| 摘要 |
PCT No. PCT/AU85/00246 Sec. 371 Date Jun. 12, 1986 Sec. 102(e) Date Jun. 12, 1986 PCT Filed Oct. 14, 1985 PCT Pub. No. WO86/02331 PCT Pub. Date Apr. 24, 1986.A propellor (10) for watercraft has a hub (11) with a pair of blades (12) with a leading portion (13) central portion (14) and trailing portion (15). The leading portion (13) of the blades are forwardly inclined relative to the hub (11) and the blades progress through the generally radial central portion (14) to the rearwardly inclined trailing portion (15), the radial height of the blades decreasing from the central portion (14) to the trailing portion (15). Both the peripheral pitch of the blades (12), and the pitch of the line of junction (16) of the blades (12) to the hub (11) increase along the propellor (10), at least from the central portion (14) to the trailing portion (15).
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