Engineering technology

From Hearts of Iron 4 Wiki
Jump to: navigation, search

Engineering technology unlocks radar, nuclear weapons, jet and rocket engines, and improves research speed, encryption, decryption, and rocket artillery attack.

Technology[edit]

Engineering technology is separate from industrial technology, meaning the player must hire an engineering design company in order to get research bonuses for engineering technology research.

Electronic Engineering[edit]

This tree unlocks radar, radio, and improves research speed, encryption, and decryption.

Icon Technology Date Prerequisites Effects
Electronic Mechanical Engineering.png Electronic Mechanical Engineering 1936 None -2% Research time
Radio.png Radio 1936 Electronic Mechanical Engineering +5% Reinforce rate, unlocks Signal Company research
Radio Detection.png Radio Detection 1936 Radio Unlocks Radar station.png with a limit of 1 per state
Decimetric Radar.png Decimetric Radar 1938 Radio Detection Increases Radar station.png state limit to 2
Improved Decimetric Radar.png Improved Decimetric Radar 1939 Decimetric Radar Increases Radar station.png state limit to 3
Centimetric Radar.png Centimetric Radar 1940 Improved Decimetric Radar Increases Radar station.png state limit to 4
Improved Centimetric Radar.png Improved Centimetric Radar 1941 Centimetric Radar Increases Radar station.png state limit to 5
Advanced Centimetric Radar.png Advanced Centimetric Radar 1942 Improved Centimetric Radar Increases Radar station.png state limit to 6
Mechanical Computing.png Mechanical Computing 1936 Electronic Mechanical Engineering -3% Research time
Computing Machine.png Computing Machine 1938 Mechanical Computing -3% Research time
Encryption - Polyalphabetical Ciphers.png Encryption - Polyalphabetical Ciphers 1938 Computing Machine +1 Encryption
Decryption - Frequency Analysis.png Decryption - Frequency Analysis 1938 Computing Machine +1 Decryption
Improved Computing Machine.png Improved Computing Machine 1940 Computing Machine -5% Research time
Encryption - Cyclic Permutations.png Encryption - Cyclic Permutations 1940 Improved Computing Machine +1 Encryption
Decryption - Side-channel Attack.png Decryption - Side-channel Attack 1940 Improved Computing Machine +1 Decryption
Advanced Computing Machine.png Advanced Computing Machine 1942 Improved Computing Machine -5% Research time
Encryption - Pulse-code Modulation.png Encryption - Pulse-code Modulation 1942 Advanced Computing Machine +1 Encryption
Decryption - Automated Deduction.png Decryption - Automated Deduction 1942 Advanced Computing Machine +1 Decryption

Atomic Research and Experimental Rockets[edit]

This tree focuses on nuclear technology and jet/ rocket engines.

Icon Technology Date Prerequisites Effect Base Research Time
Atomic Research.png Atomic Research 1940 None -2% Research time 500
Nuclear Reactor.png Nuclear Reactor 1943 Atomic Research Unlocks Nuclear reactor.png with a limit of 1 per state 500
Nuclear Bombs.png Nuclear Bombs 1945 Nuclear Reactor Enables Nuclear Bombs 500
Experimental Rockets.png Experimental Rockets 1943 None Unlocks Rocket site.png with a limit of 2 per state 150
Rocket Engines.png Rocket Engines 1944 Experimental Rockets Enables Rocket Interceptor and Guided Missile, +5% Soft attack for Support Rocket Artillery Rocket Artillery Motorized rocket brigade.png
Jet Engines.png Jet Engines 1944 Rocket Engines Allows the research of jet aircraft
Improved Rocket Engines.png Improved Rocket Engines 1945 Rocket Engines Enables Rocket Interceptor II and Guided Missile II, +5% Soft attack for Support Rocket Artillery Rocket Artillery Motorized rocket brigade.png
Advanced Rocket Engines.png Advanced Rocket Engines 1946 Improved Rocket Engines Enables Rocket Interceptor III and Guided Missile III, +5% Soft attack for Support Rocket Artillery Rocket Artillery Motorized rocket brigade.png
Research
Land Infantry · Support Companies · Armor · Artillery · Land Doctrine
Air Naval · Naval Doctrine
Naval Air · Air Doctrine
Industry Engineering · Industry