| 摘要 |
The sleeve (6) unrolls from a fixed roller (7) and its sides slide under the hull by means of a metallic ballast (14) which directs the sleeve towards the rear of the boat. A roller (8) has two coils, driven by a motor at the same speed, and extracts the ropes housed in the rails (4). The rails are stuck to the port and starboard sides at a height sufficient to leave the portholes (10) uncovered and curve up at either end to reach the height of the boat at the front and rear. The balls (3) or, alternatively, rollers are welded to the latex.
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