Numerically, what is the approximate loss of overall system specific impulse associated with pressure-fed rocket engines, not only as a result of the low chamber pressure but also of the additional tank weight? This is obviously a bit awkward to calculate as the volume of fuel doesn't scale linearly with the surface area of the tank, but even if your answer could include just a rough estimate, that would be really helpful.

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    $\begingroup$ The tank weight doesn't affect specific impulse. (Well, it affects system specific impulse, but that's a rarely-mentioned figure.) $\endgroup$ – Russell Borogove Sep 25 '20 at 5:08
  • $\begingroup$ "Loss" relative to what? $\endgroup$ – Organic Marble Sep 25 '20 at 11:32

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