Related: How do single engine rockets control roll?

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While many single-nozzle motors are gas generators & can deflect the pump exhaust asymmetrically to produce a torque, staged combustion motors cannot. For rockets like Zenit and Atlas V, which have multiple nozzles, this is no problem. However, rockets using a single nozzle staged combustion engine, such as the Naro-1 & Angara (RD-191), Soyuz-2-1v (RD-193), and similar, how is roll authority provided?

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    $\begingroup$ I'll point you to this answer. While the question was about attitude, the answer also addresses roll. Similar controls can be seen on one of the rockets you mentioned, the Soyuz-2-1v, which use RD-0110R as Vernier thrusters. $\endgroup$ – Das_Geek Feb 26 '20 at 22:01
  • $\begingroup$ A modified 0110 is used as veriners??? I need to see a diagram or something because I have NO clue how that would look. Did they just cut out the -0110 turbopump veriner system and weld it around the -193? $\endgroup$ – Anton Hengst Feb 26 '20 at 22:08
  • $\begingroup$ @neph kosmonavtika.com/lanceurs/soyouz/version/14A15/fig1-1.jpg $\endgroup$ – Organic Marble Feb 26 '20 at 22:51
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    $\begingroup$ @OrganicMarble new SpaceForce! policy $\endgroup$ – uhoh Feb 27 '20 at 0:47
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    $\begingroup$ The problem with these kinds of questions is that one will not get a complete answer. ITAR, along with its equivalents in Europe, Russia, China, and India, is stupid in many ways, but there it is, and it is there, accompanied with threats of lengthy amounts of jail time. $\endgroup$ – David Hammen Feb 27 '20 at 3:42

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