Design sequence
Build the motor from chemistry through simulated firing.
Project Ember / Engineering analysis
Analyse an ABS and nitrous oxide hybrid motor through one traceable workflow: characterise combustion, define the grain, then resolve the complete firing.
Analysis sequence
Each saved result becomes an input to the next stage automatically.
Chemical equilibrium combustion properties for an ABS / oxidizer hybrid rocket motor.
Open toolDesign or upload a custom grain port shape (star, wagon wheel, or your own outline) and use it directly in the Hybrid Engine Transient Simulation.
Open toolTransient burn simulation (tank, injector, grain regression, nozzle) using the ABS equilibrium lookup table for combustion properties.
Open toolProcedure notes
Do the slow chemistry once, iterate on geometry, then tune the live burn.
Calculate flame temperature and exhaust composition across mixture ratios and chamber pressures, then save a reusable lookup table.
The chemical search is genuinely slow. Computing it once keeps the thousands of calls inside a burn simulation fast.Model a circular, star, wagon-wheel, or uploaded port and calculate how its flow area, burn surface, and fuel volume evolve.
Port shape controls the thrust profile: a circular bore usually rises through the burn, while a star can produce a flatter response.Resolve tank cooling, injector flow, fuel regression, chamber conditions, nozzle flow, thrust, and impulse moment by moment.
The run produces thrust, chamber pressure and temperature histories, total impulse, and downloadable burn data.Each tool records its output in the current workspace. A simulation uses the exact chemistry and geometry records you select; it never silently falls back to the newest.
A combustion table and a saved grain geometry are both required to run a simulation. The grain file supplies its own length, outer diameter, port shape, and quench margin.
Chemistry depends only on the propellants, geometry only on the grain, and the transient simulation is the part you re-run while tuning nozzle sizes and operating conditions. Separating those jobs keeps iteration fast and every input traceable.
0 chemistry run(s), 0 grain geometry file(s), and 0 burn simulation(s) are available in the current history.