Patent ID: 9701405
Date: 2017-07-11
CPC Classifications: B64C

Claim:
1. A tail rotor device, which can be attached to a tail boom of a rotary wing aircraft, in particular of a helicopter, encompassing a sheathing, which forms an air flow channel with a channel depth running in the direction of a channel axis perpendicular to the longitudinal axis of the aircraft and an inner channel diameter, so that a tail rotor with a plurality of rotor blades can be rotatably mounted in the air flow channel, wherein the sheathing is designed in such a way that its channel depth in the longitudinal progression of the sheathing tapers in the direction away from the tail boom, wherein a selected variable channel depth is always smaller than one fourth of the inner channel diameter, and the ratio between the variable channel depth of the sheathing in the direction of the longitudinal axis and the inner channel diameter of the sheathing lies between 25% and 10%.