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The Journal of Experimental Biology 205, 2737-2744 (2002)
© 2002 The Company of Biologists Limited

Fluid-dynamic characteristics of a bristled wing

S. Sunada1,*, H. Takashima2, T. Hattori2, K. Yasuda2 and K. Kawachi3

1 National Institute of Industrial Science and Technology, Ministry of Economy, Trade and Industry, 1-2-1 Namiki, Ibaraki 305-8964, Japan
2 Nihon University, 7-24-1 Narashinodai, Funabashi, Chiba 274-0081, Japan
3 Research Center for Advanced Science and Technology, University of Tokyo, 4-6-1 Komaba, Meguro, Tokyo 153-8904, Japan

* Author for correspondence at present address: Osaka Prefecture University, 1-1 Gakuen-cho, Sakai, Osaka 599-8531, Japan (e-mail: sunada{at}aero.osakafu-u.ac.jp)

Accepted 6 June 2002

Thrips fly at a chord-based Reynolds number of approximately 10 using bristled rather than solid wings. We tested two dynamically scaled mechanical models of a thrips forewing. In the bristled design, cylindrical rods model the bristles of the forewing; the solid design was identical to the bristled one in shape, but the spaces between the `bristles' were filled in by membrane. We studied four different motion patterns: (i) forward motion at a constant forward velocity, (ii) forward motion at a translational acceleration, (iii) rotational motion at a constant angular velocity and (iv) rotational motion at an angular acceleration. Fluid-dynamic forces acting on the bristled model wing were a little smaller than those on the solid wing. Therefore, the bristled wing of a thrips cannot be explained in terms of increased fluid-dynamic forces.

Key words: thrips, Thripidae frankliniella, bristled wing, membranous wing, fluid-dynamics, constant-velocity translation/rotation, accelerating translation/rotation


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© The Company of Biologists Ltd 2002