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Keywords: dragonfly
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Journal Articles
Journal Articles
J Exp Biol (2018) 221 (19): jeb171199.
Published: 4 October 2018
...Csaba Hefler; Huihe Qiu; Wei Shyy ABSTRACT We investigated the characteristics of interwing aerodynamic interactions across the span of the high aspect ratio, flexible wings of dragonflies under tethered and free-flying conditions. This revealed that the effects of the interactions on the hindwings...
Includes: Supplementary data
Journal Articles
J Exp Biol (2014) 217 (19): 3447–3456.
Published: 1 October 2014
... this hypothesis in dragonflies by measuring the oxygen sensitivity of flight metabolic rates and behavior during hovering for 11 species of dragonflies that ranged in mass by an order of magnitude. We measured flight times and flight metabolic rates in seven oxygen concentrations ranging from 30% to 2.5...
Includes: Supplementary data
Journal Articles
J Exp Biol (2012) 215 (17): 3018–3027.
Published: 1 September 2012
... repeatable measurements of the reconstructed wing deformations. Using an Eastern pondhawk ( Erythimus simplicicollis ) dragonfly for demonstration, we quantify and visualize the wing twist and camber in both the chord-wise and span-wise directions, and discuss the implications of the results. In particular...
Includes: Multimedia, Supplementary data
Journal Articles
J Exp Biol (2008) 211 (2): 224–233.
Published: 15 January 2008
... ). Fig. 1. Schematic reconstruction of wake pattern during wake–wing interaction in fruit fly and dragonfly model wings. (A–D) Wake capture mechanism at dorsal and ventral stroke reversal. At the beginning of each half stroke, the leading and trailing edge vortex system generates an inter-vortex stream...
Journal Articles
Journal Articles
J Exp Biol (2005) 208 (19): 3785–3804.
Published: 1 October 2005
...Ji Kang Wang; Mao Sun SUMMARY The aerodynamics and forewing-hindwing interaction of a model dragonfly in forward flight are studied, using the method of numerically solving the Navier-Stokes equations. Available morphological and stroke-kinematic parameters of dragonfly ( Aeshna juncea ) are used...
Journal Articles
J Exp Biol (2004) 207 (26): 4707–4726.
Published: 15 December 2004
...Will J. Maybury; Fritz-Olaf Lehmann SUMMARY Insects flying with two pairs of wings must contend with the forewing wake passing over the beating hindwing. Some four-winged insects, such as dragonflies, move each wing independently and therefore may alter the relative timing between the fore...
Journal Articles
Journal Articles
Journal Articles
Journal Articles
J Exp Biol (2004) 207 (5): 767–776.
Published: 15 February 2004
... systems and non-biological systems is proportional to motor mass 1.0 . Here we trace the mechanisms that cause dragonflies to achieve a change from muscle mass 0.67 scaling of maximum force output by single flight muscles to mass 1.0 scaling of dynamic force output by the intact dragonfly flight motor...
Journal Articles
Journal Articles
Journal Articles
J Exp Biol (2000) 203 (20): 3125–3135.
Published: 15 October 2000
...Antonia B. Kesel ABSTRACT During gliding, dragonfly wings can be interpreted as acting as ultra-light aerofoils which, for static reasons, have a well-defined cross-sectional corrugation. This corrugation forms profile valleys in which rotating vortices develop. The cross-sectional configuration...
Journal Articles
J Exp Biol (1998) 201 (11): 1739–1744.
Published: 1 June 1998
... the sensitivity of flight initiation and metabolism to atmospheric oxygen level in the libellulid dragonfly Erythemis ( Mesothemis ) simplicicollis using flow-through res.pirometric measurements of the rate of CO 2 emission . Flight initiations were unimpaired in atmospheric oxygen levels as low as 10 %. However...
Journal Articles
Journal Articles
J Exp Biol (1997) 200 (3): 543–556.
Published: 1 February 1997
...J. M. Wakeling; C. P. Ellington ABSTRACT The free gliding flight of the dragonfly Sympetrum sanguineum was filmed in a large flight enclosure. Reconstruction of the glide paths showed the flights to involve accelerations. Where the acceleration could be considered constant, the lift and drag forces...
Journal Articles
J Exp Biol (1997) 200 (3): 557–582.
Published: 1 February 1997
...J. M. Wakeling; C. P. Ellington ABSTRACT The free flapping flight of the dragonfly Sympetrum sanguineum and the damselfly Calopteryx splendens was filmed in a large flight enclosure at 3000 frames s −1 . The wingtip kinematics are described for these flights. Despite the two species being similar...
Journal Articles
J Exp Biol (1997) 200 (3): 583–600.
Published: 1 February 1997
...J. M. Wakeling; C. P. Ellington ABSTRACT A mean lift coefficient quasi-steady analysis has been applied to the free flight of the dragonfly Sympetrum sanguineum and the damselfly Calopteryx splendens . The analysis accommodated the yaw and accelerations involved in free flight. For any given...