Notice of retraction
Vol. 32, No. 8(2), S&M2292

ISSN (print) 0914-4935
ISSN (online) 2435-0869
Sensors and Materials
is an international peer-reviewed open access journal to provide a forum for researchers working in multidisciplinary fields of sensing technology.
Sensors and Materials
is covered by Science Citation Index Expanded (Clarivate Analytics), Scopus (Elsevier), and other databases.

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Development of Tailless Two-winged Flapping Drone with Gravity Center Position Control

Hiroto Nagai, Kazutaka Nakamura, Koki Fujita, Issei Tanaka, Shuji Nagasaki, Yutaka Kinjo, Shintaro Kuwazono, and Masahiko Murozono

(Received December 14, 2020; Accepted January 8, 2021)

Keywords: flapping wing, micro air vehicle, autonomous flight, biomimetics, flexible structure

We have developed a tailless, two-winged flapping drone with a full span length of 180 mm and a total weight of 20.5 g. The developed flapping drone is characterized by three biomimetic techniques: an anisotropic vein pattern reinforcing the wing surfaces, an elastic flapping mechanism, and gravity center position control in the abdomen. Based on experimental and numerical results, the flapping wings are reinforced by a vein pattern made of an anisotropic carbon fiber reinforced plastic (CFRP) laminate to passively provide appropriate aeroelastic deformation and positively utilize snap-though buckling on the wing surface at stroke reversals to provide a fast feathering rotation. The flapping wing kinematics are provided by a novel flapping mechanism with an energy recovery system using the elasticity of the mechanical system. Unlike other previously developed flapping robots, feedback control to stabilize the pitch and roll angles of the drone’s body is conducted using a technique of gravity center position control, where the tail angles of the body are changed similarly to the abdominal movements of insects in flight. The developed flapping drone has succeeded in an autonomous hovering flight for more than 30 s and a vertical take-off under a wireless condition with the gravity center position control.

Corresponding author: Hiroto Nagai




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