scholarly journals Aerodynamic characteristics of flying fish in gliding flight

2010 ◽  
Vol 213 (19) ◽  
pp. 3269-3279 ◽  
Author(s):  
H. Park ◽  
H. Choi
Keyword(s):  
Aerodynamic Characteristics ◽  
Flying Fish ◽  
Gliding Flight

Aerodynamics of Gliding Flight in a Falcon and Other Birds

1970 ◽  
Vol 52 (2) ◽  
pp. 345-367 ◽  
Author(s):  
VANCE A. TUCKER ◽  
G. CHRISTIAN PARROTT
Keyword(s):  
Wind Tunnel ◽  
High Performance ◽  
Lift Coefficient ◽  
Aerodynamic Characteristics ◽  
Wing Span ◽  
Technical Errors ◽  
Gliding Flight ◽  
Air Speed ◽  
D Values ◽  
D Value

1. A live laggar falcon (Falco jugger) glided in a wind tunnel at speeds between 6.6 and 15.9 m./sec. The bird had a maximum lift to drag ratio (L/D) of 10 at a speed of 12.5 m./sec. As the falcon increased its air speed at a given glide angle, it reduced its wing span, wing area and lift coefficient. 2. A model aircraft with about the same wingspan as the falcon had a maximum L/D value of 10. 3. Published measurements of the aerodynamic characteristics of gliding birds are summarized by presenting them in a diagram showing air speed, sinking speed and L/D values. Data for a high-performance sailplane are included. The soaring birds had maximum L/D values near 10, or about one quarter that of the sailplane. The birds glided more slowly than the sailplane and had about the same sinking speed. 4. The ‘equivalent parasite area’ method used by aircraft designers to estimate parasite drag was modified for use with gliding birds, and empirical data are presented to provide a means of predicting the gliding performance of a bird in the absence of wind-tunnel tests. 5. The birds in this study had conventional values for parasite drag. Technical errors seem responsible for published claims of unusually low parasite drag values in a vulture. 6. The falcon adjusted its wing span in flight to achieve nearly the maximum possible L/D value over its range of gliding speeds. 7. The maximum terminal speed of the falcon in a vertical dive is estimated to be 100 m./sec.

scholarly journals Simulation Analysis of the Aerodynamic Performance of a Bionic Aircraft with Foldable Beetle Wings in Gliding Flight

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Caidong Wang ◽  
Yu Ning ◽  
Xinjie Wang ◽  
Junqiu Zhang ◽  
Liangwen Wang
Keyword(s):  
Simulation Analysis ◽  
Simulation Method ◽  
Aerodynamic Characteristics ◽  
Aerodynamic Performance ◽  
Elastic Model ◽  
Flight Performance ◽  
Flexible Wings ◽  
Gliding Flight ◽  
Drag Ratio ◽  
Gliding Movement

Beetles have excellent flight performance. Based on the four-plate mechanism theory, a novel bionic flapping aircraft with foldable beetle wings was designed. It can perform flapping, gliding, wing folding, and abduction/adduction movements with a self-locking function. In order to study the flight characteristics of beetles and improve their gliding performance, this paper used a two-way Fluid-Structure Interaction (FSI) numerical simulation method to focus on the gliding performance of the bionic flapping aircraft. The effects of elastic model, rigid and flexible wing, angle of attack, and velocity on the aerodynamic characteristics of the aircraft in gliding flight are analyzed. It was found that the elastic modulus of the flexible hinges has little effect on the aerodynamic performance of the aircraft. Both the rigid and the flexible wings have a maximum lift-to-drag ratio when the attack angle is 10°. The lift increased with the increase of the gliding speed, and it was found that the lift cannot support the gliding movement at low speeds. In order to achieve gliding, considering the weight and flight performance, the weight of the microair vehicle is controlled at about 3 g, and the gliding speed is guaranteed to be greater than 6.5 m/s. The results of this study are of great significance for the design of bionic flapping aircrafts.

Influence of Microstructures on Aerodynamic Characteristics for Dragonfly Wing in Gliding Flight

2019 ◽  
Vol 16 (3) ◽  
pp. 423-431 ◽  
Author(s):  
Sheng Zhang ◽  
Masayuki Ochiai ◽  
Yuta Sunami ◽  
Hiromu Hashimoto
Keyword(s):  
Aerodynamic Characteristics ◽  
Dragonfly Wing ◽  
Gliding Flight

Numerical prediction of aerodynamic performance for a flying fish during gliding flight

2019 ◽  
Vol 14 (4) ◽  
pp. 046009 ◽  
Author(s):  
Jian Deng ◽  
Lingxin Zhang ◽  
Zhiyou Liu ◽  
Xuerui Mao
Keyword(s):  
Aerodynamic Performance ◽  
Numerical Prediction ◽  
Flying Fish ◽  
Gliding Flight

Effect of Micro Structure on Dragonfly Wings on Aerodynamic characteristics during Gliding Flight

2017 ◽  
Vol 2017 (0) ◽  
pp. E-03
Author(s):  
Akira YOKOYAMA ◽  
Hisayoshi NAKA ◽  
Yuta SUNAMI ◽  
Masayuki OCHIAI ◽  
Hiromu HASHIMOTO
Keyword(s):  
Aerodynamic Characteristics ◽  
Micro Structure ◽  
Gliding Flight ◽  
Dragonfly Wings

Flying Fish- The Way It Has Done

2014 ◽  
Vol 1 (2) ◽  
Author(s):  
Pushpakumara Sanjeewa
Keyword(s):  
Flying Fish ◽  
The Way
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