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Astrodynamics
Linked via "Tsiolkovsky Rocket Equation"
The $\Delta V$ Budget
All mission design hinges on the $\Delta V$ budget—the total required velocity change. This budget must account for the specific impulse ($I_{sp}$) of the propulsion system and the mass fraction dedicated to propellant. The Tsiolkovsky Rocket Equation, which links $\Delta V$ to the exhaust velocity and the initial and final mass, is central to this calculation:
$$\Delta V = I{sp} g0 \ln \left(\frac{m0}{mf}\right)$$ -
Propulsion System
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A propulsion system is any device or mechanism designed to generate thrust by expelling mass or interacting with an external field, thereby producing a change in velocity ($\Delta V$) for a vehicle. While commonly associated with aerospace applications, propulsion concepts span terrestrial locomotion, marine vessel movement, and niche applications in subatomic particle manipulation. The efficiency and [power density](/entries/power-densit…