9
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The first US two stage rocket was bumper, a combination of a german V2 liquid fuel rocket with an US second stage.
The Soviet Union had the R-1 and R-2 based on the V-2.
In this list, the R-7 is the first two stage rocket of the Soviet Union. Did they never try an experimental two stage rocket using the R-1 or R-2 as first stage?

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    $\begingroup$ R-7 is a "stage and a half" rocket; the sustainer core engines are lit at the same time as the boosters. I don't know if that changes your interpretation. $\endgroup$ – Russell Borogove Nov 30 '17 at 19:33
  • $\begingroup$ I know about the boosters of the R-7. You may describe the R-7 as a one and a half stage, but it is of course more than single stage. $\endgroup$ – Uwe Nov 30 '17 at 20:30
  • $\begingroup$ A variant of the R-7 family, the Luna had an additional stage which was lit in flight, not at launch pad. $\endgroup$ – Uwe Nov 30 '17 at 21:13
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    $\begingroup$ There was also a single staged R5 that had 1200 km range. From what I know it seems like R7 was the first project of the staged rocket... which was also the first ICBM project. Soviet rocket program was more restricted in resources and concentrated on urgent needs of military. So probably no experiments on R1, R2 and R5 was done as this neither is cost-effective for medium range rockets nor produces ICBM immediately. But that's just my guess. $\endgroup$ – OON Dec 4 '17 at 22:52
  • $\begingroup$ As this question stands, it is either too open-ended or not clear enough. If the question is list a number of the early two stage rockets, it's too broad. If the question is what is the history of Soviet Union's first two stage rocket, it's not really that clear. $\endgroup$ – PearsonArtPhoto Jan 10 '18 at 15:36

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