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The "Sailing on Optimist. Wind up to 35 knots. (Optimist planing)" video is part of the Sealing, tipps, boating category, which contains similar videos like this one.
In this video he was 10 yrs old and weight was around 25 kg
Maybe some physics expert can explain it. Video is captured with GoPro on a very shallow but quite big lake around 200-500 meters from shore. Water depht is around 1,5 - 2 meters. Wind blows from shore. There was very small waves for this wind. Skip first 1.50 minutes to see higher boat speeds.
10. comment for Sailing on Optimist. Wind up to 35 knots. (Optimist planing)