Tech Tree

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The Tech Tree is used to unlock new parts for building vessels. The tech tree has a branching structure made up of nodes, each containing a collection of one or more parts. Nodes are unlocked by spending Science points to research their listed technologies. These nodes are spread out across multiple tiers which generally divide the parts by their ability to facilitate further exploration and build more complex crafts. The tree starts with the initial Starting Rocketry node already unlocked. Subsequent nodes all have a prerequisite node which must be unlocked before itself. The entire tech tree requires 152,080 Science points to unlock.

The tech tree is accessible via the KSC R&D Center and is therefore only available in Exploration Mode.

Use

The tech tree is displayed a horizontal branching structure going from left to right. The player can use Science points earned by completing Missions and conducting experiments to unlock the nodes on the tech tree. Green nodes are already unlocked, bright gray nodes with a blue Science points icon are available to be researched, and dark gray nodes are not yet accessible. Once a node is unlocked, it's subsequent node or nodes become available to unlock. Clicking on any node provides a description of it's technology, list of parts included, cost in Science points, and the option to research the node if not already researched.

Nodes are arranged into rows and columns which indicate their cost in Science points. Nodes in any particular column generally cost the same amount of Science points, with some exceptions, and the cost increases as you move from left to right along a row. Branches along the tree broadly follow certain themes, such as propulsion, utility, construction, or aerodynamics. Each tier following Tier 1 is made accessible by unlocking all of the top level nodes. For example, once Power Launchers is unlocked in Tier 1, Tier 2 becomes available starting with Medium Orbital Rockets.

Tier 1

The first tier of the tech tree requires 1,010 Science points to fully unlock. This tier is generally aimed at navigating Kerbin and its moons.

Name Cost Required Nodes(s) Parts List
Starting Rocketry 0 None
Light Launchers 10 Starting Rocketry
Solid Fuel Boosters 15 Light Launchers
Orbital Rocketry 25 Solid Fuel Boosters
Mun Landing 80 Orbital Rocketry
Power Launchers 180 Mun Landing
Environmental Science 10 Light Launchers
Struts 35 Solid Fuel Boosters
Reaction Control System 50 Orbital Rocketry
Monopropellant Drive 80 Reaction Control System
Tiny Engines 120 Monopropellant Drive
Probes 10 Light Launchers
Lights & Utilities 15 Probes
Power Management 35 Lights & Utilities
Long-Range Probes 50 Power Management
Small Payloads 35 Introductory Construction
Research Miniaturization 50 Power Management
Introductory Construction 10 Light Launchers
Specialized Decoupling 15 Introductory Construction
Basic Docking 50 Specialized Decoupling
Basic Trusses 25 Introductory Construction
Micro-Construction 35 Basic Trusses
Aerodynamics & Stability 10 Light Launchers
Survivability 10 Aerodynamics & Stability
Light Aviation 50 Survivability

Tier 2

The second tier of the tech tree requires 11,170 Science points to fully unlock. This tier introduces parts typically used for initial interplanetary travel, particularly Nuclear Propulsion.

Name Cost Required Node(s) Parts List
Medium Orbital Rockets 180 Power Launchers
Medium Launchers 400 Medium Orbital Rockets
Nuclear Propulsion 650 Medium Launchers
Modular Launchers 300 Nuclear Propulsion
Fuel Lines 300 Medium Orbital Rockets
Precision Propulsion 400 Fuel Lines
Xenon Propulsion 850 Nuclear Propulsion
Enhanced Electronics 230 Medium Orbital Rockets
Durable Power Systems 300 Enhanced Electronics
Rovers 400 Durable Power Systems
Autonomous Sampling 500 Rovers
Atmospheric Science 300 Enhanced Electronics
Landing Utilities 400 Precision Machining
Heavy Landings 500 Landing Utilities
Expanded Construction 230 Medium Orbital Rockets
Precision Machining 300 Expanded Construction
Medium Payloads 400 Precision Machining
Medium Trusses 500 Medium Payloads
Medium Truss Adapters 650 Medium Trusses
Enhanced Coupling 300 Expanded Construction
Tiny & Large Docking 400 Enhanced Coupling
Precision Aerodynamics 230 Medium Orbital Rockets
Mk2 Jets 300 Precision Aerodynamics
High-Altitude Aviation 400 Mk2 Jets
Aviation Utility 500 High-Altitude Aviation
Aerial Drones 400 Mk2 Jets

Tier 3

The third tier of the tech tree requires 42,900 Science points to fully unlock. This tier introduces parts typically used for deep space interplanetary travel.

Name Cost Required Node(s) Parts List
Heavy Rocketry 1400 Modular Launchers
Heavy Launchers 1800 Heavy Rocketry
Deep Space Methalox 2900 Heavy Launchers
Heavy Nuclear Propulsion 4500 Deep Space Propulsion
Oversized Monopropellant Fuel 1800 Heavy Rocketry
Heavy Orbital Operations 2300 Heavy Launchers
Deep Space Probes 1400 Heavy Rocketry
Enlarged Power Systems 1800 Deep-Space Probes
Long-Range Generation 2300 Enhanced Power Systems
Nuclear Power 2900 Long-Range Generation
Radiation Science 1800 Deep-Space Probes
Orbital Science 2900 Radiation Science
Heavy Construction 1400 Heavy Rocketry
Heavy Trusses 1800 Heavy Construction
Large Payloads 2300 Heavy Trusses
Large Coupling 1800 Heavy Construction
Specialized Docking 2300 Large Coupling
Large Aerodynamics 1400 Heavy Rocketry
Jumbo Jets 1800 Large Aerodynamics
Airliners 2300 Jumbo Jets

Tier 4

The fourth tier of the tech tree requires 97,000 Science points to fully unlock. This tier introduces parts for XL sized crafts. Colony parts are expected to first become available in this tier once released. The large yellow star seen in the background of Tier 4 is thought to potentially be Deb Deb, hinting at interstellar travel.

Name Cost Required Node(s) Parts List
XL Methalox Tanks 5000 Heavy Nuclear Propulsion
XL Hydrogen Tanks 6000 XL Methalox Tanks
XL Electronics 5000 XL Methalox Tanks
Aquatic Sciences 6000 XL Electronics
Orbital Report 7000 Aquatic Sciences
Oversized Landing 5000 XL Methalox Tanks
Space Truckin' 7000 XL Trusses
XL Construction 5000 XL Methalox Tanks
XL Trusses 6000 XL Construction
XL Truss Adapters 7000 XL Trusses
XL Payloads 8000 XL Truss Adapters
XL Coupling 6000 XL Construction
XL Docking 7000 XL Coupling
Space Shuttles 6000 Spaceplanes
Spaceplanes 5000 XL Methalox Tanks
Mk3 Fuel Systems 6000 Spaceplanes

Tier 5

The fifth tier of the tech tree was expected to be made available with the release of the Colonies milestone update and was said to contain colony parts.

Tier 6 & Beyond

The sixth tier of the tech tree was "planned". Considering the number of colony parts alleged to be introduced as well as parts necessary for interstellar travel, tiers could have continued past 6 depending on the number of nodes to be added to Tiers 4 - 6 and the number parts per node.

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