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Geothermal Energy
Authors: Relly Victoria V. Petrescu and Florian Ion T. Petrescu Geothermal power requires no fuel (except for pumps), and is therefore immune to fuel cost fluctuations.
Read MoreMilitary aviation, Part II
Authors: Relly Victoria Virgil Petrescu and Florian Ion Tiberiu Petrescu
Read MoreFlight memories
Authors: RVV Petrescu and FIT Petrescu According to Aulus Gellius, Archytas, the Ancient Greek philosopher, mathematician, astronomer, statesman, and strategist, was reputed to have designed and built, around 400 BC, the first artificial, self-propelled flying device, a bird-shaped model propelled by a jet of what was probably steam, said to have actually flown some 200 metres. This machine, which its inventor called The Pigeon, may have been suspended on a wire or pivot for its flight.
Read MoreNACA and NASA, Part VII
Authors: Relly Victoria Virgil Petrescu and Florian Ion Tiberiu Petrescu
Read MoreAbout Helicopters
Authors: Relly Victoria Virgil Petrescu and Florian Ion Tiberiu Petrescu A helicopter is a type of rotorcraft in which lift and thrust are supplied by one or more engine-driven rotors. In contrast with fixed-wing aircraft, this allows the helicopter to take off and land vertically, to hover, and to fly forwards, backward, and laterally. These attributes allow helicopters to be used in congested or isolated areas where fixed-wing aircraft would not be able to take off or land.
Read MoreAircraft Carriers
Authors: Relly Victoria Virgil Petrescu and Florian Ion Tiberiu Petrescu
Read MoreWild Koala Day
Wild Koala Day is celebrated annually in May. It is an international event aimed at increasing awareness of the dangers that Wild Koalas face in Australia. Koalas natural habitats are being destroyed due to land clearance, bush fires and disease and its put them on the endangered species list for the first time.
Read MoreMachines and Robots Driven by Muscle Like Acting NiTi Alloys
The biomechanically inspired machine that is discussed in this paper refers to the antagonistic muscles pairs, which belongs to the Skeletal Muscles and are normally arranged in opposition so that as one group of muscles contract another group relaxes or lengthens.
Read MoreNACA and NASA, Part VI
Authors: Relly Victoria Virgil Petrescu and Florian Ion Tiberiu Petrescu
Read MoreNACA and NASA, Part I
Authors: Relly Victoria Virgil Petrescu and Florian Ion Tiberiu Petrescu
Read MoreNACA and NASA, Part III
Authors: Relly Victoria Virgil Petrescu and Florian Ion Tiberiu Petrescu
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