Just read the servo specs, it should tell you the output torque in ounces per inch, and most should tell you how fast it can move.
Im guessing its safe to say the best way to figure out what youre going to need is by trial and error, start with a standard size servo and take it from there.
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Im guessing its safe to say the best way to figure out what youre going to need is by trial and error, start with a standard size servo and take it from there.