Engineering

Sailing across the wind

Adjust the sheet and rudder while apparent wind, sail pressure and the keel combine to move a sailboat.

Actual application image

Try this

Change the wind direction and sheet angle. Compare apparent-wind propulsion with the keel resistance, then steer with the rudder.

The model and its limits

Planar flat-sail pressure model with lateral keel resistance. The scene follows the boat. No validated yacht polars, heeling or sea-state simulation.

Equations used in the module

Equations
F_n = 0.5 rho A C_n v_n |v_n|
m dv/dt = F_sail + F_keel + F_drag

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Funicular: two cars balance a mountainside

Compare passenger loads and watch the shared cable, traction motor and regenerative braking move two cars along an incline.

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