| 摘要 |
An improved rigid impeller held for driven rotation within the housing of a water jet drive for boats. The impeller includes a hub connectable to the output shaft of a motor, a plurality of impeller blades integrally formed with, and radially extending from, the hub, and an annular ring rigidly connected or integral with and between the outer ends of the impeller. The annular ring has a circular outer surface concentric with the axis of the hub and adapted to closely mate with, and rotate within, a mating circular surface formed in the interior of the housing such that water is efficiently driven through the housing from its inlet in the bottom of the hull of the boat through and discharging from its outlet in the transom of the boat.
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