Trimming device to control propeller forces affecting propeller driven boats
US4265626A · kind A · utility
Inventor
Key dates
| Filing date | Mar 8, 1979 |
| Grant date | May 5, 1981 |
| Priority date | — |
| Expiry date | Mar 8, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB63H5/16
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A trimming wedge is disclosed to trim a propeller driven boat for better performance. The wedge is fixed at its base to the center shaft housing of a propeller driven power boat. The trimming wedge extends approximately the length of one blade of the propeller and is positioned in front of and in line with the propeller blade. The trimming wedge or vane splits the water in front of the propeller so that the blade of the propeller passes through a void in the water. For example, when the wedge is positioned vertically downwardly from the shaft housing, the void occurs when the clockwise arc of the blade is in about the downward four o'clock to eight o'clock position when viewed from the rear. A trimming wedge with the proper wedge angle neutralizes the tendency of the propeller to "walk" the boat sideways or to the right with a clockwise turning propeller, thus transferring the side load thrust to forward thrust when the boat is propelled through the water, resulting in an increase in forward speed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.