Due to the existence of the fluid system and the rules of the FAR DPF challenge, I decided to design a Single Break Dual Deployment (SBDD) recovery system. The advantage of a SBDD system compared to other deployment systems is that I could use one deployment bay and still have two deployment events. 

The first deployment event occurs at apogee where the drogue is released with a black powder separation system. This event will pull out all the recovery gear and the main chute is retained by a deployment bag.  The second deployment event occurs at 1,000 ft. AGL where the main chute is deployed by releasing tender descenders slowing the rocket down to a safe landing velocity of 26 ft/s. In order to organize these events, I created the following lines diagram shown below to keep track of components and map out load paths. 

After calculating the worst case scenario from the opening shock force of the main chute, the bulkhead design began. Originally the bulkhead plate was designed to accommodate one eye bolt. However, it was discovered the opening shock forces were so great that the plate would have yielded which is suboptimal. Thus, with the addition of finding spare hoist rings in the lab, the bulkhead design was changed to accommodate two hoist rings that would distributed the load from the opening shock more effectively. A fiberglass tube was used as a deployment bay for the main chute and a black powder ejection system was chosen over a CO2 ejection system due to weight and reliability concerns. 

Wiring Separation Charges