| Summary: | 碩士 === 國立臺灣大學 === 動物學系 === 84 === The flight speeds and kinematic parameters of three Chinese
bulbuls (Pycnonotus sinensis) (No. 1, 2, 3) were recorded.
Using these data, and their morpholigical parameters, I
estimated the power consumptions of these three birds at flight
with the use of aerodynamic theory. The wingbeat frequency and
amplitude did not change with flight speeds and among
individuals. The body inclination angle decreased with the
increasing flight speed and there existed a simple linear
relationship. I suggest that the Chinese bulbuls may change
their flight speeds simply by changing their body inclination
angle. When flying at slow speed, the induced power of the bird
was about 80% of its mechanical power requirements. The profile
and parasite power were about 5% of mechanical power. At fast
flight, the induced power was about 50% of its mechanical power
requirements and the proportion of profile and parasite power
in mechanical power were about 30%. As the induced power is
concerned with the life generation and the profile and parasite
power is concerned with the drag, I suggested that at slow
flight most of the power expenditure is used to lift
generation. But at high speed, 50% of its power expenditure is
used to lift generation and another 28% to 30% is used to
overcome the drag. The inertial power was 15% to 17% of its
mechanical power at slow flight and 22.6% to 27% at fast
flight. I suggest that the inertial power should not be ignored
in the calculation of power consumption of flight. If the
mechanical efficiency of flight muscle is assumed between 0.08
and 0.23, the possible range of flight metabolic rate could be
7.12 to 18.40 times of basal metabolic rate at slow flight and
4.57 to 11.08 times of BMR at fast flight.
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