Empirical estimates of body drag of large waterfowl and raptors
Pennycuick CJ, Obrecht HH, Fuller MR. 1987. Empirical estimates of body drag of large waterfowl and raptors. The Journal of Experimental Biology. 135:253-264
Measurements of the body frontal area of some large living waterfowl (Anatidae) and raptors (Falconiformes) were found to vary with the two-thirds power of the body mass, with no distinction between the two groups. Wind tunnel measurements on frozen bodies gave drag coefficients ranging from 0·25 to 0'39, in the Reynolds number range 145000 to 462000. Combining these observations with those of Prior (1984), which extended to lower Reynolds numbers, a practical rule is proposed for choosing a value of the body drag coefficient for use in performance estimates.
- Type
- Journal Article
- Authors
- Pennycuick, C.; Obrecht, Holliday; Fuller, Mark
- Units
- ASIS
- Keywords
- assateague, Raptors, Waterfowl