Session Details
Harm Jaap de Witt
Saturday 28 March 2026
Board -
Tabou Manta 71, 2015 
Sail -
Duotone Warp 20.20 7.0, 2020
Fin -
Tribal Fin MK2 Carbon 37 
GPS -
Locosys GW-60
Max 2 sec
30.12 knots
Rating
Average speed
28.82 knots (29.55 29.22 28.72 28.48 28.12)
100m
29.77 knots
250m
29 knots
500m
28.14 knots
500m
28.14 knots
1/2 hour
15.32 knots
1/2 hour
15.32 knots
Hour
10.82 knots
Duration
00:30:27
Hour
10.82 knots
Duration
00:30:27
Nautical Mile
26.06 knots
Alpha racing
14.47 knots
Distance
20.12 km
20.12 km
Wind Speed
16 knots
Wind direction
WNW ( 293)
Paar rakjes lafjes naar H'wijk op en neer, rug werkte niet mee dus snel gestopt. Volgende keer hopelijk beter.
Filter Rankings
Day Rank - speed
| # | Rider | Avg | |
|---|---|---|---|
| 1 | Rob Allersma | 31.20 | |
| 2 | Pieter Rietveld | 31.11 |  |
| 3 | Marco Lambers | 29.51 | |
| 4 | Harm Jaap de Witt | 28.82 | |
| 5 | Mark Spierings | 28.38 | |
| 6 | Marcel Mulder | 28.01 | |
| 7 | Armand van Renssen | 27.07 | |
| 8 | Mark Oosterhuis | 26.98 | |
| 9 | Ton van der Werf | 26.59 | |
| 10 | Marijn Rijswijk | 26.14 | |
Day Rank - speed
| Rider | Avg | 2 Sec | 500m | Mile | Hour | Distance | Alpha | |||
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | |
Rob Allersma | 31.20 | 33.31 | 30.28 | 27.50 | 11.44 | 67.26 | 0.00 | |
| 2 | |
Pieter Rietveld | 31.11 | 32.06 | 30.85 | 25.47 | 13.64 | 46.39 | 10.99 | |
| 3 | |
Marco Lambers | 29.51 | 30.66 | 29.47 | 26.45 | 14.35 | 59.29 | 0.00 | |
| 4 | |
Harm Jaap de Witt | 28.82 | 30.12 | 28.14 | 26.06 | 10.82 | 20.12 | 14.47 | |
| 5 | |
Mark Spierings | 28.38 | 30.18 | 28.20 | 25.41 | 11.00 | 52.47 | 10.70 | |
| 6 | |
Marcel Mulder | 28.01 | 29.00 | 28.02 | 23.34 | 6.06 | 25.60 | 0.00 | |
| 7 | |
Armand van Renssen | 27.07 | 28.57 | 27.34 | 23.45 | 16.85 | 73.88 | 17.24 | |
| 8 | |
Mark Oosterhuis | 26.98 | 28.59 | 26.87 | 23.59 | 9.76 | 30.45 | 8.61 | |
| 9 | |
Ton van der Werf | 26.59 | 27.78 | 25.75 | 24.40 | 11.63 | 31.52 | 18.67 | |
| 10 | |
Marijn Rijswijk | 26.14 | 29.65 | 27.31 | 25.96 | 9.11 | 30.26 | 15.71 | |
Wind Observation
| 🕐 | 8h | 9h | 10h | 11h | 12h | 13h | 14h | 15h | 16h | 17h | 18h | 19h | 20h |
| ↗ | |||||||||||||
| kts | 12 | 8 | 11 | 15 | 12 | 15 | 16 | 16 | 18 | 16 | 14 | 15 | 13 |
| kts* | 25 | 11 | 19 | 29 | 17 | 23 | 31 | 22 | 30 | 29 | 19 | 23 | 28 |
| °C | 8° | 7° | 7° | 8° | 8° | 9° | 9° | 9° | 9° | 8° | 8° | 8° | 6° |
| Time | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Direction | |||||||||||||
| Wind | 12 | 8 | 11 | 15 | 12 | 15 | 16 | 16 | 18 | 16 | 14 | 15 | 13 |
| Gust | 25 | 11 | 19 | 29 | 17 | 23 | 31 | 22 | 30 | 29 | 19 | 23 | 28 |
| Degrees | 315° | 293° | 293° | 315° | 315° | 315° | 293° | 293° | 293° | 293° | 293° | 293° | 293° |
Session Achievements
Achievement |
Category |
Speed Type |
Speed |
Rank |
|---|---|---|---|---|
BestYear |
100 |
29.77knots |
#1 | |
BestYear |
10sec |
29.55knots |
#2 | |
BestYear |
24hour |
10.87knots |
#3 | |
BestYear |
250 |
29.00knots |
#4 | |
BestYear |
2sec |
30.12knots |
#5 |