| 摘要 |
An inboard propeller drive system for shallow water boats comprising a stern tunnel and a propeller drive shaft sub-assembly. The tunnel protrudes upwardly from the floor of the boat, and has an S-shaped bottom plate immersed in water. The sub-assembly includes a housed drive shaft, a propeller, a cavitation plate, and a steering mechanism. The forward end of the sub-assembly is pivotally mounted on opposing inner walls of the tunnel. A universal joint connects the forward end of the drive shaft to the output shaft of an inboard engine. A control shaft extends from the forward end of the sub-assembly to the exterior of the tunnel. The control shaft may be rotated by a user-controlled actuator to raise and lower the sub-assembly, thereby pre-determining the depth of the propeller. Encounters with submerged objects may also cause the sub-assembly to rotate upwardly to prevent propeller damage.
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