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Surface piercing propellers are one of the preferred propulsion systems for high-speed crafts due to their favorable features such as no cavitation, low resistance, shallow draft and high efficiency. Since the propellers often operate in oblique flow with blade emergence, there will be vertical forces generated which will have an important impact on the hydrodynamic performance of the planing crafts. In this paper, the effects of vertical force generated by surface piercing propellers on hydrodynamic performance of a stepped planing craft through numerical and experimental methods were studied. And the cases for planing boat with different locations of center of gravity were also involved. The results show that the vertical force produced by surface piercing propellers has a positive effect on the resistance of the planing crafts and that the effect is related to the longitudinal position of the center of gravity of the planing boat. Consequently, the longitudinal position of the center of gravity should be adjusted to the stern for planing craft equipped with surface piercing propellers, and the vertical force of the propellers should not be too large.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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