Download 1000 Things You Should Know About Ancient History by John Farndon PDF

By John Farndon

This e-book presents a wealthy source of knowledge wih greatest influence and minimal muddle. one thousand proof are lined through a hundred issues, every one with 10 key issues that supply an easy yet memorable deal with at the topic. attention-grabbing info panels in addition to prolonged captions enlarge this quickly hearth technique.

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2-27 inflates approximately 60 percent. A reefing line is then cut to allow 80 percent inflation. At 2835 meters (9300 feet) altitude, a second reefing line is cut to allow full canopy inflation. A second signal from the barometric switch activates an ordnance train at 2012 meters (6600 feet) altitude, detonating a 360" shaped charge around the ordnance ring and separating the frustum from the booster. The three main parachutes then deploy out of the base of the frustum and the frustum continues its descent attached to the drogue parachute.

5 tons) of insulation are applied inside the motor. 0 inches), depending on the time of exposure to the hot gases. Most of the insulation consists of a material called nitrile butadiene rubber (NBR), which has been used in previous rocket motors. The insulation is applied in sheets that stick together and that are laid down in such a way that the insulation adheres to an adhesive that has been applied to the inside of the case walls. 5 hours. After cooling, the insulation becomes a solid material firmly bonded to the case wall.

Tank pressurization pushes fuel out of the tanks much like squeezing air out of a balloon. The External Tank is jettisoned 10 to 15 seconds after Orbiter main engine cutoff. At separation, the ET tumble system is activated. The tumble system prevents aerodynamic skip during reentry, ensuring that tank debris will fall within the preplanned disposal location in the Indian Ocean. The tumble system is initiated by the firing of a 5centimeter (2-inch) pyrotechnic valve by the separation signal. The valve, located in the nose cap, releases the pressurized gas from the liquid oxygen tank, causing the ET to spin at a minimal rate of 10 deg/s.

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