Chemistry
Propellants & Fuels
Solid, storable, cryogenic, methane, kerosene, and hydrogen propellants — reactions, density, and the trade-offs that pick winners.
Propulsion research
Propulsion research
From the propellants flying today to electric thrusters, relativistic limits, and speculative warp concepts — propulsion explained with the physics kept honest.
Four guides
The propulsion hub spans four guides: propellant chemistry, electric propulsion, relativistic flight, and speculative warp drive. Each explains the real physics and is clear about what is proven versus open.
Propulsion, from chemistry to speculation.
Electric
Electric Rockets
Ion, Hall, and nuclear-electric propulsion: high specific impulse, low thrust, and where the physics actually pays off.
Physics reality check
Relativistic Flight
What relativistic travel really demands in energy and time — an honest look at the limits, not the hype.
Speculative
Warp Drive
Speculative faster-than-light concepts examined honestly against known physics and their enormous open problems.
From today to the far edge
Chemical, electric, and the honestly speculative.
This hub moves from the propellants flying today, through electric propulsion already working in space, out to relativistic and warp concepts — each treated with the same rule: explain the real physics, and flag what remains unsolved.
Specific impulse vs thrust
Chemical engines give high thrust and modest efficiency; electric thrusters invert the trade for deep-space cruise.
Energy budgets
Relativistic travel is bounded by energy, not engineering polish — the numbers set hard limits.
Honest speculation
Speculative concepts are presented with their open problems intact, never as solved technology.
Try the lab
See delta-v and burns in the Simulation Hub and combustion in the Propulsion Lab.
Related
See the engines that use these principles.
Propulsion theory meets hardware in the engine studies — from methalox staged combustion to cryogenic upper stages.