A propeller related vehicle in accordance with one embodiment of the present invention is described as a helicopter having an airframe housing a motor mechanism for powering a main propeller attached to a main drive shaft that extends vertically through the airframe and for powering a tail rotor. The helicopter further includes a horizontal stabilizing mechanism attached between the main propeller and the main drive shaft, which permits the main propeller to freely pivot about the main drive shaft independently from the airframe. As such when the main propeller is rotating and the main propeller begins to pitch, the rotating main propeller has a centrifugal force created by the rotation thereof and will tend to pivot about the horizontal stabilizing mechanism in a manner that offsets the pitch such that the helicopter remains in a substantially horizontal position. In addition various main propeller configurations may be employed that provide additional self-stabilization.

Horizontal control of a toy flying vehicle intended for indoor hovering flight comprises providing the vehicle having a rotor and a separate remote controller for use by a player of the toy. The vehicle is airborne relative to the controller. A signal is sent from a transmitter with the toy to the controller. A variation in intensity of the received signal from the toy being effected in a horizontal plane of the controller. The controller is programmed to transmit a responsive signal to the toy according to the variation of intensity of signal received and thereby to cause the toy with the transmitter in the toy to move horizontally and to thereby retain the received signal in the horizontal direction of the controller at a first predetermined level.

In accordance with the invention, a flying machine is provided comprising at least two passive lift elements arranged substantially radial-symmetrically about a yaw axis of the flying machine, wherein the passive lift elements are configured to jointly generate a torque at the yaw axis upon movement of the flying machine substantially in parallel to the yaw axis. The flying machine further comprises active lift generating means, which are arranged substantially at distal ends of the passive lift elements.