N-2 Rocket Motor Brief

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Introduction 

The N-2 Motor is designed to fly on the N-2 rocket to be launched in September. The rocket is set to target an altitude of 300m carrying a small payload. The motor is aimed to be reusable and accommodate different motor sizes from the length of 40mm(Test spec) to 270mm. The propellant to be used in the motor is also changeable. 

Basic Dimensions and Configurations

The propellant is free-standing with restricted burning on the walls with the grain being basically cylindrical. The motor is designed to fail in case of overpressurization in an axial direction. The three bulkhead bolts seized to shear at a pressure of approximately 16MPa, blowing off the bulkhead. The casing burst pressure is higher at around 80MPa. 

Nozzle

The nozzle is a conical shape machined from aluminium 6063. The convergent and divergent half angles are 350 and 120. The nozzle is attached with 4 M8 x 1.25 class 10.9 steel bolts with a minimum yield strength of 1040 MPa. Each bolt can withstand a minimum ultimate tensile load of 38,100N. This results in a safety factor of 3.05


Bulkhead

The bulkhead is machined from aluminium 6063. It is attached with 3 M8 x 1.25 class 10.9 steel bolts. Each bolt can withstand a minimum ultimate tensile load of 38,100N. This results in a safety factor of 2.29


Casing

The casing is also machined from aluminium 6063.  



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