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.
Scholarly Commons Citation
Siddiqui, N. A.,
Experimental investigation of a new spiral wingtip.
International Journal of Aviation, Aeronautics, and Aerospace,
Aerodynamics and Fluid Mechanics Commons, Aeronautical Vehicles Commons, Applied Mechanics Commons, Cosmology, Relativity, and Gravity Commons, Space Vehicles Commons, The Sun and the Solar System Commons