There’s more to a turn than getting around.
How much speed did you hold? Did you give away ground? How long until you were sailing well again? Foil Run follows your approach, turn, and recovery to answer each question.
How much speed did you hold?
You approached at 11.6 knots. Your slowest sustained stretch near the turn averaged 7.6 knots. That’s 66% speed held. The turn took a bite out of your speed; this number tells you how much remained.
Tacks and gybes use the same measurement. The slowest stretch can fall before, during, or after the detected turn. Check its timing to see where you lost speed. Above 100% is possible.
How we choose the two speed windows
Foil Run marks the midpoint of the accepted turn core and searches eight observed seconds on either side. It selects the slowest continuous, time-weighted stretch containing at least three observed seconds.
The approach is a separate 10-observed-second average, ending four observed seconds before the earlier of the detected maneuver or search area. Speed held is the slowest-stretch speed divided by that approach speed. Observed seconds count usable recording time; gaps add none. These windows are Foil Run’s measurement convention. A slowest stretch touching a search edge is flagged for a closer look, rather than discarded.
Where the slowdown sits
Before the turn
During the turn
After the turn · this example
Going backward and falling behind are different things.
FULL GROUND LOST
“How much ground did I miss out on while turning and recovering?”
The solid line follows the recorded ride toward the wind. The dashed line estimates the progress at steady sailing pace before and after the maneuver. The gap between them is the estimated full ground lost.
On the row: To full recovery is the recorded clock from departure until speed and pointing are both back. Full ground lost is the settled-pace gap over that whole interval. A favorable signed result reads “no measurable loss.”
Session Overview uses clean tacks and gybes for these summaries. A climb summary includes all recovery outcomes for Speed held, and clean maneuvers for Full ground lost. Individual rows show full-recovery time and cost only for a clean maneuver within a climb. Touchdown and crash details show Off foil instead of speed held. It estimates time spent off foil from observed motion below 4 knots. Brief faster attempts and missing GPS time are excluded; it is not the full clock until speed and pointing recover. Incomplete recovery evidence is marked.
Port or starboard refers to the side you approached from: from port or from starboard. Foil Run uses the steady stretch before the turn to assign the side.
Foil Run assesses recovery after each detected maneuver: clean, touchdown, crash, or unknown. Your clean-landing rate is the share of known outcomes marked clean. Six clean landings, two touchdowns, and two crashes gives you 60%. Turns marked unknown stay out of the calculation.
Check your own maneuvers.
Open a climb in Analyze to inspect its turns. For the pace of the whole climb, read the VMG guide.