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The later, and much smaller Soviet BOR-4 was closer in design philosophy to the Dyna-Soar, [34] while NASA's Martin X-23 PRIME and Martin Marietta X-24A/HL-10 research aircraft also explored aspects of sub-orbital and space flight. [35] The ESA's proposed Hermes crewed spacecraft was superficially similar to but not derived from the X-20.
Number built. 38 (Sept 2023) [1] The Ruppert Archaeopteryx (English: ancient wing) is a Swiss high-wing, pod-and-boom, single-seat, microlift glider that was designed by Roger Ruppert and is produced by Ruppert Composite GmbH. [2][3] The aircraft is named for the feathered Archaeopteryx dinosaur that lived during the Late Jurassic Period in ...
Classification of dinosaurs. Dinosaur classification began in 1842 when Sir Richard Owen placed Iguanodon, Megalosaurus, and Hylaeosaurus in "a distinct tribe or suborder of Saurian Reptiles, for which I would propose the name of Dinosauria." [1] In 1887 and 1888 Harry Seeley divided dinosaurs into the two orders Saurischia and Ornithischia ...
Titanoboa (/ ˌtaɪtənəˈboʊə /; lit. 'titanic boa') is an extinct genus of giant boid (the family that includes all boas and anacondas) snake that lived during the middle and late Paleocene. Titanoboa was first discovered in the early 2000s by the Smithsonian Tropical Research Institute who, along with students from the University of ...
Other rebbachisaurid features include the rather simple ("attenuated") structure of the neural spine and the respective inclinations of the centrodiapophyseal lamina and the postzygodiapophyseal laminae. Maraapunisaurus is a genus of sauropod dinosaur from the Late Jurassic Morrison Formation of western North America.
Origin of avian flight. The Berlin Archaeopteryx, one of the earliest known birds. Around 350 BCE, Aristotle and other philosophers of the time attempted to explain the aerodynamics of avian flight. Even after the discovery of the ancestral bird Archaeopteryx which lived over 150 million years ago, debates still persist regarding the evolution ...
The RC-3 Seabee was designed by Percival Hopkins "Spence" Spencer. An aviation pioneer who first soloed in a powered airplane in 1914, he designed the Spencer S-12 Air Car Amphibian. Construction of the S-12 began on March 1, 1941 and the small, two-seat S-12 prototype, registered NX29098, made its first flight on August 8, 1941.
Psittacosaurus (/ ˌsɪtəkəˈsɔːrəs / SIT-ə-kə-SOR-əs; " parrot lizard ") [1] is a genus of extinct ceratopsian dinosaur from the Early Cretaceous of what is now Asia, existing between 125 and 105 million years ago. It is notable for being the most species -rich non-avian dinosaur genus.