Loft
Import an OpenRocket design and simulate the flight in your browser — apogee, Mach, stability, and drift, checked against OpenRocket's own numbers.
Loft simulates a high-power rocket flight from an OpenRocket .ork design, entirely in your browser. Import a file and it reads the component tree, materials, motor mounts, and recovery, then flies it with a standard-atmosphere model, Barrowman stability, a component-buildup drag model, real motor thrust curves resolved from a bundled ThrustCurve database, and a Runge–Kutta integrator — returning apogee, max velocity and Mach, rail-exit and burnout speed, descent rate and drift, dynamic pressure, and the timings, with plots and a phase-coloured flight path.
It measures its own accuracy rather than assuming it: Loft re-flies your design under the launch conditions OpenRocket stored in the file and diffs each metric, so the agreement is shown, not claimed. It can also re-fly for today's weather from live winds aloft, warns when a flight runs outside the drag model's validated envelope, and links every calculation to its source in a candid limitations log. Every figure is an estimate from a model, not a measurement, and never a go/no-go verdict — the motor's printed data and your RSO are authoritative.
What it does
OpenRocket import
Reads .ork files (gzip-wrapped or raw XML) — component tree, materials, motor mounts, recovery, and stored results — degrading gracefully on anything unrecognised.
Full flight simulation
A standard atmosphere, Barrowman stability, a component-buildup drag model, real thrust curves, and a Runge–Kutta integrator with 6-DOF-shaped state.
The numbers that matter
Apogee, max velocity/Mach/acceleration, rail-exit and burnout velocity, descent rate and drift, dynamic pressure, and timings — metric or imperial.
Checked against OpenRocket
Flies your design under its own stored launch conditions and diffs each metric, so the accuracy is measured and shown, not assumed.
Resolves real thrust curves
A .ork names a motor but embeds no curve — Loft resolves it against a bundled offline ThrustCurve database, and flags an approximate or missing match.
Today's weather
Optionally pulls live surface conditions and winds aloft for a launch site to see how density and wind change apogee and drift.
Warns on extrapolation
Marginal stability, low rail-exit speed, and transonic flight outside the drag model's envelope are flagged — without ever issuing a verdict.
Shows its work
Every calculation links to its published source, with a candid limitations log and validation section — the math is meant to be checked, not trusted.
Try it out
Free to use, no account required.