The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 03, 2021
Filed:
Apr. 22, 2019
Applicant:
Rolls-royce Plc, London, GB;
Inventor:
Giles E. Harvey, Derby, GB;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B64D 27/24 (2006.01);
U.S. Cl.
CPC ...
B64D 27/24 (2013.01);
Abstract
An electric ducted fan for an aircraft is shown. A nacelle defines a duct that houses a propulsive fan having a fan diameter D. An electric machine is configured to drive the fan, and has an electromagnetically active length Land an electromagnetically active diameter Ddefining an aspect ratio (L/D) of from 0.8 to 2. A ratio of the electromagnetically active diameter Dto the fan diameter D(D/D) is from 0.45 to 0.60.