公开(公告)号：EP3246247B1

公开(公告)日：2018-03-21

申请号：EP16174779.5

申请日：2016-06-16

Applicant: Bell Helicopter Textron Inc.

Inventor： FOSKEY, Christopher ,  BURNETT, Michael ,  BOSWORTH, Jeffrey ,  PAULSON, Jared ,  McINTYRE, Joel ,  OLDROYD, Paul K.

IPC: B64C11/24 ,  B64C11/26 ,  B64C27/473 ,  B64C29/00

CPC classification number: B64C11/26 ,  B64C11/24 ,  B64C27/473 ,  B64C29/0033 ,  B64C2027/4736

Abstract: A tiltrotor aircraft (10) includes a fuselage (12), a wing member (18) extending from the fuselage, an engine disposed relative to the wing member and a proprotor (26) mechanically coupled to the engine. The proprotor includes a plurality of proprotor blade assemblies (28) each including a spar (40) and a sheath (52) extending spanwise along the spar forming the leading edge (48) of the proprotor blade assembly. The spar has a root section (42), a main section (44) and a tip section (46). The spar has a generally oval cross section at radial stations along the main section and a first edge having a structural bias relative to a generally oppositely disposed second edge at the radial stations along the main section.