Molecule Mechanics(Methane)
This is the simplest alkane, consisting of one carbon atom and four hydrogen atoms, utilized by Starship.
Methane(CH4)
This is the classification of chemical reactions, like methane combustion, that violently release thermal energy.
Unlike RP-1 kerosene, methane leaves none of this carbon-heavy buildup behind, which heavily supports rapid booster reuse.
Soot
This acronym describes utilizing the natural raw materials found on Mars to engineer rocket fuel on site.
ISRU (In-Site Resource Utilization)
Based on the tetrahedral geometry of a methane molecule, this is its specific bond angle.
109.5 Degrees
In a balanced chemical equation for the combustion of methane, these two molecules are formed as products alongside energy.
CO2 and H2O
Liquid methane sits in a operational "sweet spot" because its fuel density value is approximately this many kilograms per liter.
0.42 kg/L
This chemical process will be used on Mars to initially split harvested water ice into separate hydrogen and oxygen atoms.
Electrolysis
Methane gas liquefies and becomes manageable for cryogenic rocket storage at this specific boiling point.
-162 Celcius (111K)
This is the enthalpy value associated with burning exactly one mole of methane in the Raptor engine.
802 Kj/mol
While liquid hydrogen has the highest efficiency, its very low density creates the manufacturing downside of requiring these.
Huge Propellant Tanks
This specific chemical reaction combines Martian carbon dioxide with hydrogen gas to synthesize methane for the return trip.
Sabatier Reaction
This structural parameter represents the distance between the carbon and hydrogen nuclei in a methane molecule.
108.7pm
The Raptor engine achieved a record-breaking internal chamber pressure exceeding this value.
300atm
Liquid methane and liquid oxygen can share a single cooling system because they possess highly similar ranges for these properties.
Melting and Boiling points
o synthesize methane on Mars, the atmospheric gases and hydrogen must be heated between 573K and 673K in the presence of this metal catalyst.
Nichel (Ni)
Compared to traditional dense fuels like kerosene, methane exhaust products yield a higher specific impulse due to this molecular trait.
Low molecular weight
The Raptor engine is unique because it is the first flyable engine to cycle propellants into extraordinary high-pressure gases using this specific mechanism.
Full-flow cycle
This metric, measuring rocket propellant efficiency in seconds, sits at approximately 380s for Starship's methalox system.
Specific Impulse
According to the Sabatier chemical equation (CO2 + 4H2 --> CH4 + 2H2O), this is the exact molar ratio of hydrogen molecules required per single molecule of carbon dioxide.
4 to 1