Experimental investigation of a new spiral wingtip

Abstract

Experiments on the relative merits and demerits of slotted wingtips mimicking a bird’s primary feathers have been performed. The real emargination length of feather tips, their flexibility and curved shapes during cruise are considered in the present study. The experiments were performed at a Reynolds number of 3.7 x 105 on a symmetric flat plate half wing of aspect ratio 3. Lift, drag and pitching moments were measured using a six component aerodynamic balance. Four different shapes inspired by bird primary feathers have been analysed. The rigid curved tip performed the best increasing the L/D ratio by 20%. This improvement has been compared with forty different wingtips model available in the literature which shows that rigid curved tip provide better L/D performance. Based on this improvement the key performance indicator of Jet and propeller airplane has been calculated that shows a 7.8% and 9% increase in range for propeller and Jet airplane, respectively.

Authors

• Siddiqui, Naseeb Ahmed Embry-Riddle Aeronautical University
• Aldheeb, Mohammed Embry-Riddle Aeronautical University
• Asrar, Waqar Embry-Riddle Aeronautical University
• Sulaeman, Erwin Embry-Riddle Aeronautical University

Keywords

• Aerodynamics; Biomimetic Wing Tips; Wind tunnel force balance
• Aerodynamics and Fluid Mechanics
• Aeronautical Vehicles
• Applied Mechanics
• Cosmology, Relativity, and Gravity
• Space Vehicles
• The Sun and the Solar System