NDLI: Aerodynamic power and mechanical efficiency of bat airframes using a quasi-steady model

Content Provider	Springer Nature Link
Author	Bullen, R. D. McKenzie, N. L. Cruz Neto, A. P.
Copyright Year	2014
Abstract	Previous bat aerodynamic power models are refined by (1) varying the value of wing profile drag with lift coefficient, which varies with both flight speed and Reynolds number, (2) allowing for the aerodynamic cleanliness of head, body, ears and tail in calculating parasitic drag values at various speeds and according to airframe type, (3) incorporating models of wingbeat amplitude and frequency in the power calculations, and, (4) upgrading the allometric, phylogenetically corrected relationship between basal metabolic rate and body mass using data from 98 bat species. The fidelity of the aerodynamic power model is assessed using published wind tunnel data on a bat in steady glide. By comparing empirical published metabolic power (P $_{met}$) values with values derived using the new aerodynamic model, we update estimates of in-flight musculoskeletal mechanical efficiency (η) for the airframes of eight bat species at steady level flight speeds. Furthermore, we calculate the increase in η at high speeds. The bats assessed range in body mass from 0.01 to 1 kg, and the comparison covers the speed range normally used by free-flying bats during their excursions. At their best endurance flight speeds (V $_{end}$), η = 1.52 Ln (m $_{bat}$) + 11.44 (%). At speeds > V $_{end}$, η = η@ $_{ Vend}$ + 1.3 (V−V $_{end}$) (%). These equations yield accurate P $_{met}$ estimates for flight speeds within the range used for the steady level flight.
Starting Page	253
Ending Page	264
Page Count	12
File Format	PDF
ISSN	18695582
Journal	CEAS Aeronautical Journal
Volume Number	5
Issue Number	3
e-ISSN	18695590
Language	English
Publisher	Springer Vienna
Publisher Date	2014-03-26
Publisher Institution	Council of European Aerospace Societies
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Bat Flight Power Efficiency Mechanical Model Aerospace Technology and Astronautics
Content Type	Text
Resource Type	Article
Subject	Transportation Aerospace Engineering

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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