| 1. | It can be dangerous to use upper-stage engines in normal single-stage rockets.
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| 2. | In 1924, Tsiolkovsky also wrote about multi-stage rockets, in'Cosmic Rocket Trains '.
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| 3. | Then last August, North Korea launched a three-stage rocket over Japan.
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| 4. | January's accident was blamed on a turbo-pump failure freezing the third-stage rocket motor.
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| 5. | In 1939, Merkulov did further ramjet tests using a two-stage rocket, the R-3.
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| 6. | The Blue Scout I was a three-stage rocket derived from the Scout X-1.
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| 7. | The Meteor 3 was a two-stage rocket, developed from Meteor 1.
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| 8. | Kistler is developing a two-stage rocket to lift satellites into space.
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| 9. | Conrad, plans an expendable two-stage rocket with a new engine design.
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| 10. | Aspects of the first single-stage rocket were assigned to each student.
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