**4. Conclusions**

With the advent of the "green" or reduced hazards propellants, suitable replacements for the veteran propulsion systems based on hydrazines have been identified. For introduction of new technologies to the very conservative field of space propulsion, the methods presented here offer both continuity in technical concept and reduction in the price.

For the catalytically activated hydrazine monopropellant, a concept has been developed of a dual system for which the decision for actual propellant to be used, whether veteran or comparable "green" propellant, can be delayed. Thus, a smooth technological transfer is enabled, without use of specific high-cost components.

For hypergolically activated bipropellants, a system development has been presented that uses, instead of the risky MMH and N2O4, a kerosene-based fuel and hydrogen peroxide oxidizer. Both are nontoxic and in common inexpensive usage in daily life.

**23**

**Author details**

Zohar Schlagman2

Dov Hasan1

provided the original work is properly cited.

\*, Dan Grinstein1

2 NewRocket Ltd., Beer Sheva, Israel

, Avihay Habibi<sup>2</sup>

1 Technion – Israel Institute of Technology, Haifa, Israel

\*Address all correspondence to: mereagh@technion.ac.il

© 2019 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium,

, Alexander Kuznetsov1

and Moti Elyashiv2

, Benveniste Natan1

,

*Green Comparable Alternatives of Hydrazines-Based Monopropellant and Bipropellant Rocket…*

*DOI: http://dx.doi.org/10.5772/intechopen.82676*

*Green Comparable Alternatives of Hydrazines-Based Monopropellant and Bipropellant Rocket… DOI: http://dx.doi.org/10.5772/intechopen.82676*
