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:
Oct. 03, 2017
Filed:
May. 28, 2015
Snecma, Paris, FR;
Anthony Pascal Eloi Louet, Alfortville, FR;
Clement Marcel Maurice Dejeu, Fontenailles, FR;
Jonathan Evert Vlastuin, Charenton Le Pont, FR;
SNECMA, Paris, FR;
Abstract
The invention relates to an aircraft turboprop engine having two unducted propellers, coaxial about a rotation axis (LL), respectively upstream () and downstream (), each propeller comprising an annular row of blades, the blades of the downstream propeller () each having a truncated head and each comprising a leading edge () and a trailing edge (), the radially external ends (AB) of which are distant from each other and are connected by a terminal edge (), characterised in that the terminal edge () of each blade of the downstream propeller () has, at at least two points, tangents in a meridian plane having different slopes, the upstream end (A) of the terminal edge defining a maximum radial dimension (R) of the blade and its downstream end (B) defining a minimum radial dimension (R) of the terminal edge.