As we can see, in the first stage of Rocketlab's Electron the nozzles have small nozzle exit area.
Source (all)
But for second stage why are they using nozzle skirt/ extension with huge exit area?
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1$\begingroup$ More about the difference in the answers to: What are the differences between a standard Merlin engine and the Merlin Vacuum engine? $\endgroup$– uhohSep 21, 2018 at 8:51
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$\begingroup$ beautiful photos by the way, do you think you could add a link to the source? Thanks! $\endgroup$– uhohSep 21, 2018 at 14:30
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1$\begingroup$ @uhoh The link is medium.com/@JackKelleher/… $\endgroup$– AmarSep 22, 2018 at 8:42
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2$\begingroup$ Thanks! btw add = "edit question and add it there" Comments should really be considered temporary, so for anything important or possibly helpful, it should be added to the original post (either answer or question). I've added it now to save you the trouble. $\endgroup$– uhohSep 22, 2018 at 9:58
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