Product

A native Windows and Mac workbench for preliminary pressure-fed liquid engine design.

One engine case carries performance calculations, thermochemistry, injector and feed-system sizing, nozzle geometry, flowfield inspection, test-data correlation, and every export. This page walks through that sequence as it appears in the application.

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Native macOS interface with engine case inputs and solved summary values — Native desktop interface for pressure-fed engine sizing and case review (shown on the signed Mac 1.0.0 release; Windows shares the application workflows and is currently an unsigned 1.0.0 public beta).

The design sequence

Define the operating point. Propellants, chamber pressure, mixture ratio, expansion ratio, ambient condition, and one sizing target: vacuum thrust, total mass flow, throat diameter, injector geometry, or tank pressure.
Solve the engine. First-pass or coupled steady-state. Outputs include characteristic velocity, chamber temperature, vacuum and ambient Isp, mass flow, expansion behavior, and separation-screening flags. Embedded CEA-referenced tables are the default thermochemistry; a local RocketCEA install is an optional backend, and any fallback or estimate is labeled in the results.
Size feed and injector components. Feed-system pressure budget plus unlike doublets, triplets, and showerhead elements: per-stream orifice sizing, injector pressure drop, momentum ratio, packing and ligament checks, and O/F consistency warnings.
Generate nozzle geometry. Bell, conical, and TIC contours with solved throat, exit, length, and area ratio, then DXF export of the contour for CAD or machining reference.
Inspect flowfield results. Preliminary axisymmetric, nonreacting nozzle and plume cases in Flowfield Studio, with residual status and transient playback.
Compare test data. Reduce measured hot-fire records to effective c*, Cf, discharge coefficients, O/F, and Isp with residuals, and calibrate the design model against your own test data.
Export and document. PDF report, CSV/JSON data, DXF geometry, VTK fields, and PNG/MP4 media, all from the same solved case.

Outputs

A solved case exports a PDF report with the assumptions and warnings visible, the DXF nozzle contour, CSV/JSON data, VTK flowfield fields, and PNG or MP4 media. Projects save locally and reopen with their full solve context.

High-contrast rendering of the application-exported Apollo LMAE reference nozzle DXF contour — LMAE reference-case nozzle contour, exactly as exported to DXF.

Engine sizing summary report with solved values, assumptions, and warnings — Engine sizing summary report: solved values, assumptions, and warnings.

Availability by license

Every paid option includes engine sizing, injector and feed-system tools, nozzle geometry, DXF export, PDF/CSV/JSON reports, and Flowfield Studio (steady-state and transient simulation, playback, and VTK export). Personal Monthly is noncommercial and supports Flowfield meshes up to 250,000 cells; Personal Annual is noncommercial with no plan-tier Flowfield mesh cap; Business adds commercial-use rights. See pricing.

Runtime

Application: Native C++/Qt desktop app: unsigned Windows 11 (64-bit) public beta 1.0.0 and signed/notarized Apple silicon Mac release 1.0.0. Local files, local computation; no cloud requirement and no browser-held engineering state.
Acceleration: Flowfield Studio uses Apple GPU/Metal acceleration where the installed build and solver path support it.
External tools: Optional integrations such as RocketCEA run as local installs configured by the user.
Boundary: Preliminary design software. Results should be reviewed by qualified engineers and validated against test data before hardware decisions.

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