High pitch stall resisting propeller
US10400785B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Apr 7, 2015 |
| Grant date | Sep 3, 2019 |
| Priority date | — |
| Expiry date | Mar 21, 2036 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04D25/088
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A propeller formed along the lines of a vortex, i.e. a Fibonacci spiral projected onto a surface formed by a square hyperbola. Fluid flows evenly along the length of the propeller with less turbulence allowing it to operate at a higher pitch without stalling and resulting in reduced power requirements for a given flow rate. The underlying geometric shape of a vortex is an equiangular logarithmic spiral also known as golden spiral or Fibonacci spiral as is often found in natural objects ranging from sea shells to spiral galaxies. When viewed three dimensionally, the fluid flow in a vortex can be drawn as a projection of a golden spiral onto a surface of revolution of a square hyperbola where the vertex is equal to one and the focus is equal to the square root of 2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.