Research · Reference

Glossary

The terms SailrScience uses, each defined once, in the words the pages use — and, where a product site owns the term, in that site’s words.

Photography: Shutterstock 1160629495 (licensed).

One definition per term, in the same words everywhere. A term with a dotted underline links to its entry here. Each entry carries the short definition the pages use and points to the page that defines the term in full. Terms that belong to SailEdge™ by SailrScience or FleetEdge™ by SailrScience carry that product’s own words and link to its glossary.

The terms, defined once.

archetype
one of the fleet’s eight recurring design types
Other forms: archetypes, performance archetype, performance archetypes. Read the full definition on FleetEdge
calibration
the validated, saved boat-side profile that every sailmaker’s sail-side model builds on
Other forms: platform calibration. Read the full definition on SailEdge
cohort
the boats a figure is computed over — a real entry list, a class, a fleet — named on every figure
Other forms: cohorts. Read the full definition on FleetEdge
confidence grade
the grade every engine result carries for how far the evidence supports it — where the evidence cannot, the engine refuses and states why
Read the full definition
crew residual
what remains after the boat’s evaluated pace is accounted for — negative is faster, in s/nm
Other forms: crew-execution residual, crew performance residual. Read the full definition on FleetEdge
crossover chart
the chart of which sail wins at which wind speed and angle — the one skippers tape to the coaming
Other forms: crossover. Read the full definition on SailEdge
demo
the demo boats — open to everyone, no sign-in needed
Other forms: demo boats. Read the full definition on SailEdge
Digital Twin
the live performance model SailEdge builds from your ORC certificate — its certified dimensions, rig geometry and rated sail inventory
Other forms: Digital Twins. Read the full definition on SailEdge
Edge Map
the performance delta grid — every sail measured against your boat’s ORC polar at every wind speed and angle
Other forms: Edge Maps. Read the full definition on SailEdge
MPAE
the Multi-Dimensional Performance Archetype Engine — SailrScience’s classification system for offshore racing yachts
Other forms: Multi-Dimensional Performance Archetype Engine. Read the full definition
Optimal Map
the crossover chart computed from your ORC certificate — the sail your boat can actually hold at every wind speed and angle
Read the full definition on SailEdge
physics evaluation
one full aero and hydro force-balance solve at one point of the wind envelope
Other forms: physics evaluations. Read the full definition on SailEdge
PPI
the Performance Potential Index
Other forms: Performance Potential Index. Read the full definition on FleetEdge
Regime Affinity
how favorably a boat suits a defined wind regime
Other forms: wind-regime affinity. Read the full definition on FleetEdge
sailing state
the balance a stability result describes — natural, after modeled depower, or after a modeled sail change from the rated inventory
Other forms: sailing states, reference sailing state. Read the full definition on SailEdge
stability
how much righting moment the boat carries relative to its displacement
Other forms: platform stability. Read the full definition on FleetEdge