Think you'd make a good Explainer? Find out how to apply here. The Museum reserves the right to delete inappropriate, irrelevant, or duplicate questions without notice.Ask an Explainer is designed to add to the content of the How Things Fly website, not to answer math problems. Before posting a question, please use the search tool to make sure your question has not already been asked.We will make every attempt to answer your question, but due to the volume of questions submitted we cannot guarantee your question will be answered. Or, search questions and answers submitted by other visitors below. How does an airplane bigger than a barn get off the ground? How do satellites stay in orbit? Do you have your own question? Ask an Explainer! They'll be happy to help you explore the world of flight. Pilots of high-altitude aerospace vehicles use flight Mach number to express a vehicle's true airspeed, but the flow field around a. At Mach 0.65, u is 65 of the speed of sound (subsonic), and, at Mach 1.35, u is 35 faster than the speed of sound (supersonic). PMID 19324747.Explainers work with Museum curators and educators to answer your most pressing questions about flight. By definition, at Mach 1, the local flow velocity u is equal to the speed of sound. Proceedings of the Royal Society B: Biological Sciences. "Flight costs of long, sexually selected tails in hummingbirds". 1 2 A close relative of the common swift, the white-throated needletail ( Hirundapus caudacutus ), is commonly reported as the fastest bird in level flight with a reported top speed of 169 km/h (105 mph).
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