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It's simply a device that emits fluid in such a manner that there's no net force. Simple example, a T-shaped pipe where gas travels up the stem of the T and exits out both sides of the top bar. A propulsion example: Shuttle would dump excess propellant by firing opposing pairs of RCS jets. Shuttle's flash evaporator had vents on opposite sides of the aft ...


A non propulsive vent is an object designed to redirect venting gases into two opposing directions, such that the propulsive effects cancel each other out. Here is a link to a photo of one use on ISS.


The equation you listed above is greatly simplified and fails to account for additional elements such as the spacecraft surface area exposed to the sun. Assuming you calculate solar radiation pressure as the following: $$ F_\mathrm{s}=\frac{\phi }{c}$$ Where: $c$ = speed of light $\phi$ = Solar constant at your distance from the sun My Recommendation ...


On the ground, assuming a free-standing rocket, the force required stabilising the rocket is gravity. To tip, the rocket needs to rotate about the point(s) of contact with the ground. This will involve raising the rocket's centre of mass -- the wider the base, the higher it'll need to be lifted, so the more stable the rocket will be. In flight, stability (...

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