US Patent No. 9,156,549

AIRCRAFT VERTICAL LIFT DEVICE


Patent No. 9,156,549
Issue Date October 13, 2015
Title Aircraft Vertical Lift Device
Inventorship Daniel Kent Vetters, Indianapolis, IN (US)
Andrew Barlow, Indianapolis, IN (US)
Assignee ROLLS-ROYCE NORTH AMERICAN TECHNOLOGIES, INC., Indianapolis, IN (US)

Claim of US Patent No. 9,156,549

1. An apparatus comprising: an aircraft having an engine operable to provide power; a lift fan powered by the engine and operable
to provide a lift for the aircraft along a vertical axis by producing a lift fan flow stream, the lift fan having a bladed
device structured to rotate about a rotational axis, the rotational axis fixed relative to the aircraft such that the rotational
axis is immobile relative to an aircraft axis during the entire time of operation of the lift fan when the bladed device is
rotated to produce the lift fan flow stream; a vane box fixed relative to the aircraft such that the vane box is substantially
aligned with a reference point on the aircraft and is incapable of moving relative to the aircraft during the entire time
of operation of the lift fan when the bladed device is rotated to produce the lift fan flow stream, the vane box positioned
downstream of the lift fan and housing a vane assembly structured to direct the lift fan flow stream in a downward direction,
the vane assembly having a plurality of vanes operable to direct the fan flow stream to a vertical vector for hovering flight,
a maximum aft vector for forward flight and a maximum forward vector for rearward flight; and wherein the vane box has a maximum
flow area when the plurality of vanes in the vane assembly are at a position other than the vertical vector, wherein the rotational
axis of the lift fan is oriented at an angle relative to the vertical axis.