First with isonic 70. Good but not full powered. Some nice runs and the best 250m at the day. Vmax 34.1 knots
Then I compared with the isonic 90 and sonntag gps 6 30 cm. Constant speed (32-33 knots) and good run with 34,7 vmax.
Both boards worked well but I felt better with isonic 70 because it needs less legs works :)
Nice day!
4 kg extra weigth
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