✓ ✓ ✓ X X
Limits
Wings (km/h) Gear (km/h) Flaps (km/h) Max Static G
Combat Take-off Landing + -
735 320 504 471 300 ~13 ~13
Optimal velocities (km/h)
Ailerons Rudder Elevators Radiator
< 400 < 400 < 400 > 341

Survivability and armour

Crew1 person
Speed of destruction
Structural735 km/h
Gear320 km/h
  • 55 mm Bulletproof Glass - Fore canopy
  • 66 mm Bulletproof Glass - Rear canopy/headrest (75 mm with the modification researched)
  • 8.5 mm Steel - Armour plate behind pilot's seat (10 mm with the modification researched)

Modifications and economy

Repair costBasic → Reference
AB2 470 → 3 144 Sl icon.png
RB5 820 → 7 408 Sl icon.png
SB8 663 → 11 027 Sl icon.png
Total cost of modifications47 100 Rp icon.png
85 900 Sl icon.png
Talisman cost1 500 Ge icon.png
Crew training52 000 Sl icon.png
Experts185 000 Sl icon.png
Aces940 Ge icon.png
Research Aces480 000 Rp icon.png
Reward for battleAB / RB / SB
90 / 210 / 440 % Sl icon.png
166 / 166 / 166 % Rp icon.png
Modifications
Flight performance Survivability Weaponry
Mods aerodinamic fuse.png
Fuselage repair
Research:
2 400 Rp icon.png
Cost:
4 400 Sl icon.png
155 Ge icon.png
Mods radiator.png
Radiator
Research:
2 400 Rp icon.png
Cost:
4 400 Sl icon.png
155 Ge icon.png
Mods compressor.png
Compressor
Research:
5 300 Rp icon.png
Cost:
9 600 Sl icon.png
340 Ge icon.png
Mods aerodinamic wing.png
Wings repair
Research:
2 900 Rp icon.png
Cost:
5 300 Sl icon.png
190 Ge icon.png
Mods new engine.png
Engine
Research:
2 900 Rp icon.png
Cost:
5 300 Sl icon.png
190 Ge icon.png
Mods metanol.png
Engine injection
Research:
5 100 Rp icon.png
Cost:
9 300 Sl icon.png
330 Ge icon.png
Mods armor glas.png
Armored glass
Research:
2 400 Rp icon.png
Cost:
4 400 Sl icon.png
155 Ge icon.png
Mods armor frame.png
Airframe
Research:
5 300 Rp icon.png
Cost:
9 600 Sl icon.png
340 Ge icon.png
Mods armor back.png
Rear armor plate
Research:
2 900 Rp icon.png
Cost:
5 300 Sl icon.png
190 Ge icon.png
Mods armor cover.png
Cover
Research:
5 100 Rp icon.png
Cost:
9 300 Sl icon.png
330 Ge icon.png
Mods pilon bomb.png
DZ-40
Research:
2 400 Rp icon.png
Cost:
4 400 Sl icon.png
155 Ge icon.png
Mods ammo.png
shvak_belt_pack
Research:
2 900 Rp icon.png
Cost:
5 300 Sl icon.png
190 Ge icon.png
Mod arrow 0.png
Mods weapon.png
b20_new_gun
Research:
5 100 Rp icon.png
Cost:
9 300 Sl icon.png
330 Ge icon.png

Four upgrades are of importance: Offensive 20 mm, Compressor, Engine and Engine injection.

Armaments

Offensive armament

Weapon 13 x 20 mm B-20S cannon
Ammunition390 rounds
Fire rate750 shots/min
Main article: B-20S (20 mm)

The La-7B-20 is armed with:

  • 3 x 20 mm B-20S cannons, nose-mounted (130 rpg = 390 total)

Suspended armament

List of setups (2)
Setup 12 x 50 kg FAB-50sv (forged) bomb
Setup 22 x 100 kg FAB-100sv (forged) bomb
Main articles: FAB-50 (50 kg), FAB-100 (100 kg)

The La-7B-20 can be outfitted with the following ordnance:

  • Without load
  • 2 x 50 kg FAB-50 bombs (100 kg total)
  • 2 x 100 kg FAB-100 bombs (200 kg total)

Usage in battles

The La-7B-20 is placed quite low in the Battle Rating spread, which means that you will still engage Rank III aircraft, the majority of which you will out-perform at low altitude.

The key to staying alive in the La-7 series lies in deceiving the enemy. By flying at around 4,500 m (15,000 ft) altitude, you present yourself as an easy target for Boom & Zoom aircraft that are flying at higher altitudes. When you spot someone diving at you, break off and evade his burst, while slowly luring him to lower altitude, then engaging in manoeuvre combat - this way you will start gaining the edge while the enemy loses his speed and momentum in the turn. Another habit worth developing in the La-7B-20 is ammo conservation; because the available load per gun has decreased compared to the La-7, combined with the quicker fire rate of the cannons, you can very quickly run out of ammo if you aren't careful. Thus, it is crucial to only take shots that you know will hit. By following these rules, you will soon find yourself efficiently researching the final Lavochkin piston fighter: the La-9.

One strength that you will want to take advantage of is the excellent low-altitude performance. Ideally, you want to engage your enemies at altitudes lower than 4 km. Higher up, the power output of the engine reduces drastically, making you an easy target. Aside from its speed, the La-7B-20 possesses very good turning capabilities - while it is not as good a turner as some British and Japanese designs, it can give many German and US aircraft a run for their money. Because of this manoeuvrability, good energy retention and speed, the La-7B-20 is very capable when engaging in defensive manoeuvres and duels, the latter being the ideal combat situation for the La-7.

Manual Engine Control

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

Pros and cons

Pros:

  • Excellent low altitude performance (<3,000 m)
  • Decent manoeuvrability
  • Great acceleration and climb
  • Good roll rate
  • Centre-mounted, powerful, accurate cannons

Cons:

  • Poor performance at high altitude (>4,000 m)
  • Poor maximum dive speed
  • Fast-firing cannons burn through ammunition

History

The concept of a new fighter for the Soviet Air Force was pitched in 1943. While the earlier Lavochkin La-5 proved to be one of the best Soviet fighters produced up to that point, the main designer of the La-5, Semyon Lavochkin, felt that it could be improved even further. Work on a completely new fighter began in the early months of 1944. The new fighter was supposed to be an improved version of the La-5 design. The changes included the incorporation of a lighter and more durable metal airframe in place of the earlier wooden one. Other changes included the mounting of a new gun sight and propeller, as well as the strengthening of the landing gear struts and streamlining of the wings. It was to be armed with three Berezin B-20 20 mm cannons, however, the delay in production meant that most new La-7s were armed with 2 20 mm ShVAK cannons, like its predecessor. After more tests, the new fighter was accepted into serial production in late 1944.

In September 1944, the first La-7s found their way onto the front lines with the 63rd Guard Fighter Aviation Corps. The reception of the new fighter was warm - it was faster and more manoeuvrable than the La-5, which meant it could more efficiently tackle the most common German fighter the Soviets faced: the Messerschmitt Bf 109 G. In certain circumstances, the speed allowed the Soviet pilots to intercept Fw 190 fighter-bombers - a feat impossible to achieve for other Soviet fighters like the Yak-3. The main critiques of the design were considered to be the engine reliability and armament - the twin 20 mm ShVAK cannons were judged as inadequate in fights against better armoured Fw 190s. Still, the La-7 became one of the most successful Soviet piston fighters of World War II. Soviet ace Ivan Kozhedub scored 17 kills while flying the La-7 - his last one being an Me 262 jet. After the war the La-7 was replaced by the La-9 prop fighter, although many were still used by other communist states as both fighters and trainer aircraft.


Archive of the in-game description

A single-seat cantilever monoplane fighter with a closed cockpit and retractable landing gear with a tail wheel. The La-7 was the successor to the La-5FN.

Testing began on the experimental La-5 Benchmark 1944 in February 1944, and went into series production in May 1944 with the designation La-7.

The La-5 Benchmark 1944 underwent tests with three synchronized Berezina B-20 aviation cannons. These new cannons were large-calibre UB machine guns redesigned for use with 20 mm rounds, and were not yet in series production. They were very light (only 25 kg) but unreliable. For this reason, the test reports recommended series production of the plane with the same armament as was used on the La-5FN – two 20 mm Shpitalny-Vladimirov ShVAK cannons.

In October 1944, the B-20 cannons went into production at the Kovrov Ordnance Plant, and in January–February 1945, the La-7 underwent testing with them again. The in-flight firing results showed that the reliability of the cannons had improved, but was still lower than that of the ShVAK cannons. Nonetheless, a small batch of the fighters with three cannons (these were also called "three-pointers") was produced in the winter of 1944–1945 on the No. 381 Aviation Plant in Moscow.

The La-7 was also tested with three experimental Shpitalny SH-20 cannons, but this cannon was never adequately tuned, so it failed to make its way into the series.

The plane contained the twin-row air-cooled 14-cylinder A.D. Shvetsov ASH-82FN radial engine with a maximum output of 1,850 hp.

Its firing armament consisted of three 20 mm synchronized Berezina B-20 cannons with 130 rounds each.

The plane's bomb complement consisted of two detachable wing-mounted DZ-40 locking bomb racks, each of which could carry bombs with a calibre of up to 100 kg. It mostly used the general-purpose air-dropped FAB-50 and FAB-100 bombs, along with the ZAB-50 and ZAB-100 incendiary bombs and the AO-50 and AO-25 fragmenting bombs.

Approximately 368 planes of this model were made. Further production was stopped owing to the unsatisfactory reliability of the B-20 cannons. However, combat pilots liked the "three-pointer" La-7 and, like the test pilots, did not complain about the weaponry's operation.


Media

Skins
Videos
Best Combo #1 discusses the La-7B-20 at 2:47 - War Thunder Official Channel
Realistic: La-7B-20 - Jengar
La-7 & La-7 B-20S Gameplay & Review - DigitalDigging

See also

Related development

External links


Lavochkin Design Bureau (Лавочкинa Опытное конструкторское бюро)
LaGG-3*  I-301 · LaGG-3-4 · LaGG-3-8 · LaGG-3-11 · LaGG-3-23 · LaGG-3-34 · LaGG-3-35 · LaGG-3-66
La-5/7  La-5 · La-5F · La-5FN · La-7 · Dolgushin's La-7 · La-7B-20
La-9/11  La-9 · La-11
Jet Fighters  La-15 · La-174 · La-200
Export  ␗La-9 · ␗La-11
Captured  ▀La-5FN
  *Lavochkin-Gorbunov-Gudkov (Лавочкин-Горбунов-Гудков), head designer V. P. Gorbunov

USSR fighters
I-15  I-15 WR · I-15 M-22 · I-15 M-25 · I-15bis · Krasnolutsky's I-15bis
  I-153 M-62 · Zhukovsky's I-153-M62 · I-153P
I-16  I-16 type 5 · I-16 type 10 · I-16 type 18 · I-16 type 24 · I-16 type 27 · I-16 type 28 · I-180S
I-29  I-29
I-185  I-185 (M-71) · I-185 (M-82)
I-225  I-225
ITP  ITP (M-1)
MiG-3  MiG-3-15 · MiG-3-15 (BK) · MiG-3-34
LaGG  I-301 · LaGG-3-4 · LaGG-3-8 · LaGG-3-11 · LaGG-3-23 · LaGG-3-34 · LaGG-3-35 · LaGG-3-66
La  La-5 · La-5F · La-5FN · La-7 · Dolgushin's La-7 · La-7B-20 · La-9 · La-11
Yak-1/7  Yak-1 · Yak-1B · Yak-7B
Yak-3  Yak-3 · Eremin's Yak-3(e) · Yak-3P · Yak-3T · Yak-3U · Yak-3 (VK-107)
Yak-9  Yak-9 · Yak-9B · Golovachev's Yak-9M · Yak-9T · Yak-9K · Yak-9U · Yak-9UT · Yak-9P
Other countries  ▂P-40E-1 · ▂P-47D-27 · ▂Hurricane Mk IIB · ▂Fw 190 D-9 · ▂Spitfire Mk IXc
P-39  ▂P-39K-1 · ▂Pokryshkin's P-39N-0 · ▂P-39Q-15
P-63  ▂P-63A-5 · ▂P-63A-10 · ▂P-63C-5

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