uncleflo
Registered since September 28th, 2017
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Basic of Space Flight: Rocket Propellants
Saved by uncleflo on September 2nd, 2014.
Propellant is the chemical mixture burned to produce thrust in rockets and consists of a fuel and an oxidizer. A fuel is a substance that burns when combined with oxygen producing gas for propulsion. An oxidizer is an agent that releases oxygen for combination with a fuel. The ratio of oxidizer to fuel is called the mixture ratio. Propellants are classified according to their state - liquid, solid, or hybrid. The gauge for rating the efficiency of rocket propellants is specific impulse, stated in seconds. Specific impulse indicates how many pounds (or kilograms) of thrust are obtained by the consumption of one pound (or kilogram) of propellant in one second. Specific impulse is characteristic of the type of propellant, however, its exact value will vary to some extent with the operating conditions and design of the rocket engine.
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Ug carbon carbon composite
Saved by uncleflo on May 29th, 2014.
What are Carbon-Carbon Composites? Amorphous carbon matrix composite Carbon matrix reinforced by graphitic carbon fibers First developed in 1958, but not intensively researched until the Space Shuttle Program
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Reinforced carbon–carbon - Wikipedia, the free encyclopedia
Saved by uncleflo on May 29th, 2014.
Carbon fibre-reinforced carbon (aka carbon–carbon, abbreviated C/C) is a composite material consisting of carbon fiber reinforcement in a matrix of graphite. It was developed for the nose cones of intercontinental ballistic missiles, and is most widely known as the material for the nose cone and wing leading edges of the Space Shuttle orbiter. It has been used in the brake systems of Formula One racing cars since 1976; carbon–carbon brake discs and pads are a standard component of Formula One brake systems.
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Carbon-Carbon
Saved by uncleflo on May 29th, 2014.
The combination of carbon or graphite fibers in a carbon or graphite matrix produces a material with unusual properties called a carbon-carbon composite. They are fabricated by multiple impregnation of porous "all carbon" frames or configurations which are then impregnated with a liquid carbonizable precursor (e.g., pitch) and pyrolyzed. Carbon-carbon composites can also be produced by chemical vapor deposition of pyrolytic carbon. The main advantages of carbon-carbon composites are their retention of useful properties up to 2760 °C (5000 °F). A foamed carbon-carbon composite has also been fabricated.
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Eurotunnel: Faster Than A Ferry To France - Folkestone Dover to Calais
Saved by uncleflo on January 3rd, 2013.
Taking your car to the Continent offers you complete travel independence and lets you take control. We are the fastest cross-channel operator, with a crossing time of just 35 minutes, so you arrive on the Continent quicker than you think. Our fare structures also offers you good value, giving you cheaper fares when you plan ahead and travel at quieter times. Up to 4 departures per hour. Motorway to motorway access. 1 ticket covers 1 car and up to 9 passengers. No baggage restrictions or fuel supplements.
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