Marine propeller
US10710688B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 20, 2017 |
| Grant date | Jul 14, 2020 |
| Priority date | — |
| Expiry date | May 8, 2038 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB63H1/20
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A marine propeller includes a plurality of blades attached to a hub, with a disk area ratio of approximately 50%, a blade area ratio of approximately 61%, a blade rake angle of approximately 26.5 degrees, a blade skew angle of approximately 0 degrees, and wherein the angle between the chord line at any given radius r on said blades with a line that is parallel to the propeller axis of rotation and intersects the chord line, is equal to tan−1(2πNr/Vo)−α, where N is the rotational speed of the propeller at a selected design condition, Vo is the speed of the water entering the propeller (i.e. the speed of the vessel) at the design condition, and α is the angle of attack at the radius r at said design condition, and where a is generally constant across most or all of the span of the blades at the design condition, and where the value of α may be selected to be lower near the hub than for the remainder of blade, and where additional camber is provided in the leading edge region, such that leading edge camber line angle of attack is reduced relative to the chord line angle of attack for the overall blade section.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.