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Performance evaluation was carried out for the 70 N-class hyd razine thruster whose design performance had been already verified. The pulse-mode firing te st was conducted for the development model thrusters with various thrust chamber diameters. Evaluati on was made by the performance parameters such as specific impulse, impulse bit, and characteristic velocity, etc: specific impulse and characteristic velocity were deteriorated as the thrust chamber diameter deviates from a standard model. Consequently, it is revealed that the performance characteristics of standard model is most superior among the test models.    70 N      .          , ,       .        ,        .Key Words:Space Launch Vehicle(), Attitude Control System(), Hydrazine Thruster( ), Characteristic Length(), Pulse-mode()Received 2 October 2013 / Revised 9 January 2014 / Accepted 13 January 2014

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Test &amp; Evaluation for the Configuration Optimization of Thrust Chamber in 70 N-class N<sub>2</sub>H<sub>4</sub>Thruster (Part I: Pulse-mode Performance According to the Chamber Diameter Variation)

Test & Evaluation for the Configuration Optimization of Thrust Chamber in 70 N-class N2H4Thruster (Part I: Pulse-mode Performance According to the Chamber Diameter Variation)

Test & Evaluation for the Configuration Optimization of Thrust Chamber in 70 N-class N₂H₄Thruster (Part I: Pulse-mode Performance According to the Chamber Diameter Variation)