**Author details**

*Aerospace Engineering*

**4. Conclusions**

reduction in the price.

daily life.

of research" [57]. In general, the NewRocket concept seems to be such that can provide replacements for hydrazines in many types of applications, most notably as

The results of the firing tests of the proof-of-concept and development model systems demonstrate the capability to operate this technology in both pulses and steady modes and in various thrust levels. This bipropellant technology offers a promising alternative to the presently employed hydrazine-based systems, through the fact that the fuel and oxidizer show very robust hypergolicity and short ignition delay times, as well as characteristic velocity efficiency (*ηC*\*) exceeding 98%.

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

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

"green" replacement to the veteran bipropellants MMH and N2O4.

**22**

Dov Hasan1 \*, Dan Grinstein1 , Alexander Kuznetsov1 , Benveniste Natan1 , Zohar Schlagman2 , Avihay Habibi<sup>2</sup> and Moti Elyashiv2

1 Technion – Israel Institute of Technology, Haifa, Israel

2 NewRocket Ltd., Beer Sheva, 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, provided the original work is properly cited.
