公开(公告)号：EP3317180A2

公开(公告)日：2018-05-09

申请号：EP16825927.3

申请日：2016-06-29

申请人： BLR Aerospace, LLC

发明人： CARPENTER, Michael ,  SMITH, Daniel, A.

IPC分类号： B64C23/06

CPC分类号： B64C27/82 ,  B64C7/00 ,  B64C23/06 ,  B64C2027/8263 ,  Y02T50/162

摘要： A strake may extend along a portion of an approaching side of a tail boom of a helicopter. A number of vortex generators (VGs) may extend along a portion of a retreating side of the tail boom. For tail booms with circular cross sections, the strake and the VGs are positioned between approximately 5 and 15 degrees below a horizontal plane of the tail boom when viewed end on, on respective sides of the tail boom. For tail booms with non-circular cross sections, the strake and the VGs is positioned between approximately 5 and 15 degrees above a location where a change in curvature is greatest (e.g., where flow separation would otherwise occur) on a bottom half of the tail boom when viewed end on, on respective sides of the tail boom. A fairing may be located on the retreating side on the upper half of the tail boom, to create an asymmetric profile.