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Pedro Jimenez hoists a 240-square-meter spinnaker in 8–9 knots of true wind on a broad reach, with apparent wind at 4 knots.0:29 The spinnaker, described as a lightweight balloon sail deployed forward of the bow, is the boat's answer to near-calm conditions where the genoa and mainsail would produce only 3–4 knots of boat speed with constant slatting.Watch Wind angle is 120–180 degrees off the bow — the range where the spinnaker generates power by filling like a parachute.0:15 Once set, boat speed climbs to 6–6.7 knots on an apparent wind of 3.7 knots, meaning the boat is nearly keeping pace with the wind itself.1:38 The sail is flagged as dangerous above 15 knots of true wind, where dousing becomes difficult.1:12 The crew notes the boat tracks upright and steady under the spinnaker, contrasting with the rolling and noise typical of sailing downwind under conventional canvas in light air.1:48

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