Patent Number: 6,293,492

Title: Coaxial twin-rotor type helicopter

Abstract: A one-man helicopter 1 in which a drive transmission 10 that transmits driving force to upper and lower rotors 5 and 6 comprises first and second planet gear mechanisms 100 and 200 provided with a common carrier 104. When the common carrier 104 is rotated by a motor 301, a differential motion is generated between the two planet gear mechanisms. This results in the rotors being rotated at different velocities, which can be used to control yaw. A fore-and-aft swing mechanism 400 and right-and-left swing mechanism 500 depend from the lower end of a vertical shaft 41 on which the rotors are supported. Moving a stick 8 forward or backward, or to either side, tilts the vertical shaft 41 in the same direction. When the stick 8 is not subjected to a controlling force, the vertical shaft 41 reverts automatically to its original vertical state. This configuration makes it possible to realize a coaxial twin-rotor type helicopter having a compact, structurally simple control mechanism.

Inventors: Yanagisawa; Gennai (Nagano-ken, JP)

Assignee: Engineering System Co., Ltd.

International Classification: B64C 27/10 (20060101); B64C 27/52 (20060101); B64C 27/00 (20060101); B64C 027/52 ()

Expiration Date: 09/25/2018