Title:
プロペラ
Document Type and Number:
Japanese Patent JP6940322
Kind Code:
B2
Abstract:
To provide a propeller that has a small inertia moment not to deteriorate motor efficiency and has high energy efficiency.SOLUTION: A propeller 1 for a small unmanned aircraft has a central part and rotor parts 10 (30) formed integrally with the central part. An undersurface in the aerofoil section of the rotor part 10 (30) (the cross section vertically cut along the chord) is formed in a circular arc shape. The rotor part 10 (30) is formed to have a different attack angle according to a position in the wing span direction (the longitudinal direction), and portions continuous to the central part are formed as a motor cooling part 12 having a predetermined attack angle. A position closer to the motor cooling part 12 than the position of a half of the wing span (a length from the center of the central part to the tip of the rotor part) of the rotor part 10 (30) is formed as the maximum chord length part 14 having the longest chord length. An air stream density increasing means 14a extending downward is formed at the trailing edge 10b of a portion including the maximum chord length part 14.SELECTED DRAWING: Figure 2
Inventors:
Yukawa Okawa
Application Number:
JP2017144200A
Publication Date:
September 22, 2021
Filing Date:
July 26, 2017
Export Citation:
Assignee:
Advanced Mechanics Simulation Laboratory Inc.
International Classes:
B64C11/18; B64C39/02; B64D27/24
Domestic Patent References:
| JP6305492A |
Foreign References:
| CN205707330U | ||||
| CN102963522A | ||||
| US20160311529 | ||||
| US20140220873 |
Attorney, Agent or Firm:
Fumihiko Yagisawa
Takeshi Sato
Takeshi Sato