What keeps the hull afloat?
How requested mass changes the level hull’s immersion in still water—and what this calculation cannot tell us.
Read development noteSYSTEM / 01
Shape. Balance. Behaviour.
Hull & Hydrodynamics — understanding the surface beneath the ride.
The real surface,
up close.
The engineering geometry remains the reference. Investigate the rocker, channels and shaped stern without replacing the design with an invented model.
Inspect the hull viewsH0 / R02 / GEOMETRIC STUDY
The shape, section by section.
Four slices through the actual sampled hull surface. The same axis scale makes their proportions directly comparable.
0% = stern; 100% = bow. Y is port-positive; Z is up. All valid source samples are retained. These are geometric sections, not CFD or physical-test results.
Read the surface investigationHow load changes immersion.
A level hull settles deeper as the requested mass increases.
Level-attitude displacement
● Seawater · 1,025 kg/m³○ Freshwater · 998 kg/m³
40 kg → 0.0705 m level immersion in seawater.
H0 R03 · source samples connected, no extrapolation. 100 kg is unachievable in both source series and is not plotted. No uncertainty band supplied.
View the numerical data
| Mass (kg) | Freshwater immersion (m) | Seawater immersion (m) |
|---|---|---|
| 5 | 0.01336 | 0.01301 |
| 10 | 0.02514 | 0.02458 |
| 15 | 0.03473 | 0.03403 |
| 18.2 | 0.04014 | 0.03935 |
| 20 | 0.04305 | 0.04221 |
| 22 | 0.04619 | 0.04529 |
| 25 | 0.05074 | 0.04976 |
| 30 | 0.05802 | 0.05689 |
| 40 | 0.07190 | 0.07045 |
| 50 | 0.08567 | 0.08386 |
| 60 | 0.09952 | 0.09732 |
| 80 | 0.13774 | 0.13185 |
| 100 | Unachievable | Unachievable |
Behind the numbers.
Reading the hull surface
Sections, fairness and feature intent provide a record of the geometry investigation.
Read development noteFirst, establish the reference.
A consistent coordinate system makes later measurements easier to compare.
Read development noteTrace the study history.
ARCHIVE
The original idea
Sketches and earlier board concepts.
Open recordH0 / R01
Establish the reference
Coordinates and reference checks.
Open recordH0 / R02
Examine the surface
Sections, fairness and feature intent.
Open recordH0 / R03
Study flotation & balance
The sealed-envelope displacement study.
Open record