Differential pressure measurements offer a new approach for studying the aerodynamics of bird flight. Measurements from differential pressure sensors are combined to form a dynamic pressure map for eight sites along and across the wings, and for two sites across the tail, of pigeons flying between two perches. The confounding influence of acceleration on the pressure signals is shown to be smal...

As aircraft wings become much more flexible due to the use of light-weight composites material, adverse aerodynamics at off-design performance can result from changes in wing shapes due to aeroelastic deflections. Increased drag, hence increased fuel burn, is a potential consequence. Without means for aeroelastic compensation, the benefit of weight reduction from the use of light-weight materia...

Wing-assisted incline running (WAIR) is a form of locomotion in which a bird flaps its wings to aid its hindlimbs in climbing a slope. WAIR is used for escape in ground birds, and the ontogeny of this behavior in precocial birds has been suggested to represent a model analogous to transitional adaptive states during the evolution of powered avian flight. To begin to reveal the aerodynamics of f...

To improve the structure performances of minitype unmanned aerial vehicle (UAV) wing, numerical simulation and optimization design principle was carried out for designing the best composites wing structure. Thus tradeoff can be obtained between the general performance and the weight of the wing. Advanced composite material has its own outstanding features, such as high specific strength, high s...

In this study, the carcass and commercial cuts weights and yields in broilers of different ages fed diets supplemented with probiotics were determined. A total of 336 male broiler chicks (Ross-308) were randomly allocated into three treatment groups (P0, P1 and P2). A basal diet (P0), basal diet plus 0.01% (P1) and 0.02% (P2) probiotic (Saccharomyces cerevisiae, 4x10 8 cfu g -1 ) were offered t...

Since the taper ratio of most wings is not equal to 1, beam-disk trailing edge deflection mechanism originally designed for rectangular wing fully applicable non-equal chord wing. Moreover, it only expected that shape can achieve excellent aerodynamic performance under different flight conditions, but one also needs consider whether flexible skin this deformation. This paper used honeycomb comp...

2006). Flapping wing MAVs (FWMAVs) are a class of new conceptual MAVs that take design cues from flying insects in order to achieve a small size (<3–5 cm), high maneuverability and super remote ability (Yan et al. 2015). A FWMAV is expected to work in a variety of confined spaces such as urban canyons, caves, indoors, and jungles that large flying robots can’t be serviceable. To achieve such ta...

Ribs in aircraft wings maintain the airfoil shape of wing under aerodynamic loads and also support resulting bending shear that act on wing. Aircrafts are designed for least weight hence made hollow torsion box ribs with cut-outs to reduce structure. These will lead higher stresses stress concentration can failure structures. The depend thus present work, commercial software ANSYS was used eval...

Here, we present a detailed analysis of the take-off mechanics in droneflies performing voluntary take-offs. Wing and body kinematics of the insects during take-off were measured using high-speed video techniques. Based on the measured data, the inertia force acting on the insect was computed and the aerodynamic force of the wings was calculated by the method of computational fluid dynamics. Su...

Dolenec, Z.: Correlations between egg characteristics and laying order in the starling (Sturnus vulgaris) in NW Croatia. Nat. Croat., Vol. 10, No. 1., 11–17, 2001, Zagreb. This article analyses the effect of body weight and wing length of female starlings on clutch size as well as the effect of laying order on egg size. Egg length averaged 29.43 mm, egg breadth 21.32 mm, egg volume 6829 mm3, eg...