منابع مشابه
Thermal soaring flight of birds and unmanned aerial vehicles.
Thermal soaring saves much energy, but flying large distances in this form represents a great challenge for birds, people and unmanned aerial vehicles (UAVs). The solution is to make use of the so-called thermals, which are localized, warmer regions in the atmosphere moving upward with a speed exceeding the descent rate of birds and planes. Saving energy by exploiting the environment more effic...
متن کاملSoaring and non-soaring bats of the family pteropodidae (flying foxes, Pteropus spp.): wing morphology and flight performance.
On oceanic islands, some large diurnal megachiropteran bat species (flying foxes; Pteropus spp.) frequently use thermal or slope soaring during foraging flights to save energy. We compared the flight morphology and gliding/soaring performance of soaring versus non-soaring Pteropus species, one pair on American Samoa and one pair on the Comoro Islands, and two other soaring/flap-gliding species ...
متن کاملHow Cheap Is Soaring Flight in Raptors? A Preliminary Investigation in Freely-Flying Vultures
Measuring the costs of soaring, gliding and flapping flight in raptors is challenging, but essential for understanding their ecology. Among raptors, vultures are scavengers that have evolved highly efficient soaring-gliding flight techniques to minimize energy costs to find unpredictable food resources. Using electrocardiogram, GPS and accelerometer bio-loggers, we report the heart rate (HR) of...
متن کاملDynamic Soaring in Hurricanes
The potential for a gliding UAV to sustain flight by dynamically soaring in a hurricane is investigated. Leveraging extensive storm observations, the wind profile of the hurricane eye is modeled as a continuous function that is zero at the center and increases as a power of the radius. We then derive the equations of motion for a UAV flying in this wind field, and prove analytically that if the...
متن کاملFlight responses by a migratory soaring raptor to changing meteorological conditions.
Soaring birds that undertake long-distance migration should develop strategies to minimize the energetic costs of endurance flight. This is relevant because condition upon completion of migration has direct consequences for fecundity, fitness and thus, demography. Therefore, strong evolutionary pressures are expected for energy minimization tactics linked to weather and topography. Importantly,...
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ژورنال
عنوان ژورنال: Aeronautical journal (London, England : 1897)
سال: 1912
ISSN: 2398-1873,2397-9291
DOI: 10.1017/s2398187300700387