The Racer’s View

What if you sail with 7 crew instead of 8?

One checkbox. One number. A whole new edge map.

Green where lighter crew helps. Red where you need the weight. Across every wind condition — not a single-number guess, but a per-cell answer for every true wind angle and speed on the polar.

No Expert Mode One checkbox Whole-boat outcome

SailEdge Boat tab showing the Crew Weight feature section with checkbox and crew count input — Boat tab — Crew Weight section

Edge Map showing baseline comparison at ORC certificate crew weight (8 crew) — Baseline edge map — 8 crew (ORC certificate weight)

The Physics Behind the Delta

Not just a speed change — a stability story.

Sail with 7 instead of 8 and the edge map shifts: green in the reaching band where less displacement helps, red upwind where less righting moment costs you.

RM supplement tells you how much. Crew mode tells you why.

Edge Map with 7 crew showing green deltas on reaches and red deltas upwind — 7 crew (reduced) — green reaching, red upwind

TWA 30°–60°

Windward Rail

Crew on the rail, maximizing righting moment. Maximum RM supplement.

TWA 60°–120°

Blended

Smooth transition between rail and centerline. RM supplement scales with angle.

TWA 120°–180°

Centerline Low

Crew on the centerline at low position. Minimal RM effect.

For Sail Lofts

The sail wasn’t underperforming — the crew changed the balance.

Edge Map with 9 crew showing green deltas upwind in medium and heavy air — 9 crew (increased) — green upwind medium/heavy air

A customer sailed with 9 crew instead of the rated 8. The new sail didn’t deliver the expected edge downwind — but upwind, the map lit up green.

The extra crew weight added righting moment. Upwind in medium and heavy air, that means more stability, more drive, more speed. The sail wasn’t underperforming — the crew changed the balance.

Show them the RM supplement. Let the physics separate the sail’s contribution from the crew’s.

“Why didn’t the new sail make us faster downwind?”
Before crew weight explainability, that question led to warranty calls and expensive re-cuts. Now the RM supplement shows the answer: the sail is performing — the crew weight shifted the balance. Visible at Tier 1, no Expert Mode needed.

Crew weight explainability is visible to your customers — no Expert Mode required.

For Naval Architects

Per-cell RM supplement and crew mode across the full polar.

Smooth TWA transitions. Physically consistent RM scaling. Validation-grade resolution.

See the NA Workflow →

Your crew changes your edge.

What if you sail with 7 crew instead of 8?

Not just a speed change — a stability story.

The sail wasn’t underperforming — the crew changed the balance.

Per-cell RM supplement and crew mode across the full polar.

See what your crew changes.