computeBodyFrontalArea {afpt} | R Documentation |
Body frontal area is a parameter that relates to body drag. This function estimates body frontal area based on empirical scaling relations with mass.
computeBodyFrontalArea(massEmpty, type = "other")
massEmpty |
empty body mass (in kg) |
type |
type of bird; available options are: “passerine” and “other”) |
Passerine (Hedenström and Rosén 2003): Sb = 0.0129 * m^0.614
Other (Pennycuick et al. 1988): Sb = 0.00813 * m^0.666
Numeric value for the body frontal area.
Body frontal area is used for the computation of body drag. Only use this value if it matches the used definition of the body drag coefficient.
Marco Klein Heerenbrink
Pennycuick, C. J., Obrecht III, H. H. and Fuller, M. R. (1988) Empirical estimates of body drag of large waterfowl and raptors. J. Exp. Biol. 135, 253–264.
Hedenström, A. and Rosén, M. (2003) Body frontal area in passerine birds. J. Avian Biol. 34, 159–162.
massEmpty <- 0.215 # kg Sb <- computeBodyFrontalArea(massEmpty) print(Sb) # [1] 0.002920751 # m2 massEmpty <- 0.215 # kg birdType <- "passerine" # Sb <- computeBodyFrontalArea(massEmpty,birdType) print(Sb) # [1] 0.005020037 # m2