Nevertheless, the fuel required is relatively easy to obtain, allowing players to collect rare space materials in preparation for the Hydrogen Engine. Petroleum engines using exclusively solid oxidizers ( Oxylite) are further limited to a 60000 km range with cargo. Although technically capable of reaching any destination on the starmap, they can only reach 110,000 km destinations with cargo bays and no solid fuel. In addition to the engine itself, they require Liquid Fuel Tanks and Solid or Liquid Oxidizer Tanks to function. Petroleum Engines are used in intermediate-level space exploration. However, they only require Steam, do not require separate fuel storage tanks, and have significantly cooler rocket exhausts. Without Solid Fuel Thrusters they are limited to a 10,000 km range, allowing access to only the closest destinations on the starmap. Steam Engines are the entry-level rocket engine that must be used to unlock the others. Note that solid fuel thrusters require their own gantry to provide access for supply errands. Solid Fuel Thrusters can be used in conjunction with engines to provide extra range. There are 3 engines in the game: Steam Engine, Petroleum Engine, and Hydrogen Engine. Building the rocket in space alleviates this problem, but meteors need to be considered. While there is no limit to the number of modules in a rocket, the range of a rocket is dependent on its mass, so unnecessary modules are ill-advised.Īs rockets typically produce a large amount of heat during take-off, building the rocket inside an insulated tower can help to prevent heat from leaching into other parts of the base. Players can safely deconstruct and replace modules in a rocket, but modules can only be built if connected vertically (possibly via other modules) to an engine. Rockets may optionally include other modules, such as Cargo Bays for carrying materials back from expeditions or Research Modules for Data Banks. The optimum ratio for engine performance, however, is 4.13-4.83:1, with nearly half the hydrogen uncombusted, but because hydrogen's density is so low, going with a higher oxidizer ratio yields savings in fuel tank volume, so the overall best performance for a hydrolox rocket is somewhere in the 5.5-6.0:1 range.Each rocket must have an engine at its base, a Command Capsule at the top, and a Gantry providing access to the command capsule. Since RP-1 kerosene is a blend of hydrocarbons, the stoichiometric ratio is difficult to calculate the optimum performance ratio is about 2.58-2.77:1 (ratios are normally given in form of oxidizer-mass-to-fuel-mass).įor hydrogen engines, the stoichiometric ratio is 8:1 - oxygen atoms are 16 times as massive as hydrogen atoms, and we're trying to combine two hydrogens with one oxygen to make H 2O. You wouldn't want to run oxidizer-rich, because the oxidizer that doesn't combust with fuel will react with the metal of the combustion chamber and nozzle. This produces the most thermal energy from combustion, but for a few different reasons, specific engines run at different ratios, most often on the fuel-rich side.Īs it happens, a very similar question came up a few days ago which explained some of this a fuel-rich combustion can produce better efficiency in spite of the lower thermal energy release. There is indeed a ratio of fuel to oxidizer that yields complete combustion, called the stoichiometric ratio.
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