Effect of slotted wing tips on yawing moment characteristics

Sachs, Gottfried; Moelyadi, Mochammad Agoes

doi:10.1016/j.jtbi.2005.07.016

Cited by 29 publications

(22 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It was found that the bird with slotted (unclipped) wing tips had a drag of 70-90% of the drag of the bird with clipped wing tips. The value of induced drag factor was 0.56 for unclipped birds compared to 1.10 for clipped feather birds (US7900876 B2, 2007;Lockwood, Swaddle, & Rayner, 1998;Norberg, 2012;Sachs & Moelyadi, 2006;Swaddle & Lockwood, 2003). Such results are also reported by various other researchers (US7900876 B2, 2007; Lockwood, Swaddle, & Rayner, 1998;Norberg, 2012;Sachs & Moelyadi, 2006;Swaddle & Lockwood, 2003).…”

supporting

confidence: 78%

“…The value of induced drag factor was 0.56 for unclipped birds compared to 1.10 for clipped feather birds (US7900876 B2, 2007;Lockwood, Swaddle, & Rayner, 1998;Norberg, 2012;Sachs & Moelyadi, 2006;Swaddle & Lockwood, 2003). Such results are also reported by various other researchers (US7900876 B2, 2007; Lockwood, Swaddle, & Rayner, 1998;Norberg, 2012;Sachs & Moelyadi, 2006;Swaddle & Lockwood, 2003). Whitcomb (1976) developed the concept of winglets, to reduce induced drag, followed by the development of blended winglet, spiroid winglet, grid winglet, wingtip sail, and wingtip blowing with different modifications within them to improve the aerodynamic behaviour of aircraft (Siddiqui et al, 2017).…”

mentioning

confidence: 94%

See 1 more Smart Citation

Experimental investigation of a new spiral wingtip

Siddiqui¹,

Aldeeb²,

Asrar³

et al. 2018

IJAAA

View full text Add to dashboard Cite

supporting

confidence: 78%

mentioning

confidence: 94%

Experimental investigation of a new spiral wingtip

Siddiqui¹,

Aldeeb²,

Asrar³

et al. 2018

IJAAA

View full text Add to dashboard Cite

“…Although there is minor separation between the tips of the primaries in IVPP V13156, the presence of slotted wing tips is difficult to determine. Slotted wing tips are typical of broad-winged soaring birds, which aid in reducing drag during soaring [24,25] and may improve stability while gliding [26]. Reconstructions of a heavily forested environment surrounding the lake(s) of the Lower Cretaceous Jehol Group (e.g., [27,28]) implies Confuciusornis required more maneuverability and stability than speed in flight.…”

Section: Discussionmentioning

confidence: 99%

Laser Fluorescence Illuminates the Soft Tissue and Life Habits of the Early Cretaceous Bird Confuciusornis

et al. 2016

View full text Add to dashboard Cite

In this paper we report the discovery of non-plumage soft tissues in Confuciusornis, a basal beaked bird from the Early Cretaceous Jehol Biota in northeastern China. Various soft tissues are visualized and interpreted through the use of laser-stimulated fluorescence, providing much novel anatomical information about this early bird, specifically reticulate scales covering the feet, and the well-developed and robust pro- and postpatagium. We also include a direct comparison between the forelimb soft tissues of Confuciusornis and modern avian patagia. Furthermore, apparently large, fleshy phalangeal pads are preserved on the feet. The reticulate scales, robust phalangeal pads as well as the highly recurved pedal claws strongly support Confuciusornis as an arboreal bird. Reticulate scales are more rounded than scutate scales and do not overlap, thus allowing for more flexibility in the toe. The extent of the pro- and postpatagium and the robust primary feather rachises are evidence that Confuciusornis was capable of powered flight, contrary to previous reports suggesting otherwise. A unique avian wing shape is also reconstructed based on plumage preserved. These soft tissues combined indicate an arboreal bird with the capacity for short-term (non-migratory) flight, and suggest that, although primitive, Confuciusornis already possessed many relatively advanced avian anatomical characteristics.

show abstract

“…The induced drag factor ranges from 0.7 to 0.96 at lift coefficients of 1.2-1.6. Sachs and Moelyadi (2006) concluded that sweep inside the wing tip provides a significant contribution to yawing moment and stability. The aerodynamic forces and pressure distribution were measured by revolving dried pigeon wing and a flat card replica.…”

Section: Bird Feather Tip For Drag Reduction Researchmentioning

confidence: 99%