Over-ballasted crank (rolls and skates)
Deliberately wrong. The ballast sits along the back, above the centre of buoyancy, so there is no righting couple. This is the bait every builder makes once.
What is this test design?
This is a deliberate failed crankbait build, not a lure recommendation. Moving its ballast onto the back removes the restoring couple the Tank needs to keep a lipped bait upright.
What the model actually measures
The grid uses 1 cm cells. The Tank computes displaced water, centre of mass, lip force, tracking stability and wobble at its default retrieve speed. It does not predict a running depth or a catch rate. See the equations and limits.
The medium diver with its lead moved to the top row and the hook hangers removed.
Tank verdict: Rolls over
It rolls over. The centre of mass sits at or above the centre of buoyancy, so there is no righting couple — this bait will lie on its side and skate.
- Length
- 80 mm
- Mass
- 15.3 g
- Buoyancy
- floating
- Stability
- -0.40
- Wobble
- 0.0 / 10
- Tempo
- 0.0
- Move ballast DOWN. Weight below the centreline is what keeps a bait upright.
- 1 rattle chamber: adds an acoustic signature the lateral line reads before the eyes do.
- No hook hangers. Also worth noting they hang low, so they double as keel weight.
Compare with the medium diver
Both designs run through the same Tank model at its default retrieve speed. These figures describe the block builds shown here, not commercial lures.
Scroll the table sideways to compare every measure →
| Model output | Top-heavy fail | Medium diver |
|---|---|---|
| Length 1 cm cells | 80 mm | 80 mm |
| Lip area number of cells | 2 | 2 |
| Buoyancy | floating | floating |
| Stability righting / overturning; N/A without lip force | -0.40 | 2.58 |
| Wobble model scale / 10 | 0.0 | 3.8 |
| Swim verdict | Fails | Swims |
Across 72 fish scenarios
Never eaten in any of the 72 scenarios. Outcomes: rolled over 72.
See any scenario page for the model's reason this one is refused, or open it in the Tank and fix it.
Other archetypes
A generic archetype drawn in Tank blocks, not a product, and the Tank works in one-centimetre cells rather than real dimensions. See how the Tank works and where it is wrong.