English: Bluebottle (Physalia physalis) sail camber
Bluebottle course at zero angle of attack is dependent on the sail camber. Panel (a) shows a bluebottle with no camber sailing straight downwind with sail parallel to the wind direction. Panel (b) shows a bluebottle with camber. Due to the curvature of the sail, even at zero angle of attack, the bluebottle course will diverge from the wind direction.
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