Overview

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The Aurora motor was retained using forward and aft retention rings. The forward retention ring was comprised of two components. The inner portion of the FRR sat inside the motor case, preventing the motion of the forward closure. The outer portion of the FRR was bolted through the airframe and inner portion of the FRR, centering the motor in the airframe. The aft retention ring was designed to bolt through the motor case and nozzle carrier, eliminating the need for extra bolts. It was also designed to match with the boattail on the nozzle carrier, transitioning between the airframe and nozzle.

Requirements

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1. Connect the motor to the mission package tube
2. Hold the forward closure in place
3. Withstand forces with a FoS of at least 2
   1. (forces on bottom face? forces on lip? depends on design choices, mass above frr, and bolt selection/pattern) 
   2. From ppt:
      1. Withstand F_up upward force (on bottom face)
      2. Withstand F_down downward force (on lip)

Anticipated Maximum Forces

1. Upward Forces
   
   1. Derived from anticipated maximum internal pressure and surface area of the FC 
2. Downward Forces
   1. Derived from summing g-force and drag maximums
3. Min FoS Upward: 
4. Min FoS Downward: 
5. FEA (Max Displacement):

Design Meeting 10/13

1. Using the Prometheus Forward Retention Ring as a reference to design the Aurora Forward Retention Ring
2. Adjusting the design to fit the new 5 inch diameter motor
3. Brainstorming methods to create this diameter transition geometry and how to fit the fiberglass rocket case around the motor

Current Working Sketch

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