Air

All 41 Air research technologies from HOI4 v1.19 — real costs, years, prerequisites and unlocks mined from the game files.

Air technologies (41 entries)
Tech	Cost	Year	Prerequisites	Leads to	Unlocks	Effects
`Aircraft Construction` aircraft_construction	1	1936	Engines I	—	Modules: `dive_brakes_small`, `non_strategic_materials_small`, `floats`, `non_strategic_materials_medium`, `flying_boat_medium`, `non_strategic_materials_large`, `flying_boat_large`	—
`Light MG` aa_lmg	1	1922	—	Heavy MG, Cannons I, Survivability Studies	Modules: `light_mg_2x`, `light_mg_4x`, `lmg_defense_turret`, `lmg_defense_turret_2x`	—
`Air Launched Torpedoes` air_torpedoe_1	1	1936	—	Improved Air Launched Torpedoes	Modules: `torpedo_mounting`	—
`Bombs` early_bombs	1	1922	—	Armor Piercing Bombs, Heavy Bombs	Modules: `bomb_locks`, `small_bomb_bay`, `medium_bomb_bay`, `large_bomb_bay`	—
`Engines I` engines_1	1	1922	—	Engines II, Range Improvements, Aircraft Construction	Modules: `engine_1_1x`, `engine_1_2x`, `engine_1_3x`, `engine_1_4x`, `engine_1_6x`	—
$large_plane_airframe_0$ iw_large_airframe	2	1926	—	$large_plane_airframe_1$	Equipment: `large_plane_airframe_0`, `large_plane_maritime_patrol_plane_airframe_0`	—
$small_plane_airframe_0$ iw_small_airframe	2	1926	—	$small_plane_airframe_1$	Equipment: `small_plane_airframe_0`, `small_plane_cas_airframe_0`, `small_plane_naval_bomber_airframe_0`, `small_plane_suicide_airframe_0`, `cv_small_plane_airframe_0`, `cv_small_plane_cas_airframe_0`, `cv_small_plane_naval_bomber_airframe_0`, `cv_small_plane_suicide_airframe_0`	—
`Photo Reconnaissance` La Resistance photo_reconnaisance	1	1922	—	—	Modules: `recon_camera`	—
`Inter-War Transport Plane` bba_early_transport_plane	2	1933	—	Improved Transport Plane	Equipment: `transport_plane_equipment_1`	—
`Armor Piercing Bombs` armor_piercing_bombs	1	1936	Bombs	—	Modules: `armor_piercing_bomb_locks`	—
$medium_plane_airframe_0$ iw_medium_airframe	2	1926	—	$medium_plane_airframe_1$	Equipment: `medium_plane_airframe_0`, `medium_plane_fighter_airframe_0`, `medium_plane_scout_plane_airframe_0`	—
`Range Improvements` range_improvements	1	1936	Engines I	—	Modules: `fuel_tanks_small`, `fuel_tanks_medium`, `fuel_tanks_large`, `drop_tanks`	—
$large_plane_airframe_1$ basic_large_airframe	2	1936	$large_plane_airframe_0$	$large_plane_airframe_2$	Equipment: `large_plane_airframe_1`, `large_plane_maritime_patrol_plane_airframe_1`	—
$small_plane_airframe_1$ basic_small_airframe	2	1936	$small_plane_airframe_0$	$small_plane_airframe_2$	Equipment: `small_plane_airframe_1`, `small_plane_cas_airframe_1`, `small_plane_naval_bomber_airframe_1`, `small_plane_suicide_airframe_1`, `cv_small_plane_airframe_1`, `cv_small_plane_cas_airframe_1`, `cv_small_plane_naval_bomber_airframe_1`, `cv_small_plane_suicide_airframe_1`	—
`Engines II` engines_2 Has a scripted effect on completion.	1	1936	Engines I	Engines III	Modules: `engine_2_1x`, `engine_2_2x`, `engine_2_3x`, `engine_2_4x`, `engine_2_6x`	—
$medium_plane_airframe_1$ basic_medium_airframe	2	1936	$medium_plane_airframe_0$	$medium_plane_airframe_2$	Equipment: `medium_plane_airframe_1`, `medium_plane_fighter_airframe_1`, `medium_plane_scout_plane_airframe_1`	—
`Survivability Studies` survivability_studies	1	1939	Light MG	—	Modules: `self_sealing_fuel_tanks_small`, `self_sealing_fuel_tanks_medium`, `self_sealing_fuel_tanks_large`, `armor_plate_small`, `armor_plate_medium`, `armor_plate_large`	—
`Heavy MG` aa_hmg	1	1939	Light MG	—	Modules: `heavy_mg_2x`, `heavy_mg_4x`, `hmg_defense_turret`, `hmg_defense_turret_2x`	—
`Cannons I` aa_cannon_1	1	1939	Light MG	Large Cannons, Cannons II	Modules: `aircraft_cannon_1_1x`, `aircraft_cannon_1_2x`	—
`Improved Air Launched Torpedoes` air_torpedoe_2	1	1940	Air Launched Torpedoes	Advanced Air Launched Torpedoes	Modules: `torpedo_mounting_2`	—
`Engines III` engines_3 Has a scripted effect on completion.	1.5	1940	Engines II	Engines IV	Modules: `engine_3_1x`, `engine_3_2x`, `engine_3_3x`, `engine_3_4x`, `engine_3_6x`	—
`Heavy Bombs` heavy_bombs Has a scripted effect on completion.	1	1940	Bombs	—	Modules: `heavy_bomb_locks`	—
$large_plane_airframe_2$ Gotterdammerung improved_large_airframe Has a scripted effect on completion.	2	1940	$large_plane_airframe_1$	$large_plane_airframe_3$, Reinforced Mothership Wings	Equipment: `large_plane_airframe_2`, `large_plane_maritime_patrol_plane_airframe_2`	—
$small_plane_airframe_2$ improved_small_airframe Has a scripted effect on completion.	2	1940	$small_plane_airframe_1$	$small_plane_airframe_3$	Equipment: `small_plane_airframe_2`, `small_plane_cas_airframe_2`, `small_plane_naval_bomber_airframe_2`, `small_plane_suicide_airframe_2`, `cv_small_plane_airframe_2`, `cv_small_plane_cas_airframe_2`, `cv_small_plane_naval_bomber_airframe_2`, `cv_small_plane_suicide_airframe_2`	—
`Improved Transport Plane` bba_improved_transport_plane	2	1940	Inter-War Transport Plane	Modern Transport Plane	Equipment: `transport_plane_equipment_2`	—
$medium_plane_airframe_2$ improved_medium_airframe Has a scripted effect on completion.	2	1940	$medium_plane_airframe_1$	$medium_plane_airframe_3$	Equipment: `medium_plane_airframe_2`, `medium_plane_fighter_airframe_2`, `medium_plane_scout_plane_airframe_2`	—
`Large Cannons` aa_cannon_2	1.5	1943	Cannons I	—	Modules: `large_aircraft_cannon_1x`, `large_aircraft_cannon_2x`, `cannon_defense_turret`, `cannon_defense_turret_2x`	—
`Reinforced Mothership Wings` Gotterdammerung reinforced_wings_mothership	1.75	1942	Strategic Bomber II, $large_plane_airframe_2$	Miniature Fighters	—	`mothership`: Air Defence +0.08
$large_plane_airframe_3$ advanced_large_airframe	2	1944	$large_plane_airframe_2$	$large_plane_airframe_4$	Equipment: `large_plane_airframe_3`, `large_plane_maritime_patrol_plane_airframe_3`	—
$small_plane_airframe_3$ advanced_small_airframe Has a scripted effect on completion.	2	1944	$small_plane_airframe_2$	$small_plane_airframe_4$	Equipment: `small_plane_airframe_3`, `small_plane_cas_airframe_3`, `small_plane_naval_bomber_airframe_3`, `small_plane_suicide_airframe_3`, `cv_small_plane_airframe_3`, `cv_small_plane_cas_airframe_3`, `cv_small_plane_naval_bomber_airframe_3`, `cv_small_plane_suicide_airframe_3`	—
`Engines IV` engines_4	1.5	1944	Engines III	Centrifugal Jet	Modules: `engine_4_1x`, `engine_4_2x`, `engine_4_3x`, `engine_4_4x`, `engine_4_6x`	—
$medium_plane_airframe_3$ advanced_medium_airframe Has a scripted effect on completion.	2	1944	$medium_plane_airframe_2$	$medium_plane_airframe_4$	Equipment: `medium_plane_airframe_3`, `medium_plane_fighter_airframe_3`, `medium_plane_scout_plane_airframe_3`	—
`Advanced Air Launched Torpedoes` air_torpedoe_3	1	1944	Improved Air Launched Torpedoes	—	Modules: `torpedo_mounting_3`	—
`Miniature Fighters` miniature_fighters	1.5	1944	Reinforced Mothership Wings	Aerial Hangars	—	`mothership`: Air Agility +0.06 `mothership`: Air Attack +0.06 `mothership`: Fuel Consumption Factor -0.08
$large_plane_airframe_4$ modern_large_airframe	2	1945	$large_plane_airframe_3$	—	Equipment: `large_plane_airframe_4`, `large_plane_maritime_patrol_plane_airframe_4`	—
$small_plane_airframe_4$ modern_small_airframe	2	1945	$small_plane_airframe_3$	—	Equipment: `small_plane_airframe_4`, `small_plane_cas_airframe_4`, `small_plane_naval_bomber_airframe_4`, `small_plane_suicide_airframe_4`, `cv_small_plane_airframe_4`, `cv_small_plane_cas_airframe_4`, `cv_small_plane_naval_bomber_airframe_4`, `cv_small_plane_suicide_airframe_4`	—
`Centrifugal Jet` Gotterdammerung sp_centrifugal_jet_tech	2	1945	Jet Fighter I, Engines IV	—	—	`category_helicopter_support_companies`: Fuel Consumption -0.05 `category_helicopter_support_companies`: Maximum Speed +0.1 `category_helicopter_support_companies`: Defense +0.05 `category_helicopter_support_companies`: Breakthrough +0.05
`Modern Transport Plane` bba_strategic_airlifter	2	1945	Improved Transport Plane	—	Equipment: `transport_plane_equipment_3`	—
`Cannons II` aa_cannon_3	2	1945	Cannons I	—	Modules: `aircraft_cannon_2_1x`, `aircraft_cannon_2_2x`, `cannon_defense_turret`, `cannon_defense_turret_2x`	—
$medium_plane_airframe_4$ modern_medium_airframe	2	1945	$medium_plane_airframe_3$	—	Equipment: `medium_plane_airframe_4`, `medium_plane_fighter_airframe_4`, `medium_plane_scout_plane_airframe_4`	—
`Aerial Hangars` aerial_hangars	1.75	1946	Miniature Fighters	—	—	`mothership`: Air Agility +0.1 `mothership`: Air Range +0.2 `mothership`: Air Attack +0.1