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:
Jun. 21, 2022
Filed:
Nov. 04, 2019
Applicant:
Rolls-royce Plc, London, GB;
Inventor:
Martin N. Goodhand, Bristol, GB;
Assignee:
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B64C 21/06 (2006.01); B64C 7/02 (2006.01);
U.S. Cl.
CPC ...
B64C 21/06 (2013.01); B64C 7/02 (2013.01); B64C 2230/00 (2013.01);
Abstract
A boundary layer ingestion fan system for location aft of the fuselage of an aircraft is shown. It comprises a nacelle () defining a duct (), and a fan () located within the duct. The fan comprises a hub arranged to rotate around a rotational axis (A-A) and a plurality of blades attached to the hub. Each blade has a span (r) from a root at the hub defining a 0 percent span position (r=0) to a tip defining a 100 percent span position (r=1) and a plurality of span positions therebetween (r ∈ [0, 1]), and a stagger angle at the 0 percent span position (ζ) relative to the rotational axis of 40 degrees or greater.