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Given the stage has the following configuration:

Thrust
  741.4 kN (Main)
   47.1 kN (Vernier)
Specific impulse
  297.999 s (Main)
  288.999 s (Vernier)

How would I calculate the total thrust and specific impulse for the stage?

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    $\begingroup$ Search for a recent question called "how does the rocket equation work when you have boosters", the answer gives the equation you need. Can't post link, on primitive device. $\endgroup$ Feb 15 '18 at 4:22
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    $\begingroup$ You add the two thrust numbers together. $\endgroup$ Feb 15 '18 at 4:41
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    $\begingroup$ @OrganicMarble I like the term "primitive device". I makes me think you are using a Timex Sinclair or a VT100 when in fact you are probably on something a hundred thousand times more powerful. $\endgroup$
    – uhoh
    Feb 15 '18 at 6:05
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    $\begingroup$ "I am endeavoring to construct a mnemonic memory circuit out of stone knives and bearskins" - Spock $\endgroup$ Feb 15 '18 at 11:15
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    $\begingroup$ @OrganicMarble Ha! I was thinking of precisely the same thing! Although I would never have been able to come up with more than the last four words. Fascinating. $\endgroup$
    – uhoh
    Feb 15 '18 at 15:00

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