Spacecraft engineering calculators

Describe a mission and ENKI designs it with you conversationally, running the calculators below as tools and tracking a live mission design state.

Solar array, battery, and power-system mass sizing for typical LEO missions, with a side-by-side beamed-power trade.

Antenna sizing, beam density, free-space path loss, and end-to-end efficiency for a Ka-band microwave power transmission link.

Days-to-reentry from atmospheric drag at LEO altitudes. Three solar-activity tiers, ballistic-coefficient scaling, altitude-vs-time chart.

Motional EMF, circuit current, generated power, and the J×B drag back-reaction for a conductive tether in LEO.

Delta-v and propellant for a Hohmann transfer, plane change, combined maneuver, circularization, or deorbit — with a per-burn breakdown.

Propellant mass, tank volume, and burn time from a delta-v requirement and propellant choice — Tsiolkovsky rocket equation.

LEO disturbance torques — gravity-gradient, aerodynamic, solar-pressure, magnetic — and reaction-wheel and magnetorquer sizing.

Hot- and cold-case equilibrium temperature from absorbed solar, albedo, Earth-IR and internal heat versus radiated heat, plus radiator sizing.

Beta angle and eclipse fraction across a year, accounting for J2 nodal regression and the Sun moving along the ecliptic.

Subsystem mass roll-up with maturity-based contingency margins, checked against a launch-mass cap.

Data generation versus ground-station downlink capacity versus onboard storage — daily balance, fill time, break-even analysis.

Per-operating-mode power draw and the orbit energy balance, with eclipse depth-of-discharge against the battery limit.