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Patent 5249995: Marine drive having two counter-rotating surfacing propellers and dual propeller shaft assembly (4244 words) |
 | Needle bearing 66 is positioned between propeller shaft 42 and bearing support housing 48 in extended bearing support portion 64 such that the propeller shafts are supported over a length to prevent bending of the propeller shafts during the surface operation of the propellers as the propellers strike and pierce the surface of the water. |
| Propeller 12 is mounted on inner propeller shaft 40 between ring 134 and nut 140 and is engaged forwardly at tapered outer surface 138 of ring 134, and is engaged rearwardly at tapered outer surface 142 of nut 140. |
| Propeller 14 is mounted on outer propeller shaft 42 between ring 150 and nut 156 and is engaged forwardly at tapered outer surface 154 of ring 150, and is engaged rearwardly at tapered outer surface 158 of nut 156. |
| feathering sailing boat propellers QA (4784 words) |
| When no drive is applied via the propeller shaft and the vessel is under sail, water flow past the propeller blades forces the propeller hub to rotate around the stationary shaft until the blades align with the water flow and cease rotating the hub. |
| Most current self-feathering propellers have a gear connected to the propeller shaft, the gear and shaft are free to rotate within the hub of the propeller, but are limited in the extend of their travel by some form of limit stops. |
| This means that once the propeller shaft and blades have rotated to the correct position and up to the limit stops, all engine torque used to physically drive the propeller is transferred directly from the shaft to the propeller hub and blades, not via the gear mechanism. |
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