DriftSim

Where does it land if it doesn't deploy?

Results

Run a simulation to see landing statistics.

Flight & rocket

Apogee (ft AGL) Mass (lb)

Diameter (in) Ballistic attitude drag for a no-deploy fall

Descent mode

Ballistic — no deploy (lawn dart) Single event (drogue or main only) Dual deploy (drogue then main) Ballistic rate (ft/s) auto-computed from mass, diameter & attitude — editable

Drogue rate (ft/s) Main rate (ft/s)

Main deploy altitude (ft AGL)

Launch attitude

Rod tilt (° off vertical) how far the rail leans from vertical Rod azimuth (°) dir it leans (0=N, 90=E, 270=W)

Weathercock — apogee shift upwind (ft per mph of wind) how hard it weathervanes into the wind on boost; 0 = none

Winds aloft

Date Hour (local)

Wind profile top (ft AGL)

Speed in mph. "From" = the compass direction the wind blows from (W = out of the west, pushing rockets east).

Alt (ft AGL)	Speed (mph)	From

Dispersion (Monte Carlo)

These are not extra inputs. Each simulated flight randomly varies from your settings above (including the wind table) by these amounts. σ = standard deviation. Set a σ to 0 to hold that value fixed. The wind table is always the base.

Number of simulated flights more = smoother scatter, a bit slower

Apogee σ (%) motor & mass spread Descent rate σ (%) chute/tumble inconsistency

Tilt σ (°) rail-angle wobble shot to shot Azimuth σ (°) aim & wind-shift spread

Weathercock σ (%) some rockets cock more than others

Wind speed σ (% of table) gusts & forecast error Wind dir σ (° off table) wind shifts & forecast error

Launch site

Coordinates (DMS or decimal)

Tip: click the map to move the launch site.

Landing zones

Green = OK to land · yellow = shouldn't · red = must never. Anything outside the OK field is not acceptable.

+ Add a zone

Name Type Boundary coordinates — one "lat, lon" per line