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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.

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Military aviation, Part II

Authors: Relly Victoria Virgil Petrescu and Florian Ion Tiberiu Petrescu

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Nano Energy

Authors: Relly Victoria Virgil Petrescu and Florian Ion Tiberiu Petrescu

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Flight 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.

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NACA and NASA, Part VII

Authors: Relly Victoria Virgil Petrescu and Florian Ion Tiberiu Petrescu

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About 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.

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China Part I

Authors: FIT Petrescu and RVV Petrescu

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Aircraft Carriers

Authors: Relly Victoria Virgil Petrescu and Florian Ion Tiberiu Petrescu

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Wild 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.

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Machines 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.

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NACA and NASA, Part VI

Authors: Relly Victoria Virgil Petrescu and Florian Ion Tiberiu Petrescu

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Aviation History, Part I

Authors: Relly Victoria V. Petrescu and Florian Ion T. Petrescu

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NACA and NASA, Part I

Authors: Relly Victoria Virgil Petrescu and Florian Ion Tiberiu Petrescu

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V Engines Design

Authors: Florian Ion T. Petrescu and Relly Victoria V. Petrescu

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NACA and NASA, Part III

Authors: Relly Victoria Virgil Petrescu and Florian Ion Tiberiu Petrescu

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