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The question has already been asked here why no one has built a rocket to launch one CubeSat.

Here I'm asking about something sort of like SS-520, but commercial.

When I google the smallest rocket for launching satellites, at first all the results are about SS-520. But then I stumbled across Skylark Micro by accident. Is it the smallest rocket now?

Does anyone know about even smaller rockets?

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    $\begingroup$ I adjusted the formatting a bit and added link(s) to the question you mentioned. Can you take a look to see if this is still okay? $\endgroup$ – uhoh Jan 12 at 10:19
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    $\begingroup$ For a commercial success of this XXS rocket, the launch of one Cubesat only should be cheaper than a launch of only two or three CubeSats together using the smallest (and cheapest) multi CubeSat launcher. But you can't scale down all parts of small rockets with the same factor for weight and price. $\endgroup$ – Uwe Jan 12 at 13:51
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That particular page on their website is not very clear, but the "products" tab makes it a bit clearer, as does the Wikipedia summary: "Skylark Micro" is intended for suborbital launches. It is thus not in the same class as orbital launchers like the SS-520.

Skyrora are developing an orbital launcher, the "Skyrora XL". It is not yet in service, but the documentation they have published suggests it will be around 24m long with a fuelled mass of 56t, and a payload of around 2-300kg. This is substantially larger than the SS-520 - it is more comparable to something like the Electron or Falcon 1.

SS-520 was an engineering test to see if it could be done; the answer was "yes". It probably isn't the smallest rocket that could be built to do that job (though I'd be surprised if it was possible to make one much smaller) - but as the other question indicates, it's unlikely it would be commercially viable for most payloads.

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