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:
Jul. 17, 2001
Filed:
Apr. 05, 2000
T. Alan Egolf, Glastonbury, CT (US);
Brian E. Wake, Portland, CT (US);
United Technologies Corporation, Hartford, CT (US);
Abstract
Blade vortex interaction (BVI) noise, associated with the operation of aircraft having rotary-wing blades, is abated by the inclusion of an ovate loop tip (,) at the tip portion (,) of each of the rotary wing blades. The ovate loop tip (,) is substantially ovate in shape transverse to the direction of rotation of the rotary-wing blades (,). The ovate loop tip (,) includes upper and lower halves (,″) of similar or substantially identical geometry, and is positioned substantially symmetrically with respect to a plane (,) defined substantially by the chord of the rotary-wing blade at or near the tip portion (,). The upper and lower halves (,″) of the ovate loop tip (,) have a common origin or root at their point of attachment with the blade tip portion (,). This geometry and positioning of the ovate loop tip (,) reduces the intensity of the resulting tip vortex, while also minimizing additional loads and stresses on the blade.