The pterostigma of insect wings an inertial regulator of wing pitch

  title={The pterostigma of insect wings an inertial regulator of wing pitch},
  author={R. {\AA}ke Norberg},
  journal={Journal of comparative physiology},
  • R. Norberg
  • Published 2004
  • Biology
  • Journal of comparative physiology
1. The pterostigma of insect wings usually is a pigmented spot close to the leading edge far out on the wing, having a greater mass than an equally large wing piece in adjacent wing regions. 2. In several dragonfly (Odonata) species the position of the spanwise torsion axis of the wings, the mass distribution of the wings, and the position of the chordwise centre of mass in chordwise wing strips were determined. 3. In the dragonflies investigated, the torsion axis of the wing lies ahead of the… Expand

Figures and Tables from this paper

Wing-pitching mechanism of hovering Ruby-throated hummingbirds.
A computational analysis of the pitching dynamics by incorporating the realistic wing kinematics to determine the inertial effects shows that like many insects, pitch reversal of the hummingbird is, to a large degree, caused by the wing inertia. Expand
Passive wing pitch reversal in insect flight
Wing pitch reversal, the rapid change of angle of attack near stroke transition, represents a difference between hovering with flapping wings and with a continuously rotating blade (e.g. helicopterExpand
The effects of corrugation and wing planform on the aerodynamic force production of sweeping model insect wings
The effects of corrugation and wing planform (shape and aspect ratio) on the aerodynamic force production of model insect wings in sweeping (rotating after an initial start) motion at Reynolds numberExpand
On the vein-stiffening membrane structure of a dragonfly hind wing
Aiming at exploring the excellent structural performance of the vein-stiffening membrane structure of dragonfly hind wings, we analyzed two planar computational models and three 3D computationalExpand
Kinematics of Dragonfly ( Sympetrum flaveolum ) Flight
The kinematics of the flapping flight of the dragonfly Sympetrum flaveolum is investigated. The flapping patterns of the hindwing are recorded and studied thoroughly using a high speed video cameraExpand
Wing inertia as a cause of aerodynamically uneconomical flight with high angles of attack in hovering insects
  • H. Phan, H. Park
  • Computer Science, Medicine
  • Journal of Experimental Biology
  • 2018
It is shown that, although elastic elements may be involved in flight muscles to store and save energy, the insect still has to use substantial power to accelerate its wings, because inertial energy stores should be used to overcome aerodynamic drag before being stored elastically. Expand
Basal Complex and Basal Venation of Odonata Wings: Structural Diversity and Potential Role in the Wing Deformation
The first three-dimensional (3D) finite element (FE) models of the proximal part of the wings of typical representatives of five dragonflies and damselflies families are developed, revealing that although both the basal venation and the basal complex influence the structural stiffness of the Wings, it is only the latter which significantly affects their deformation patterns. Expand
The damping and structural properties of dragonfly and damselfly wings during dynamic movement
It is shown that different wing regions have almost identical damping properties, and the mean damping ratio of fresh wings is noticeably higher than that previously thought, in the first systematic study of insect wing damping. Expand
The Role of Soft Vein Joints in Dragonfly Flight
Dragonflies are excellent flyers among insects and their flight ability is closely related to the architecture and material properties of their wings. The veins are main structure components of aExpand
Kinematic control of aerodynamic forces on an inclined flapping wing with asymmetric strokes.
The present study suggests that manipulating the angle of attack during a flapping cycle is the most effective way to control the aerodynamic forces and corresponding power expenditure for a dragonfly-like inclined flapping wing. Expand


Aspects of Flight Mechanics in Anisopterous Dragonflies
1. Movements of the wings and pterothorax of Aeshna spp. have been studied by stroboscopic observation combined with the cutting of certain muscles. 2. There is a constant phase difference betweenExpand
Energetics of Hovering Flight in Hummingbirds and in Drosophila
It is argued that the tilt of the stroke plane relative to the horizontal is an adaptation to the geometrically unfavourable induced wind and to the relatively large lift/drag ratio seen in many insects. Expand
This report is based on the study of CCl4-treated flies and outlines the main features of the mechanics of wing movement and the secret of the peripheral control of wing rate certainly lies in the indirect flight muscles. Expand
Resilin. A Rubberlike Protein in Arthropod Cuticle
Resilin is a structural protein, which was discovered recently as a major constituent of certain elastic hinges and tendons in the cuticle of locusts and dragonflies, and lends itself more easily to studies of the rubberlike state in proteins, the number and nature of cross-links, and the formation of three-dimensional networks in biological structures. Expand
A Rubber-Like Protein in Insect Cuticle
It is shown that resilin is a structure protein in which the primary chains show little or no tendency to form secondary structures; they are bound together in a uniform three-dimensional network (the tertiary structure) with no potential limits as to size. Expand
The wings of insects and birds as mechanical oscillators
  • Prec . Amer . phil . Soc .
  • 1960
Trae-og bladhvepse (Hymenoptera phytophaga)
  • Danmarks Fauna 18
  • 1960
Principles of helicopter engineering
The effect of wing inertia on the wing - stroke frequency of moths , dragonflies and cockroach
  • Principles of helicopter engineering
  • 1955