| 11. | AMROC developed the largest hybrid rockets ever created in the late 1980s and early 1990s.
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| 12. | HTPB is also used as a hybrid rocket fuel.
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| 13. | Environmental Aerospace Corporation ( eAc ) was incorporated in 1994 to develop hybrid rocket propulsion systems.
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| 14. | The hybrid rocket engine design was dropped in favor of a cluster of Orbitec's Vortex engines.
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| 15. | Several hybrid rockets have been successfully launched so far, reaching altitudes of 10 ~ 20 km.
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| 16. | ONERA, based in France, and Volvo-Flygmotor, based in Sweden, developed sounding rockets using hybrid rocket motor technology.
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| 17. | These could have included multi-pulse rocket motors, thrust vectoring, hybrid rockets, gel propellants, and ductless external combustion ramjets.
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| 18. | The polyamide hybrid rocket motor is a modified version of the polybutadiene version, with different oxidizer valve arrangement.
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| 19. | Nitrous oxide can be used as an oxidizer with various fuels; it is popular mainly in hybrid rockets.
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| 20. | Liquid systems enable higher specific impulse than solids and hybrid rocket engines and can provide very high tankage efficiency.
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