Patent ID: 8033498
Filing Date: 2011-10-11
Classification: B64C

Abstract:
1. A helicopter comprising a body portion, a plurality of spars, a plurality of rotor blades which are mounted for rotation with respect to the body portion, and a fan which is mounted for rotation in an opposite direction to the direction of rotation of the rotor blades, and the helicopter being such that the rotor blades are spaced apart in a vertical direction, the rotor blades provide lift for the helicopter, the fan is positioned around a base part of the body portion such that the fan does not intrude on space inside the body portion and on outlook from the body portion, and the fan rotates in use to generate a torque which acts to counteract at least a part of the torque generated by the rotor blades when they rotate, the rotor blades are in a plurality of vertical sets, each vertical set has its rotor blades mounted on one only of the spars, the spars rotate in use to cause the rotation of the rotor blades mounted on the spars, and the spars curve inwardly from the base part of the body portion to a top part of the body portion.