Pensacola · 2026-11-07

• Leo's cant out on the old board: keep it, because the boat comes out flatter. Start it by -3 s, then test it head to head, because it isn't faster yet. In the last 12 minutes (Liv driving from 11:28, then Race Team 11:34-11:40) the old board was canted out from about -5 s, 4-10 deg more by its up button. Across every clean tack at 16-21.5 km/h those 8 came out flatter: peak heel onto the new leeward side 2.7 deg against 6.4 for the 44 others. The outside hull peaked no lower (1,350 against 1,381 mm). The boat stayed flat because the inside hull stayed up. The lowest speed (32.1 against 32.4 km/h) and VMG through (20.5 against 20.8) didn't change, and 3 of the 8 put the inside hull under 130 mm. The one that started late, 11:38:47, touched down.
• Race Team's best tacks went in high and fast and came out high. Its 5 best went in at 42 deg and 52.3 km/h, came out at 49 deg, had the old board up at +1.9 s and both boards down for 5.6 s. The other 13 clean tacks went in at 50.5 deg and 50.3 km/h and came out at 59 deg, with the board up at +2.5 s and 6.8 s on two boards. The lowest speed was the same (35.3 against 35.7 km/h), but the best made 26.7 km/h through against 24.1. Steer in from close-hauled, finish the turn at an upwind angle, and get the old board up by +2 s.
• Port to Stbd is where the boat heels, and Stbd to Port is where it touches down. It's the starboard hull both times. On Race Team's clean tacks the starboard hull rose 265 mm Port to Stbd and peaked at 1,411 mm, against 165 mm and 1,304 for the port hull the other way, and the boat heeled 6.6 deg onto the new side against 2.9. On Port to Stbd the old board also went up later (+2.8 against +2.2 s). Coming out of Stbd to Port, 6 of the day's 9 touchdowns happened: 22 % of those tacks against 7 %. Race Team's three were all the starboard hull going in 4-10 s after the turn.
• Upwind, Race Team sailed higher than every Sassnitz boat. It paid at 17.5-20 km/h and cost at 20-22.5: sail 1-2 deg lower for speed in the top of the breeze. At 17.5-20 it sailed 44.7 deg at 47.6 km/h (average of the two tacks, 27 periods), against 46.1 deg at 48.3 for NZL (Sassnitz), 46.9 at 48.9 for AUS (Sassnitz) and 49.3 at 50.9 for FRA (Sassnitz), the best upwind. The VMG that resulted, 35.1 km/h, was 1.2-2.3 above theirs. At 20-22.5 FRA (Sassnitz) sailed 1.3 deg lower and 5 km/h faster, for 37.4 km/h of VMG against Race Team's 34.9.
• Development with Jake on flight control flew least steadily of anyone, and at 17.5-20 it sailed low without the speed. Ride-height deviation upwind was 104-108 mm at 15-20 km/h, against 59-89 for every other team and every Sassnitz boat. At 17.5-20 it sailed 52.0 deg at 48.7 km/h, 3-6 deg lower than the Sassnitz boats for no more speed, and made 31.2 km/h of VMG against 32.8-33.9.
• Liv driving: the angle is right, so find the speed. At 15-17.5 km/h Liv sailed 50.8 deg, between NZL (Sassnitz) and FRA (Sassnitz), at 45.1 km/h against their 47.6-49.4, for 29.3 km/h of VMG against 31.0-31.5 (25 periods).
• Downwind, Race Team was the best boat at 20-22.5 and 4 deg too high at 17.5-20. At 20-22.5 it sailed 145.7 deg at 63.1 km/h, 5 deg deeper than FRA (Sassnitz) at the same speed, for 51.9 km/h of VMG against 50.4. At 17.5-20 it sailed 135.9 deg at 61.0 km/h, 4 deg higher than FRA and AUS (Sassnitz), for 44.2 km/h of VMG against FRA (Sassnitz)'s 46.6; AUS (Sassnitz) made 43.7 at 4 km/h less speed. Development was 7 deg higher again (133.1 deg, 40.6 km/h of VMG). Sail deeper at 17.5-20.

Read these before trusting a gap.

• B15's wind sensor reads differently on each tack. In the same few minutes, port tack read about 2 km/h less wind than starboard upwind and 3 km/h less downwind, and TWA 6 deg higher upwind. On 6 Nov the wind split was under 1.5 km/h, and the Sassnitz boats read within 0-1 km/h. A team that sailed mostly on port therefore lands in a lower band and looks quicker. The figures above are the average of the two tacks wherever a team had 3 periods on each; the tables are as built. All of Development's upwind periods at 17.5-20 were on port, so they aren't judged. Get the wind sensor checked before the next day (Deep dives).
• Clear air: our teams sailed alone. Sassnitz had 13 boats, six fleet races (NZL in three) and practice. Level numbers are encouraging, but they don't prove anything in traffic.
• How the numbers are built: each team's figures are the average of its own better sailing, at or above 95 % of its own median VMG, with periods trading speed for angle left out. They don't show how often a team gets there.
• A turn counts if it holds enough of the crew's own straight-line VMG. A tack counts when its VMG through is at least 65 % of that crew's straight-line VMG in the same wind, and a gybe at 70 %. That kept 15 of Race Team's 29 tacks, 5 of Development's 9, 9 of Jake FC's 12 and 13 of Liv's 15, and about two-thirds of the Sassnitz boats' turns. Liv's are judged against Liv's own straight line, the slowest of the four, so more of them pass. This replaced Filter Score 70, which ranked a boat's turns against each other. That kept about a third whatever the quality and ranked the crews sharing B15 against each other: it passed 1 of Liv's 15 tacks. The deep dives use every tack.
• The first 34 minutes come from the downloaded file. It matches the database to within 0.2 s on 62 channels. It has no button, twist-input, camber-input or cant-command channels, so before 09:42 the board marks are the stow states, which lag the button by 0.1-1.2 s, and those settings are blank.
• BRA is left out of every comparison. GER (Sassnitz) is the best tacker shown and ESP (Sassnitz) the best gybing boat.

• 09:24:08 (15:24:08 UTC) Race Team, Port to Stbd: the best tack of the day, 28.4 km/h through it, in at 52.3 km/h from 40 deg
• 09:20:10 (15:20:10 UTC) Race Team, Port to Stbd: a good tack (25.9 km/h through) with the starboard hull up to 1,772 mm, the highest of Race Team's day
• 09:30:09 (15:30:09 UTC) Race Team, Stbd to Port: touchdown 11 s after the previous tack, down to 20 km/h
• 10:25:27 (16:25:27 UTC) Race Team, Stbd to Port: touchdown, the starboard hull to 43 mm and 23 km/h, then a bear-away
• 11:28:49 (17:28:49 UTC) Liv driving: the first cant-out tack, 1.0 deg of heel and neither hull below 886 mm
• 11:34:26 (17:34:26 UTC) Race Team, Stbd to Port: cant out to -9.8 deg and only 2.4 deg of heel, but the starboard hull came down to 126 mm at +4 s
• 11:38:47 (17:38:47 UTC) Race Team, Stbd to Port: the cant came late (from -0.4 s) and only to +1.5 deg; 6.9 deg of heel, then a touchdown at 26 km/h
• 11:39:52 (17:39:52 UTC) Race Team, Port to Stbd: cant all the way out (-8.5 deg at the raise): 2.9 deg of heel, 37.5 km/h at the lowest, 860 mm lowest hull
• 09:46:28 (15:46:28 UTC) Development's best tack: 25.2 km/h through, 39.0 km/h at the lowest
• 10:57:01 (16:57:01 UTC) Development with Jake on flight control, Port to Stbd: the starboard hull up to 2,062 mm, then a touchdown
• 11:13:10 (17:13:10 UTC) Liv driving, Stbd to Port: touchdown

Race Team sailed higher than every Sassnitz boat at 17.5-22.5 km/h, and that is where its speed went. The figures here are the average of the two tacks, because B15's wind sensor reads differently on each (Deep dives). The tables below are as built, so a team that sailed mostly on port looks better there than it was.

• 17.5-20: Race Team sailed 44.7 deg at 47.6 km/h, for 35.1 km/h of VMG (27 periods). NZL (Sassnitz) sailed 46.1 deg at 48.3 km/h (33.9), AUS (Sassnitz) 46.9 at 48.9 (32.8) and FRA (Sassnitz) 49.3 at 50.9 (33.6). At this wind strength the high mode paid.
• 20-22.5: Race Team sailed 45.4 deg at 49.6 km/h (34.9, 23 periods) and Development 44.2 at 50.3 (35.7, 14). NZL (Sassnitz) sailed 43.2 at 50.1 (36.7) and FRA (Sassnitz) 46.7 at 54.6 (37.4). Here FRA (Sassnitz)'s extra 5 km/h was worth more than Race Team's 1.3 deg.

Development with Jake on flight control matched FRA (Sassnitz)'s mode at 15-17.5 km/h: 51.2 deg at 48.5 km/h for 31.7 km/h of VMG, against 51.5 deg at 49.4 for 31.5. At 17.5-20 it stayed at 52.0 deg with no more speed (48.7 km/h), for 31.2 against 33.6-33.9. Liv driving had the angle of NZL and FRA (Sassnitz) at 15-17.5 (50.8 deg) but 2.5-4 km/h less speed (45.1 km/h), for 29.3 km/h of VMG. Development Team sailed all 16 of its periods at 17.5-20 on port, so its 40.6 deg there is mostly the sensor. At 20-22.5 it matched NZL (Sassnitz).

How steady the boat was (in every report from today: ride-height and heel deviation inside each 6 s period). At 17.5-20 km/h Race Team had 72 mm and 0.61 deg, Development 71 and 0.77, Liv 85 and 0.58, and Jake FC 108 and 0.85. NZL (Sassnitz) had 78 and 0.64, FRA (Sassnitz) 81 and 0.76, and AUS (Sassnitz) 89 and 0.63. Jake's session was the least steady at 15-17.5 too, at 104 mm against 59-87.

What differs at 17.5-20, on the same wing, boards and rudders (the settings table is below):

• Jib lead is 51-60 % for all four of our columns, against 38-44 for NZL, FRA and AUS (Sassnitz), the same gap as against Valencia on 6 Nov. With the same jib and crew, that is a setup question for the crews.
• Twist was 18.5-21.6 deg for our four columns, against 25.4 for NZL (Sassnitz) and 23.1 for FRA (Sassnitz), and CA6 was less inverted (-4.0 to 0.0 against -7.3 and -4.8). Every team's own fast quarter had more of both (Deep dives).
• Wing rotation was 9.1-11.1 deg against 7.6 for NZL (Sassnitz).
• Leeward cant: Development carried about 1 deg more cant (0.5 deg, - = more) than Race Team and the Sassnitz boats (1.2-1.9), and Jake FC and Liv about 1 deg less (2.3-2.9).

At 20-22.5 km/h Race Team was the best boat, and at 17.5-20 it was 4 deg too high. These are averages of the two tacks, as on Upwind.

• 20-22.5: Race Team sailed 145.7 deg at 63.1 km/h, for 51.9 km/h of VMG (19 periods). FRA (Sassnitz) sailed 140.7 deg at 63.4 (50.4) and NZL (Sassnitz) 137.0 at 57.6 (44.8). Race Team was deeper at the same speed.
• 22.5-25: Race Team sailed 147.4 deg at 62.6 km/h (53.1), level with FRA (Sassnitz)'s 147.6 at 63.8 (54.4).
• 17.5-20: Race Team sailed 135.9 deg at 61.0 km/h (44.2, 14 periods), Development 133.1 at 57.2 (40.6, 7) and Jake FC 137.7 at 55.7 (41.5, 12). FRA (Sassnitz) sailed 139.8 deg at 60.0 (46.6) and AUS (Sassnitz) 140.2 at 56.9 (43.7). So Race Team should sail about 4 deg deeper and Development 6-7 deg deeper. Jake FC had nearly the angle but 4 km/h less speed than FRA (Sassnitz).
• Liv sailed 6 of 8 periods at 17.5-20 on starboard (140.4 deg at 57.1 km/h), so its figure isn't averaged across the tacks.

How steady the boat was at 17.5-20: ride-height deviation was 96 mm for Race Team, 111 for Development, 87 for Jake FC and 88 for Liv, against 74-95 for the Sassnitz boats. Heel deviation was 0.64, 0.84, 0.83 and 0.66 deg against 0.60-0.77.

What differs at 17.5-20 (the settings table is below):

• Jib sheet more eased and lead further out: 38-46 % eased and 62-71 % lead for our columns, against 33-37 % and 58-65 for NZL, FRA and AUS (Sassnitz).
• Clew nearer the centre: -80 to +8 mm against -139 to -276.
• CA6 less inverted for Development, Jake FC and Liv (13.5-17.8 deg) than for Race Team (6.7), NZL (Sassnitz) (8.9) and FRA (Sassnitz) (10.3). Each team's fast quarter downwind had a lower CA6 and more twist (Deep dives).

No starts today, so there are no reaches. A reach is only start line to M1.

Every team is in the tables now. A tack counts when it keeps at least 65 % of that crew's straight-line VMG in the same wind, and a gybe at 70 %. A crew is one of our teams or one Sassnitz boat. It's a fixed standard, not a ranking, so a day of good turns keeps them all, and the four crews sharing B15 aren't ranked against each other. It kept about two-thirds of the turns today and at Sassnitz. With BRA left out, GER (Sassnitz) was the best tacker that day and ESP (Sassnitz) the best gybing boat, and AUS (Sassnitz) is shown beside them. The tracks start 8 s before the turn, so the run-in shows.

Tacks at 17.5-20 km/h: come out higher. All four teams came out at 59-64 deg (12-16 s after), against 50-51 for GER and NZL (Sassnitz). That is the same thing that separated Race Team's good tacks from the rest (Deep dives). Race Team still made 25.0 km/h through (6 tacks), level with GER (Sassnitz)'s 24.8 (10), because it carried more speed: 42.2 km/h at +10 s against 40.6. Development made 23.1 (2), Jake FC 22.3 (7) and Liv 20.5 (6), against 21.9 for NZL (4) and 21.3 for AUS (10). Jake FC's 7 dropped to 498 mm at the lowest and one touched down.

Tacks at 20-22.5 km/h: level with the Sassnitz boats. Race Team made 24.7 km/h through (7 tacks), against 25.0 for NZL (Sassnitz) (4), 24.4 for GER (3) and 23.6 for AUS (5). Development made 22.4 (3).

Liv at 15-17.5 km/h made 18.6 km/h through (7 tacks), against 22.4-22.8 for NZL and GER (Sassnitz) and 18.3 for AUS. It came out at 69 deg with 30.0 km/h at the lowest, and 1 of the 7 touched down.

Touchdowns at 15-22.5 km/h (every tack, kept or not): Race Team touched down in 4 of 30 tacks, Development 2 of 10, Jake FC 1 of 11 and Liv 1 of 14. NZL (Sassnitz) did in 2 of 36, GER (Sassnitz) 3 of 27 and AUS (Sassnitz) 7 of 32. Across the day, 6 of the 9 came out of Stbd to Port tacks (Deep dives). A turn that touched down can still count if it held enough VMG, so the touchdown rate shows in the tables too.

Gybes: at 20-22.5 km/h Race Team made 44.1 km/h through (5 gybes), against 43.0 for ESP (Sassnitz) (9) and 40.1 for AUS (2), so its gybes in breeze are a strength. Jake FC made 41.2 (2) and Liv 40.6 (3). At 17.5-20 Jake FC made 37.9 (4), level with ESP's 37.3 (14), Development 35.3 (4) and Race Team 34.9 (6). Race Team went in at 57.5 km/h against 61-63. Race Team touched down in 3 of its 23 gybes: 10:22:22 (16:22:22 UTC), 10:27:39 (16:27:39 UTC) and 11:37:21 (17:37:21 UTC). One of them still held 70 % and is in the 15-17.5 column. The other teams had none in 24.

The type filter at the top separates Full Foiling turns from the few that came out to H1 or H2. Untick a team or a type and the tables and time series are worked out again for what is left. Board cant, old board is a new time series under every band: the board to leeward going in, which is outside through the turn and the one raised. It shows Leo's cant out against the held cant tack by tack (Deep dives).

No starts or course today: training sessions only.

No course marks today.

The day. Every 2026 calendar day was searched, boat by boat and minute by minute, for the 24 m wing, LAB2 boards and HSRW rudders. Sassnitz Thu 20 and Fri 21 Aug are the only other days on that setup. 21 Aug is the one in today's breeze, and the coach confirmed NZL had the Big jib and six on board on both days.

Rudders checked independently of the setup channel. Rudder rake at the same pitch separates the rudders. Foiling at 15-22.5 km/h, B15 sits inside the Sassnitz fleet on both points of sail, so today was on the same rudders as that fleet:

LARW reads about 3.5-4.2 upwind, so these are HSRW. B15's rudder selector read LARW until 09:14 and HSRW after, while the rake read HSRW all morning, so only the first 6 minutes' polar was wrong.

Six sessions, four columns. Race Team's three sessions are one team. Development with Jake on flight control and Liv driving have their own columns, as asked, and each has its own bar.

One rule, with each boat's own bar.

• Periods first: foiling for the tables, wing set (camber at least 15 deg), and not within 10 s of a turn.
• Speed for angle: periods where boat speed fell over 1 km/h inside the 6 s while turning up (upwind) or bearing away (downwind) are left out.
• Each boat's bar: a period must be at or above 95 % of that boat's or team's own median VMG in that band.
• The figures: averages of what clears the bar.
• Manoeuvres: away from marks, real turns only. A tack counts when its VMG through is at least 65 % of that crew's straight-line VMG (the median of its foiling periods in the same wind band and point of sail), and a gybe at 70 % (coach, 7 Nov). A crew is a boat or one of our teams. It's a fixed standard, so a day of good turns keeps them all. It kept 65-72 % of turns on Sassnitz 21 Aug and on 6 and 7 Nov, with each crew between 47 and 87 %. Unlike the Filter Score it replaced, it barely moves with the wind (r = 0.1 against 0.31-0.48). They are medians.

Best boat. It's the best average VMG with the wind taken out, weighted by how much of today's sailing was in each band. BRA is never a comparison boat. AUS (Sassnitz) is shown wherever it isn't best.

The morning's data. B15's stream didn't reach the database before 09:42, so 09:08-09:42 comes from the 5 Hz file the coach downloaded. Over the three minutes both cover, its 62 channels match the database at 0.5 s, timing within 0.2 s. Only GPS differs (degrees against 1e-7 degrees), and that is converted. The file has no board button, twist input, camber input, maximum twist or cant command channels, so the morning's board marks are the stow states and those settings are blank before 09:42.

Every boat is banded on its own sensor. B15 sails alone, so its sensor can't be checked against another boat on the water. It can be checked against itself: in the same few minutes the wind is the same on both tacks.

Today it wasn't. Each period was compared with the other tack's periods within 4 minutes either side (medians, port minus starboard):

The wind is the clearest test, and B15's 2-3 km/h is outside anything the Sassnitz boats show. TWA splits of 3-4 deg turn up on fleet boats too, because sailors play the shifts, so the 6 deg is partly sailing. It changed sign from 6 Nov, which points at the sensor's calibration rather than at the boat. Get the wind sensor checked before the next day.

What it does to the tables. A port period reads about 1 km/h under the two tacks' average and a starboard period about 1 km/h over, so port periods land in a lower band and look quicker. That moves a team's VMG by up to about 2 km/h, depending on how much it sailed on each tack. The commentary uses the average of the two tacks wherever a team had at least 3 periods on each:

Speed calibration is still unknown, as on 6 Nov. No mark boats reported wind today, so there is nothing to compare the level with.

Comparing a team with itself removes the setup. These use each team's foiling periods with speed-for-angle periods out and no bar, because a bar would remove the slow ones. They are at the same angle, with the wind taken out, comparing the fast quarter with the slow quarter, as averages.

All four teams tell 6 Nov's story again. Upwind, each fast quarter carried 22-24.5 deg of twist with CA6 at -4 to -7, and each slow quarter 11-18 deg with CA6 at 0 to +8. The fast quarters also had about 2.5-4 deg more leeward cant and a little less jib sheet eased (26-28 % against 31-35 %). Downwind, twist again separates them (16-20 deg against 9), with CA6 lower in the fast quarter. Development and Jake FC also had much less jib sheet eased in their fast quarters (31-35 % against 48-50 %).

Two cautions. Each pair sat in the same wind to within 0.9 km/h, but the tack split in B15's wind sensor could still sort port periods into the fast quarter. And load follows speed, so the jib loads may be the result. Twist and sheet are the settings to test on purpose.

Each team's periods above its own bar, with the wind taken out, plus the two named sessions.

Upwind, Development was 2.0 km/h of VMG ahead and Race Team level, with Jake FC 0.4 and Liv 1.4 behind. Development's figure is port-heavy, though, so the sensor flatters it. Downwind Race Team was 1.2 km/h ahead, Development 0.7, Liv 1.6 behind and Jake FC 2.1 behind. Race Team was steadiest on the rudder downwind, with 0.60 deg of movement inside a period against 0.71-0.79.

A spell counts when the boat was sailing upwind with the wing set and either both hulls were under 400 mm or a hull was under 200 mm for over 3 s. Race Team had 12 spells (131.5 s), 9 of them near a turn, so its time off the foils is mostly tacks. Development had 7 (65.5 s), Jake FC 2 (16 s) and Liv 1 long one (59.5 s, in 14.9 km/h). The Upwind tab has the time in each sailing mode. Every team foiled 83-99 % of its upwind time at 17.5-20, against 74 % for NZL (Sassnitz).

Every one of Race Team's 31 tacks, at 5 Hz from the moment the heading was directly into the wind (T = 0), with the downloaded file before 09:42 and the database after. Block 1 is 09:10-09:35, block 2 10:10-10:35, block 3 11:33-11:40.

How each one is judged. Good: 25.5 km/h or more through it, both hulls above 400 mm and at least 33 km/h at the lowest. Poor: a touchdown (a hull under 100 mm), a hull near it, under 20 km/h through it, or under 30 km/h at the lowest. Left out of the comparisons: round-ups from a reach (entry over 75 deg) and tacks within 25 s of another. Bore away after it: exit TWA over 80 deg, so VMG through says nothing. Peak heel is onto the new leeward side, from -3 to +6 s. Old board cant is at its up button, with how far it moved from 8-5 s before in brackets (- = more cant). Lowest hull is the report's own figure, the same as on Manoeuvres.

What the five good ones had in common. They are 09:20:10, 09:21:14, 09:24:08, 09:25:18 and 10:13:47. Against the other 13 clean tacks (no touchdown, no bear-away after), as medians:

The speed through the turn was the same. The good ones made their ground at each end: they went in from close-hauled at speed and finished the turn at an upwind angle instead of running on to 59 deg. Over Race Team's clean tacks, exit TWA goes with VMG through at r = -0.70, entry TWA at -0.41 and the late rudder at +0.55. The good ones also had 1.8 km/h more wind (21.3 against 19.5), part of which may be the sensor's tack split. Four of the five were in block 1.

The poor ones. 09:33:12 and 10:32:50 had plenty of speed (48.6-48.7 km/h at +10 s) but went in from 59-63 deg and came out at 68-69, which makes them course choices rather than bad turns. 10:31:14 went in slow (43.4 km/h) and heeled 8.4 deg. The touchdowns were 09:30:09 (11 s after the previous tack), 10:20:25 (a round-up from 78 deg, the hull going in after +10 s), 10:25:27 and 11:38:47.

This morning's finding holds over the whole day. Race Team's clean tacks without a touchdown, medians, T = 0 when heading into the wind:

• The difference is roll. Port to Stbd, the boat heeled 6.6 deg onto the new side against 2.9, the starboard hull rose 265 mm against 165 for the port hull, and it peaked a second later (+2.0 against +1.0 s).
• What goes with it: on Port to Stbd the old board went up later (+2.8 against +2.2 s), the rudder was held harder against the turn afterwards (-5.7 against -3.9 deg), and the boat came out lower (60 against 53 deg).
• The same both ways: the board down button (-4.1 and -4.2 s), both boards down (6.8 s), the camber inverting (-0.6 s), peak yaw within 3 deg/s, and VMG through (24.1 km/h).

The other way round, the same hull goes down. Every tack today, all teams:

Race Team's three Stbd to Port touchdowns were all the starboard hull going in 4-10 s after the turn. So the starboard hull flies high when it's outside and drops when it's inside. In straight-line sailing it also flew about 35 mm higher as the leeward hull on port tack than the port hull did on starboard, in the same minutes. The new board's angle of attack through the turn was the same both ways, so the boards' settings don't explain it from the data.

What to try. On Port to Stbd, get the old board up by +2.2 s, as on Stbd to Port, and use Leo's cant out: 11:39:52 was Port to Stbd with the cant all the way out and heeled 2.9 deg, against the 6.6 median. On Stbd to Port, watch the starboard hull from +4 to +10 s. Look at 09:20:10 (1,772 mm) and 10:25:27 (touchdown) side by side on video.

Leo, the flight controller, thought the tacks at the very end, starting the cant out during the turn and getting it all the way out for the board raise, were better. The data agrees the boat comes out flatter. It doesn't yet show the boat comes out faster.

What changed. From 11:28 (Liv driving's last three tacks) and through Race Team's last block, the old board's cant command dropped from 50-85 % to 0-40 % at about -5 to -3 s. The board canted out 4-10 deg (- = more cant) before its up button. Before that, every tack held the old board's cant within about 2 deg of where it was until the raise, with the command at 50-85 % until the board came up. These are the 8 clean cant-out tacks at 16-21.5 km/h:

Against the 44 other clean tacks in the same wind, all teams:

What the data agrees with: the boat comes out flatter. With the cant held, the heel onto the new side climbs to 5.1-5.4 deg at +2 to +3 s. With the cant out it stays near 1 deg (chart below). A random split of these tacks gives a gap that big about 1 time in 1,000. Even among the held-cant tacks, the less the old board was canted at the raise, the more the boat heeled (r = 0.55 over 44 tacks), which is the mechanism Leo describes. Race Team's five alone show the same, 3.1 deg against 6.0.

What it doesn't show yet: less flare or more speed. The outside hull peaked at the same height (1,350 against 1,381 mm). The boat is flatter because the inside hull stays 100-130 mm higher from +2 to +6 s, not because the outside hull lifts less. The lowest speed (32.1 against 32.4 km/h) and VMG through (20.5 against 20.8) are level, and speed at +10 s was 2 km/h lower. These tacks also went in from 60 deg against 49 and came out at 66 against 63, all in the last 12 minutes, so they weren't sailed like the rest. Sailed the same way, they might come out ahead.

Two warnings.

• The inside hull: 3 of the 8 put it under 130 mm, against 6 of the 44. They were 11:29:28 (125 mm at +7.6 s), 11:34:26 (126 mm at +4 s) and 11:38:47 (a touchdown at +9.4 s). With the old board out, the new board carries the boat sooner. The cant-out tacks also had the old board up later (+3.1 against +2.4 s) and so stayed longer on two boards (7.9 against 6.8 s).
• Timing: 11:38:47 started the cant at -0.4 s and only got it from +5.1 to +1.5 deg. It heeled 6.9 deg, like a held tack, and touched down. The two that got it all the way out early, 11:34:26 (-9.8 deg) and 11:39:52 (-8.5 deg), heeled 2.4 and 2.9 deg. 11:39:52 was the cleanest of the block: 37.5 km/h at the lowest, 860 mm lowest hull and 43.8 km/h at +10 s.

What to do next. Keep it, because it takes out the heel the sailors feel. Start the cant by -3 s and get it fully out before the up button. Then test it head to head: alternate cant out and held, 6 of each in each direction, from the same entry angle (about 45-50 deg) and in the same wind, and watch the inside hull from +4 to +10 s. Port to Stbd is where it should pay most, because that's where the boat heels (6.6 deg median with the cant held).

• Wind bands: 2.5 km/h, on each boat's own wind reading corrected by its calibration offset for the day. Offsets (km/h, + = the sensor reads high), from moments boats sailed within 150 m of each other: B15 +0.0.
• Bands are never merged. A band is shown only with at least 5 of our periods and 3 other boats with 5 each; for manoeuvres and roundings, 2 of ours and 3 other boats with 2 each.
• Racing is split by leg (leg 1 = reaching, the final leg left out). Practice is split by wind angle: upwind at or below 75°, downwind at or above 120°.
• Samples: 6 s straight-line periods from the app (upwind, downwind), each the mean of its ~12 half-second readings; 2 s chunks of the steady part of leg 1 (reaching: 10 s after the start to 5 s before mark 1).
• Angle words: higher = closer to the wind (a smaller TWA) and lower = further from it (a bigger TWA), upwind and downwind. Upwind, 50 deg is higher than 52 deg. Downwind, deeper = a bigger TWA, so 140 deg is deeper than 130 deg, and 130 deg is higher.
• Periods: an upwind or downwind period is left out if it starts within 10 s of one of the boat's tacks, gybes, bear-aways or mark roundings (the boat is still accelerating), if the wing is not set (under 15 deg of camber, as on a tow), or if it is trading speed for angle: boat speed falling over 1 km/h inside the 6 s while turning up upwind or bearing away downwind. What is left must be at or above 95 % of that boat's own median VMG in that point of sail, sailing mode and wind band; with teams named, each team has its own bar. The table below shows what each step removed race by race.
• Period figures are averages of what clears each boat's bar, so VMG, speed and TWA describe the same periods. They compare better sailing with better sailing, not how often a boat gets there. Manoeuvres, roundings and starts stay medians, because they are few. No figure rests on a single sample. Fleet = the median of the other boats' figures, so each boat counts once. Best boat = the other boat with the best: average VMG (km/h) upwind and downwind, VMC to mark 1 on the reach, VMG through the manoeuvre on tacks and gybes, metres below target on bear-aways, exit speed on roundings, metres at mark 1 on starts. VMG % is against each team's own polar, so it is shown for us but never used to rank boats.
• Targets: SPEED v2 cheatsheet, LAB2 24m with the Big jib and HSRW rudders: the sheet's row at the band's lower wind speed (the 30 km/h row for 30-32.5), as written, never interpolated. Clew targets are converted to mm with the sign turned round (- = to windward, as in the data); jib track is converted from sheet angle to jib lead % (0 % = fully inboard). Not compared: jib sheet load (the sheet's units are not kgf yet).
• Phases included: practice, racing. Races left out: none. Crew on board: 6. Notes: 24 m wing, LAB2, HSRW. Race Team 09:10-09:35, 10:10-10:35, 11:33-11:40; Development Team 09:40-10:05; Development Team with Jake on flight control 10:40-11:05; Liv driving 11:10-11:33. 09:08-09:42 from the downloaded 5 Hz file (stream not reaching the database)..
• Past event days (Sassnitz 2026-08-21): every boat follows one rule. Periods trading speed for angle are left out, then a period must be at or above 95 % of that boat's own median VMG in its band, and period figures are averages of what clears that bar. For tacks and gybes, a tack counts when it keeps at least 65 % of its crew's straight-line VMG in the same wind and point of sail, a gybe at least 70 %, the crew being a boat or one of our teams; a fixed standard, not a ranking. They stay medians. Bands are each boat's own sensor. The Deep dives tab has the detail.
• Manoeuvres are free manoeuvres only: anything within 10 s of the start, a mark or the finish belongs to the Mark roundings tab, and anything after the finish is left out. Practice tacks and gybes with an app quality score under 25 are left out (the boat was not trying); racing ones are all kept.
• VMG through the manoeuvre = ground made upwind (tacks) or downwind (gybes) over the app's 25 s window, in km/h - the measure that compares boats directly. Metres lost is the app's ghost-boat figure; each ghost holds that boat's OWN pre-manoeuvre VMG, so a boat that was quicker going in shows more loss for the same turn. For bear-aways it is distance sailed below the boat's target speed over 15 s. Touchdown = lowest hull under 100 mm.
• Reaches are start line to M1 only: the steady part, 10 s after crossing the line to 5 s before M1, straight and foiling, as 2 s samples, with medians of those. Practice sailing at reach angles is left out on purpose: on 6 Nov 2026 it was mostly turns and acceleration, with TWA moving over 3 deg inside 77 % of those periods. A reach is only compared inside one wind band and one TWA range (55-80, 80-100, 100-130 deg), both taken from the whole reach, because speed moves far more with angle than with wind.
• Tracks are GPS, and up the page is always where the wind is coming from: the average TWD of the 60 s either side of the moment, leaving out the 10 s around a turn. A turn's fixed point is the moment its heading crosses that wind, directly into it on a tack and directly with it on a gybe, and its line runs from 8 s before to 10 s after. That is not the TWA crossing in the tables, which lags the heading through a turn. Turns entered on port are mirrored. A start's line runs from 30 s before the gun to M1, and guns sharing a start line and M1 overlay on one chart. A bottom mark line runs from 7 s before the closest pass to 10 s after, the mark at the centre, on one chart for right turns and one for left, taken from the boat's heading.
• Turn time series share that fixed point as T = 0 and run from 10 s before to 10 s after, longer than the tracks so the board down button shows. Yaw rate and rudder read + into the turn; clew, heel and AWA-E1 are on the exit tack's sign, so + is to leeward coming out. The old hull and board are the ones to leeward going in, the new ones to windward going in. The AoA limiter is the boat's own limit, ANGLE_DB_RAKE_LIM_deg, a rake floor already allowing for pitch. They read the report's 0.5 s data: AWA-E1 is a 1 Hz channel and clew a 2 Hz one. The button marks are the new board's down press and the old board's up press, the moment the 20 Hz board command goes on, which is ahead of the stow states the app reports. The wing invert is the app's: camber 1 passing through zero. Each mark sits on the line at that moment. The dashed trend is a team's median at each moment, like every other manoeuvre figure, and needs two turns with a value there.
• Manoeuvre type is the commonest sailing mode from 9 to 3 s before the crossing and from 8 to 14 s after it: Full Foiling, H2, H1 to H1, Foiling to H1 and so on. Coming out starts at 8 s because the board is still raising until then. Not settled means one end was none of the modes: a hull at 200 to 400 mm, or a board still moving. The filter at the top of the tab only changes which turns are shown and counted; a single turn is never a median, so a column needs two.

What the filters removed