Impulse drive is based on the principle of impact, and heating of matter is carried out during a nuclear reaction. With each level of the impulse drive developed, the speed of Small Cargo (after 5th level), Bomber (until Hyperspace Drive is developed to level 8), Stealth Fighter, Cruiser, Science Vessel, Colony Ship, Metal Harvester, Mineral Harvester and Gas Harvester is increased by 6% of the base value. Each level of technology increases maximum flight distance for the Interplanetary Missiles.