Sailmaker Mark Ploch reckoned, correctly, that with more speed, we'd have better control, so by midafternoon we'd swapped the storm jib for the No. 4 headsail. Instantly, we were making 6 knots. But the faster speeds proved too much for the drogue, which at 3 knots stayed submerged and provided the necessary drag to maintain course but skipped and planed atop the following waves at anything quicker. And once the drogue was clear of the drink, Serengeti instantly sprang up toward the breeze. (The position of the drogue was also critical to the overall exercise, particularly because the waves were so close together. After a lot of trial and error, it became clear that the device worked best when streaming about 100 feet aft.) We tried trailing sheets and lines aft to induce more drag, but their effect was minimal. Reluctantly, down came the No. 4 and back up went the storm jib.