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Can the exhaust from the turbopump of a rocket engine be used for roll control if a rocket only has 1 engine? Did the falcon 1 rocket control roll this way?

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    $\begingroup$ What has your prior research shown you? $\endgroup$ Oct 27, 2023 at 0:13
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    $\begingroup$ The spin-stabilisation tag might not be appropriate. $\endgroup$
    – AJN
    Oct 27, 2023 at 7:53

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Yes.

From here(Wikipedia)

... while roll control is provided by a Hot gas Reaction Control Motor (HRCM) that ejects hot gases diverted from gas generator of Vikas engine.

Unfortunately, the source cited in the above article doesn't appear to be a valid link any more.

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