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For shallow water surface supply air diving, the diver's umbilical is typically a 3-part umbilical comprising a 3 ⁄ 8 inch (9.5 mm) bore breathing gas hose, 1 ⁄ 4 inch (6.4 mm) bore pneumofathometer ("pneumo") hose, and diver communications cable, which usually also serves as a lifeline strength member. The pneumo hose is open at the diver ...
A barb (or hose barb), which connects flexible hose or tubing to pipes, typically has a male-threaded end which mates with female threads. The other end of the fitting has a single- or multi-barbed tube—a long tapered cone with ridges, which is inserted into a flexible hose.
Thrust is generated by the propulsion system of the rocket through the application of Newton's third law of motion: "For every action there is an equal and opposite reaction". A gas or working fluid is accelerated out the rear of the rocket engine nozzle, and the rocket is accelerated in the opposite direction.
Liquid rocket fuel. Oxidizer. Pumps carry the fuel and oxidizer. The combustion chamber mixes and burns the two liquids. The hot exhaust is choked at the throat, which, among other things, dictates the amount of thrust produced. Exhaust exits the rocket.
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The criteria for acceptability of unflown rocket engines are: Option A. The engine has an article of at least Start class. The engine has been test fired, at least at the flight component or sub-scale level. The intent is for the rocket to be used in an orbital launch vehicle in the next five years. Examples: SCE-200 or Raptor (rocket engine ...
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