Oar with openings in the blade
US10526063B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 22, 2016 |
| Grant date | Jan 7, 2020 |
| Priority date | — |
| Expiry date | Apr 22, 2036 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB63H16/04
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
Apparatus and method for propelling a watercraft. An oar has a blade and a shaft, the blade having a front side and a back side, the shaft having a longitudinal axis. The blade includes a plurality of openings which pass from the front side to the back side of the blade. In some cases, the openings are slit shaped openings oriented substantially perpendicularly to the longitudinal axis of the shaft. In other cases, the smallest lateral dimension of each opening is 5 mm or less. The openings may influence the flow around the blade so that the blade is more efficient, and thus may produce more useful work in moving a boat than a solid blade with no openings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.