⚓ Boat Stability Simulator
350 × 150 × 60 mm · Hull 200 g · 2D Cross-Section Physics
Flat Bottom
Round Bottom
V-Hull
Multi-Hull
✏ Custom
⚓ Simulate
✏ Design Hull
Heel Angle
Heel angle
0.0°
Slider Weight
Mass
200 g
Horizontal position
0 mm
Vertical position
30 mm
Stability Readout
Righting Arm GZ
—
mm
Rest. Moment
—
N·m
GM (upright design)
—
mm
BM (upright)
—
mm
Buoyancy Force
—
N (= weight of water displaced)
Calculating…
Legend
Centre of Buoyancy (CoB)
Centre of Mass (CoM)
Metacentre (M)
Slider weight
Buoyancy force ↑
Weight ↓
Waterline
How It Works
Boat rotates about its
Centre of Mass
.
Waterline rises until displaced water = boat weight (Archimedes).
BM = I / V
— wide hulls have large I → M sits high.
GM = KB + BM − KG.
Positive = stable.
Hull Designer
Draw the
right half
of your hull cross-section.
•
Click
to place a point
•
Drag
any point to adjust
•
Snaps
to 5mm grid
• Hull is
mirrored
automatically
Grid = 75mm wide × 60mm tall
Mirror line = left edge
Tool
〰 Curve
／ Line
●
Curve point — smooth spline segment
■
Line point — straight segment
Points placed
0
Cursor position
— mm
↩ Undo Last Point
✕ Reset
▶ Test in Simulator
Need at least 3 points to simulate. First point = keel bottom, last = deck edge. Each new point uses whichever tool is currently selected.