As we can see, in the first stage of Rocketlab's Electron the nozzles have small nozzle exit area.
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But for second stage why are they using nozzle skirt/ extension with huge exit area?
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1More about the difference in the answers to: What are the differences between a standard Merlin engine and the Merlin Vacuum engine? – uhoh Sep 21 '18 at 08:51
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beautiful photos by the way, do you think you could add a link to the source? Thanks! – uhoh Sep 21 '18 at 14:30
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1@uhoh The link is https://medium.com/@JackKelleher/the-tiny-electron-rocket-is-getting-ready-to-fly-again-fb81846a765e – Amar Sep 22 '18 at 08:42
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2Thanks! 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. – uhoh Sep 22 '18 at 09:58