Vukolov, B. – Soviet Fighters (1973)

Original Title: «Советские истребители» («Soviet Fighters»)
Authors: V.S. Voukolov (Air Force Colonel, specialist in air combat tactics) and N.G. Konkov (Colonel Engineer, expert in aeronautical engineering).
Publisher: DOSAAF (Voluntary Society for Cooperation with the Army, Aviation, and Fleet), a central organization for military and technical training in the USSR.
Year of Publication: 1973 (Soviet Union).

This work adopts a pedagogical and technical approach with the following main objectives:

1. Systematic analysis of the strategic role, design principles, armament systems, and onboard equipment of modern Soviet fighters (1970s).

2. Highlighting technological milestones achieved by the USSR in combat aviation, as well as their impact on military doctrine and their contribution to global aeronautical innovation.

3. Serving as a reference for aviation students, future military pilots, and researchers in the history of technology, while also honoring the scientific and industrial heritage of the Soviet Union.

Thus, this work targets an academic audience, including instructors, officer cadets, and specialists in air warfare strategy.

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Part 1: Introduction – The Central Role of Fighter Aviation in Soviet Military Doctrine

Historical Context: The Soviet Air Forces (VVS) in 1973

At the dawn of the 1970s, the Soviet Air Forces (VVS – Voenno-Vozdushnye Sily) occupied a central position in the deterrence strategy and protection of national territory. In this context, fighter aviation constituted an indispensable pillar, ensuring:

• Air superiority in contested spaces;

• Protection of critical infrastructure (cities, military bases, industrial sites);

• Neutralization of enemy air threats, particularly in the context of the Cold War and the arms race with the United States.

Thus, fighter aviation was perceived as the backbone of air defense, a concept formalized under the term PVO (Protivo-Vozdushnaya Oborona – Air Defense).

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Part 2: History of Soviet Fighter Aviation – Technological and Strategic Evolution

1. The Beginnings (1914–1918): The Birth of a New Weapon

World War I marked the rise of military aviation as a decisive factor on the battlefield. Although the USSR did not yet exist as a state, it inherited the first Russian experiences in air combat, particularly with aircraft such as the Sikorsky S-16, used for reconnaissance missions and later for fighter roles.

Pyotr Nesterov, a pioneer of Russian aviation, is recognized for performing the first intentional ramming (Taran) in 1914, a desperate but symbolically significant tactic demonstrating pilots' unwavering commitment to defending their homeland.

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2. Russian Civil War (1918–1922): Nesterov’s Legacy and the Consolidation of Tactics

The Russian Civil War (1918–1922) saw the increasing use of aircraft for offensive and defensive purposes. The Bolsheviks, aware of the strategic importance of aviation, created fighter squadrons equipped with aircraft such as the SPAD S.XIII (of French origin) and the Sikorsky S-16.

Nesterov’s legacy lived on through pilot training and the development of air combat tactics, which were refined in the following decades.

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3. The 1930s: Accelerated Modernization and Preparation for an Inevitable Conflict

The decade of the 1930s was marked by rapid modernization of Soviet aviation, driven by the following factors:

• Fear of external aggression (particularly from Nazi Germany);

• The desire to catch up with the technological gap relative to Western powers;

• Mass industrialization under Stalin’s Five-Year Plans.

Aircraft such as the Polikarpov I-15 (biplane) and the Polikarpov I-16 (monoplane with retractable landing gear) were developed, laying the foundations for modern fighters. Although these aircraft were limited in performance, they allowed Soviet pilots to gain valuable operational experience.

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4. Great Patriotic War (1941–1945): The Golden Age of Soviet Fighter Aviation

World War II (referred to as the Great Patriotic War in the USSR) represented a decisive turning point for Soviet fighter aviation. Facing the German invasion (Operation Barbarossa, June 1941), the USSR had to accelerate production and improve the performance of its fighters to counter the Luftwaffe, then considered the best air force in the world.

Soviet Aces: An Elite in Combat

The table below presents the most decorated pilots of Soviet fighter aviation, whose exploits marked military history:

Pilot	Number of Victories	Distinction	Iconic Aircraft	Strategic Contribution
Alexander Pokryshkin	59	Triple Hero of the USSR	Airacobra P-39	Developed group fighter tactics still taught today.
Ivan Kozhedub	62	Triple Hero of the USSR	La-5, La-7	Top Allied ace of World War II, specialist in combat against Messerschmitt Bf 109 and Fw 190.
Kirill Evstigneev	56	Double Hero of the USSR	Yak-1, Yak-3	Participated in the Battle of Kursk (1943), one of the largest air battles in history.
Alexander Aliukhin	40 (individual) + 17 (group)	Double Hero of the USSR	Yak-1	Known for his precision shooting skills and leadership within squadrons.
Dmitri & Boris Glinka	73 (combined)	Brothers, one Double Hero	La-5	Legendary duo, symbol of fraternal cooperation in combat.
Anatoli Gorovets	9 in a single battle (Battle of Kursk)	Hero of the USSR	Yak-1	Achieved one of the highest single-mission victory tallies of the war.

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Legendary Aircraft of World War II

Soviet fighters of this period were distinguished by their simplicity, robustness, and combat effectiveness. The following table summarizes their technical characteristics and operational advantages:

Model	Manufacturer	Max Speed	Standard Armament	Technical Features	Operational Impact
Yak-1 (1940)	Yakovlev	580 km/h	1 × 20 mm ShVAK cannon + 2 × 7.62 mm ShKAS machine guns	Light and agile, wood and metal structure.	Superior speed compared to Messerschmitt Bf 109 at low altitude.
La-5 (1942)	Lavochkin	600 km/h	2 × 20 mm ShVAK cannons	Radial engine (air-cooled), wooden fuselage.	Excellent maneuverability, suitable for dogfights.
Yak-3 (1943)	Yakovlev	660 km/h	1 × 20 mm ShVAK cannon + 2 × 12.7 mm Berezin UB machine guns	Exceptional power-to-weight ratio.	Considered the best Soviet fighter of the war at low and medium altitude.
La-7 (1944)	Lavochkin	680 km/h	3 × 20 mm Berezin B-20 cannons	Klimov VK-107 engine, aerodynamic improvements.	Best Soviet fighter in terms of overall performance.

Strategic Result: From 1943 onwards, the USSR managed to establish air superiority on the Eastern Front, contributing decisively to the defeat of the Luftwaffe. This period also marked the beginning of Soviet dominance in fighter design, with a doctrine focused on simplicity, robustness, and mass production.

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5. Post-War Period (1945–1973): The Jet Age and the Technological Race

The end of World War II marked the beginning of a new era for fighter aviation, characterized by:

• The advent of jet engines;

• The race for supersonic speed;

• Adaptation to new threats (strategic bombers, ballistic missiles).

Iconic Aircraft of the Jet Era

• MiG-15 (1947): First Soviet supersonic fighter (Mach 1.03), inspired by German research on swept wings. Impact: Forced the United States to accelerate the development of the F-86 Sabre.

• MiG-17 (1950): Improvement over the MiG-15 with more swept wings and a top speed of 1,100 km/h. Deployment: Widely used during the Korean War (1950–1953).

• MiG-21 (1959): First Soviet fighter capable of Mach 2, one of the most produced combat aircraft in history (over 11,000 units). Doctrine: Designed for high-altitude interception and air superiority.

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6. Evolution of Aeronautical Structures: A Technological Revolution

The evolution of aeronautical structures between the 1920s and 1950s illustrates a logical progression toward increasingly high-performance and aerodynamically optimized configurations. The following table summarizes this evolution:

Period	Wing Type	Max Speed	Representative Example	Encountered Problems	Solutions Implemented
1920s	Biplane (2 wings)	~230 km/h	R-5 (Polikarpov)	High drag (cables, struts, complex structure).	Gradual phase-out in favor of monoplanes.
1930s	Monoplane (1 wing)	~370 km/h	I-153 "Chaika"	Fixed landing gear → residual drag.	Introduction of retractable landing gear (1940s).
1940s	Monoplane with retractable landing gear	~600 km/h	Yak-3	40% drag reduction compared to earlier models.	Aerodynamic optimization for high-speed combat.
1950s	Swept Wings	Mach 1+	MiG-15	Solution to the sound barrier through drag reduction at high speed.	Widespread adoption for supersonic fighters.

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Why Swept Wings? An Aerodynamic Analysis

The adoption of swept wings in the 1950s addressed physical imperatives associated with supersonic flight:

1. Drag Reduction: The swept shape delays the onset of shock waves, allowing the aircraft to exceed Mach 1 without suffering a sudden loss of lift.

2. Improved Stability: A swept wing provides better directional stability at high speeds, reducing the risk of stalling or loss of control.

3. Optimized Lift-to-Drag Ratio: This configuration allows for a better compromise between maximum speed and maneuverability.

Consequence: Fighters like the MiG-15 and MiG-17 were able to dominate the skies during the Cold War thanks to their aerodynamic superiority.

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Composition of a Modern Wing (Example: MiG-17)

A modern wing, such as that of the MiG-17, consists of the following structural elements:

• Main Spar: Load-bearing element that supports bending and torsional loads.

• Ribs: Transverse structures that maintain the shape of the airfoil profile.

• Skin: External surface made of lightweight alloys (e.g., duralumin), ensuring an optimal aerodynamic surface.

• Ailerons: Movable surfaces that enable roll control.

• Flaps: Retractable devices that increase lift at low speeds (landing, takeoff).

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The Tail: Stabilization and Control System

The tail, located at the rear of the aircraft, plays a crucial role in stability and control:

• Vertical Stabilizer (Rudder): Enables yaw control (movement around the vertical axis).

• Horizontal Stabilizer (Elevator): Controls pitch (movement around the lateral axis).

• Fin: Provides directional stability in flight.

Note: The tails of Soviet fighters were often reinforced to withstand the extreme maneuvers typical of air combat.

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Part 3: The Evolution of Aircraft Engines – From Piston to Jet Propulsion

1. The Turbojet (TRD) – Standard Engine for Modern Fighters

The turbojet (TurboReaktivnyy Dvigatel, TRD) became the standard powerplant for fighters starting in the 1950s. Its operating principle is based on the following four phases:

1. Air Intake: Air is drawn in through an intake and compressed.

2. Compression: A compressor (axial or centrifugal) increases the air pressure before combustion.

3. Combustion: Fuel (kerosene) is injected into the combustion chamber, where it mixes with compressed air and ignites.

4. Exhaust and Thrust: Hot gases exit at high speed through the nozzle, generating thrust in accordance with Newton’s Third Law (action-reaction).

Advantages:

• High thrust-to-weight ratio;

• Supersonic cruise speed;

• Increased reliability compared to piston engines.

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2. Improvements for Supersonic Flight

To enable fighters to exceed Mach 1, several technological innovations were introduced:

• Afterburner (Formsazhiganie): Injection of additional fuel into the exhaust gases, increasing thrust by 30–50% (used in MiG-19 and MiG-21).

• Adjustable Nozzle: Optimizes thrust depending on speed and altitude.

• Lightweight Materials: Titanium and high-strength alloys reduce the engine weight while improving durability.

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3. Other Types of Jet Engines

In addition to conventional turbojets, the USSR explored other propulsion technologies:

• Turbofan: More fuel-efficient at subsonic speeds, primarily used in bombers and transport aircraft.

• Rocket Engine: Provides extreme thrust for short durations, used in experimental aircraft such as the BI-1 (1942).

• Ramjet (Pul’siruyushchiy Vozdushno-Reaktivnyy Dvigatel, PVD): No moving parts, uses the forward motion of the aircraft to compress air. Application: Cruise missiles like the KSR-5.

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4. History of Jet Engines in the USSR – A Chronology of Innovations

Year	Event	Key Figures	Impact
1903	Theoretical foundation of the rocket engine by Konstantin Tsiolkovsky.	Konstantin Tsiolkovsky	Laid the theoretical foundations for rocket propulsion.
1932	Construction of the first Soviet rocket engine (OR-1).	Friedrich Zander	First operational liquid-fuel rocket engine in the USSR.
1942	First flight of a rocket-powered aircraft (BI-1).	Bereznyak & Isaev (designers), Grigoriy Bakhchivandzhi (pilot)	Practical demonstration of rocket propulsion. Note: Bakhchivandzhi died in 1943 during a test flight.
1946	First Soviet turbojets (copies of the German Jumo 004).	Soviet Engineers (e.g., Vladimir Klimov)	Beginning of mass production of jet engines.
1950s	Development of original Soviet engines (e.g., VK-1 for the MiG-15).	Klimov Design Bureau	Technological independence from foreign designs.

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Part 4: Fighter Armament – Evolution and Innovation

1. Evolution of Air Armament: From Machine Guns to Missiles

The armament of Soviet fighters underwent major evolution over the decades, reflecting technological progress and operational needs:

• 1910s–1930s: Machine guns (7.62 mm, 12.7 mm), ineffective against armored aircraft.

• 1940s: Automatic cannons (20 mm, 23 mm, 37 mm), capable of penetrating the armor of enemy bombers.

• 1950s–1970s:

  • Improved automatic cannons (e.g., NR-23, N-37D);

  • Air-to-air missiles (e.g., K-5, K-13), enabling long-range intercepts.

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2. The Armament of the MiG-17 – An Example of Precision and Firepower

The MiG-17, one of the most iconic fighters of the USSR, was equipped with formidable armament:

• Cannons:

  • 2 × NR-23 (23 mm): Firing rate of 1,200 rounds/minute, effective against medium targets (fighters, light bombers).

  • 1 × N-37D (37 mm): Heavy cannon designed to penetrate armor of heavy bombers (e.g., B-29).

• Sight: ASP-3NM (gyroscopic), with an automatic correction system to compensate for aircraft movements.

• Ammunition:

  • Armor-piercing shells (AP): For armored aircraft;

  • High-explosive shells (HE): For ground targets (vehicles, infrastructure).

Tactical Advantage: This combination allowed the MiG-17 to effectively neutralize both enemy fighters and strategic bombers.

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3. Operation of Automatic Cannons

The automatic cannons used in Soviet fighters operated on advanced mechanical principles:

• Gas-operated mechanism: Uses the pressure of gases generated by firing to cycle the next round.

• Recoil-operated mechanism: Uses the recoil of the weapon to eject the casing and load new ammunition.

• High rate of fire: Some models reached 1,800 rounds/minute, ensuring optimal fire density in combat.

• Electric or pneumatic loading: Provided increased reliability, even under extreme conditions (low temperatures, high altitudes).

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4. The Gunsight: Precision and Automation

The aiming systems of Soviet fighters underwent significant evolution, from simple optical sights to advanced gyroscopic systems:

• Gyroscopic Sight ASP-3NM:

  • Automatically compensates for aircraft movements;

  • Calculates firing correction based on speed and distance of the target.

• Radar assistance (in later models like the MiG-21):

  • Enables detection and tracking of targets in all weather conditions;

  • Increases effective range of weapons.

• Automatic lead calculation:

  • Takes into account the relative speed between fighter and target;

  • Anticipates target movements for precise shooting.

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Part 5: Onboard Equipment – Technology and Ergonomics

1. Radar: The Electronic Eyes of the Fighter

Radar revolutionized detection and target tracking in combat aviation. The following table compares the radar systems used by the main fighters of the 1970s:

Radar Model	Associated Fighter	Detection Range	Features	Limitations
RP-1	MiG-17	12 km	Detection of aircraft and ships.	Limited range, vulnerable to countermeasures.
AN/APQ-100	F-4 Phantom (USA)	50 km	Advanced tracking, air-to-air and air-to-ground modes.	High complexity, prohibitive cost.
Cyrano II	Mirage III (France)	50 km	Multi-mode operation (search, track).	Less effective in jamming environments.

Analysis: Although Soviet radar systems like the RP-1 had a shorter range than their Western counterparts, their simplicity and robustness made them suited to the operational conditions of the USSR (harsh climate, limited maintenance).

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2. Flight Instruments – Navigation and Control

Flight instruments are essential for ensuring the safety and efficiency of missions. The following devices were used in Soviet fighters:

• Altimeter: Measures altitude above sea level or ground. Accuracy: ±10 meters.

• Airspeed Indicator: Displays airspeed (in km/h or knots). Importance: Prevents stalls or exceeding maximum speed.

• Artificial Horizon (Gyrohorizon): Displays the attitude of the aircraft (pitch, roll). Operation: Based on a stabilized gyroscope.

• Turn and Slip Indicator: Measures turn rate and coordination of the pilot. Usefulness: Prevents loss of control in tight turns.

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3. The Artificial Horizon (Gyrohorizon) – An Indispensable Tool

The artificial horizon is one of the most critical instruments for instrument flight (IFR – Instrument Flight Rules). Its key features include:

• Gyroscope-stabilized display: Maintains a horizontal reference even during sudden aircraft movements.

• Indispensable in low visibility: Allows the pilot to maintain control of the aircraft in the absence of visual references (night, fog, clouds).

• Widespread use: Present in all modern fighters (MiG-15, MiG-17, MiG-21, etc.).

Academic Note: The gyroscope used in these systems is a perfect example of the application of rotational physics principles in aeronautical engineering.

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4. The Cockpit – Ergonomics and Safety

The cockpit of Soviet fighters was designed to optimize ergonomics and safety for the pilot. Its key elements included:

• Ejection Seat: Allowed the pilot to exit the aircraft in emergencies (e.g., failure or lost combat). Mechanism: Powered by rocket or pyrotechnic cartridge.

• Head-Up Display (HUD): Projected flight data (speed, altitude, target) directly onto the windscreen, allowing the pilot to keep their eyes outside. Use: Introduced in later models like the MiG-21.

• Oxygen System: Pure oxygen supply for flights at high altitudes (above 5,000 meters).

• Radio Communication: Secure and encrypted system for communication with ground stations and other aircraft.

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Part 6: Conclusion – The Technological and Strategic Legacy of Soviet Fighters

1. Technological Assessment (1973) – A Revolution in Progress

By 1973, the USSR had closed its initial gap with Western powers and had become a global leader in combat aviation. This success can be attributed to several key factors:

• Massive investments in research and development (aerodynamics, engines, armament);

• Mass production, enabling numerical superiority;

• Rigorous training of pilots, including advanced simulators and intensive air combat exercises.

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2. Lessons and Future Perspectives

The analysis of the evolution of Soviet fighters allows us to draw four major lessons:

1. Continuous Innovation as a Strategic Imperative:

   • The USSR succeeded in closing the gap with Western countries (Germany, USA) in just 20 years (1920–1940), thanks to a determined policy of technological development.

   • Absolute priority given to basic research (aerodynamics, metallurgy, propulsion).

2. The Critical Importance of Pilot Training:

   • Soviet pilots underwent intensive training, which included:

     • Flight simulators to master complex situations;

     • Aerobatic exercises to improve maneuverability;

     • Simulated combat missions to refine tactics.

3. Numerical Superiority as a Decisive Advantage:

   • The USSR produced fighters in mass quantities, with lower costs due to standardized production. Example: Over 18,000 MiG-15s were manufactured, a world record.

4. Adaptation to New Geopolitical Threats:

   • Cold War: Development of interceptors (e.g., MiG-25, capable of Mach 3) to counter American strategic bombers (B-52, B-1).

   • Ballistic Threat: Deployment of air defense systems (S-75, S-200) to protect Soviet territory.

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3. Synthesis: The Five Pillars of Soviet Fighters

The excellence of Soviet fighters is based on five fundamental pillars, which allowed the USSR to dominate the field of military aviation for several decades:

1. Aerodynamics:

   • Swept Wings: Enable breaking the sound barrier (Mach 1) by reducing drag and improving stability.

   • Thin Profiles: Optimize the lift-to-drag ratio, thus increasing energy efficiency.

2. Engines:

   • Turbojets: Provide superior thrust compared to piston engines, enabling supersonic speeds.

   • Afterburners: Increase thrust by 30–50%, essential for high-altitude intercepts.

3. Armament:

   • Automatic Cannons (23 mm, 37 mm): High precision and firepower, suitable for close combat.

   • Gyroscopic Sights (e.g., ASP-3NM): Automatic correction for precise shooting, even in difficult conditions.

4. Onboard Equipment:

   • Radar: All-weather detection, enabling 24/7 operations.

   • Gyroscopic Instruments: Instrument Flight (IFR), essential for high-altitude missions or in bad weather.

5. Pilot Training:

   • Intensive Training: Preparation for real combat situations.

   • Mastery of Air Combat Tactics: Tactical superiority over opponents.

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4. Comparison with Western Fighters (1973) – An Objective Analysis

The following table provides a detailed comparison between Soviet, American, and European fighters in 1973, based on technical and operational criteria:

Criteria	USSR (MiG-17, MiG-21)	USA (F-100, F-4 Phantom)	Europe (Mirage III, Lightning)
Max Speed	Mach 1.1–2.0	Mach 1.5–2.2	Mach 2.0–2.2
Operational Ceiling	15,000–20,000 m	15,000–20,000 m	18,000–20,000 m
Primary Armament	Cannons (23 mm, 37 mm) + Missiles (K-5, K-13)	Missiles (AIM-9 Sidewinder, AIM-7 Sparrow)	Cannons (30 mm) + Missiles (Matra 550)
Radar Range	RP-1 (12 km)	AN/APQ-100 (50 km)	Cyrano II (50 km)
Maneuverability	Excellent (swept wings, lightweight design)	Good (swept wings, high weight)	Very Good (optimized aerodynamics)
Production Cost	Low (mass production, simple materials)	High (advanced technologies, high R&D costs)	Moderate (balance between performance and cost)
Military Doctrine	Interceptor (air defense, PVO)	Air Superiority (air dominance)	Multirole (operational versatility)

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Advantages and Disadvantages of Soviet Fighters

Advantages:
✅ Robustness and Simplicity: Soviet fighters were designed to withstand extreme conditions (harsh climate, limited maintenance), making them reliable and easy to maintain.
✅ Mass Production: Thanks to standardized production, the USSR could manufacture thousands of aircraft at lower costs, ensuring numerical superiority on the battlefield.
✅ Adaptation to Operational Needs: Fighters were optimized for specific missions (interception, air superiority), thus meeting the requirements of Soviet military doctrine.

Disadvantages:
❌ Less Advanced Electronics: Soviet radar and avionics systems lagged technologically behind those of the USA and Western Europe, limiting their effectiveness in certain scenarios.
❌ Limited Comfort and Ergonomics: Cockpits were often less sophisticated than their Western counterparts, which could fatigue pilots during prolonged missions.

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5. Summary in Ten Key Points – An Academic Synthesis

To conclude this analysis, here are ten fundamental points that summarize the evolution and impact of Soviet fighters:

1. Birth of Combat Aviation: Soviet fighter aviation traces its origins to 1914 with Pyotr Nesterov, whose heroic ramming marked the beginning of modern air combat tactics.

2. Rise of Monoplanes (1930–1940): Monoplane fighters (I-16, Yak-1, La-5) revolutionized Soviet aviation, enabling it to dominate World War II thanks to their speed and maneuverability.

3. Golden Age of Soviet Aces: Pilots like Pokryshkin and Kozhedub shot down hundreds of enemy aircraft, demonstrating exceptional tactical mastery and contributing to the legend of Soviet aviation.

4. Transition to Jet Engines (1945–1950): The shift to jet engines (MiG-15, MiG-17) allowed the USSR to break the sound barrier and compete with the USA in the aeronautical technology race.

5. Aerodynamics as the Key to Success: The introduction of swept wings and thin profiles enabled Soviet fighters to achieve supersonic speeds (Mach 2) while maintaining excellent maneuverability.

6. Evolution of Armament: The transition from machine guns to automatic cannons (NR-23, N-37D) and air-to-air missiles transformed the offensive capabilities of fighters, allowing them to neutralize diverse targets.

7. Gyroscopic Sights and Radar: Systems like the ASP-3NM and RP-1 enabled precise shooting day and night, in all weather conditions, thus expanding the operational scope.

8. Onboard Equipment and Safety: Flight instruments (artificial horizon, altimeter) and ejection seats improved pilot safety, even under extreme conditions.

9. Soviet Doctrine: Simplicity and Robustness: The USSR prioritized mass production, simple designs, and robust aircraft, ensuring numerical superiority and operational reliability.