Session Details

Martin Koolma

Sunday 14 June 2026

Spot Lauwersmeer Netherlands

Board Future Fly Dark Horse 117, 2024

Sail Severne Mach 8 7.5, 2025

Fin Z-fins SLM S- 37

GPS COROS VERTIX 2S

Max 2 sec

34.6 kts

Rating

Average speed

33.69 kts (34.13 33.98 33.67 33.51 33.16)

100m

34.34 kts

250m

33.97 kts

500m

31.97 kts

½ hour

19.79 kts

Hour

19.04 kts

Duration

02:55:27

Naut. Mile

26.04 kts

Alpha

21.89 kts

Distance

106 km

Wind

15 knots

Gust

26 knots

Direction

W ( 270)

Weer een topdag!

Eindelijk vrienden geworden met de Zfins 37

Filter Rankings

Day Rank - speed

#	Rider	Avg
1	Ivo Fellinger	34.10
2	Martin Koolma	33.69
3	Johan Bulthuis	33.49
4	Gerlof Hansma	33.38
5	Jasper Jongepier	32.91
6	Marc Roosendaal	32.60
7	Anne Fahner	32.25
8	Anne Evert van der Veen	31.83
9	Marcus Stevens	31.34
10	Frans Sijbrandij	31.21

Day Rank - speed

Avg

		Rider	Avg	2 Sec	500m	Mile	Hour	Distance	Alpha
1		Ivo Fellinger	34.10	35.55	33.53	27.39	18.89	110.83	14.50
2		Martin Koolma	33.69	34.60	31.97	26.04	19.04	106.00	21.89
3		Johan Bulthuis	33.49	35.25	32.15	27.12	21.54	124.88	20.30
4		Gerlof Hansma	33.38	35.30	32.71	28.94	22.20	92.78	18.65
5		Jasper Jongepier	32.91	34.94	31.51	27.98	19.26	127.94	23.32
6		Marc Roosendaal	32.60	34.03	31.12	25.38	16.35	56.62	14.57
7		Anne Fahner	32.25	33.52	32.20	26.45	14.66	27.16	0.00
8		Anne Evert van der Veen	31.83	33.17	30.54	25.46	15.82	53.50	21.30
9		Marcus Stevens	31.34	32.29	30.10	26.38	17.75	71.46	21.30
10		Frans Sijbrandij	31.21	33.18	30.90	24.83	18.86	43.44	20.78

Gear size range

Sail (m²)

6.5 avg 7.2 7.8

Board (W)

63 avg 105 138

Fin (cm)

32 avg 38 42

Wind Observation

🕐	6h	7h	8h	9h	10h	11h	12h	13h	14h	15h	16h	17h	18h	19h	20h	21h	22h
↗
kts	19	19	17	18	19	17	18	19	19	18	20	18	19	20	18	19	19
kts*	29	31	30	31	32	32	33	32	34	32	34	33	36	32	33	32	32
°C	15°	14°	14°	13°	14°	15°	15°	15°	15°	16°	15°	15°	14°	16°	15°	15°	15°

Time	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22
Direction
Wind	19	19	17	18	19	17	18	19	19	18	20	18	19	20	18	19	19
Gust	29	31	30	31	32	32	33	32	34	32	34	33	36	32	33	32	32
Degrees	293°	293°	293°	315°	315°	315°	315°	315°	315°	293°	315°	293°	293°	293°	293°	293°	293°

Session Achievements

Category	Speed Type	Speed
BestYear	10sec	34.13knots
BestYear	250	33.97knots
BestYear	500	31.97knots
BestYear	alpha racing	21.89knots
BestYear	hour	19.04knots