Purpose
The Hermes Propulsion system is responsible for boosting the vehicle to Mach 3 and 80,000 ft. The motor is lit by a pyrotechnic initiator at T-0 and burns out 7.4 seconds later at 12,600 ft.
Requirements
The following requirements are set out in the DTEG for the propulsion system.
| Requirement | Description | Component | Compliance |
|---|---|---|---|
| 2.1 | Non-Toxic Propellants | APCP listed as non-toxic | |
| 2.2 | Arming Functionality | TBD | |
| 2.2.1 | Arming interrupt during pad ops | TBD | |
| 2.4 | SRAD Testing Compliance | Local Authorities and landowner permission secured. Complying with Applicable NFPA, ATF, and DoHS regulations. | |
| 2.4.1 (4.2) | Pressure Vessel Testing | Design to 2 MAWP, proof test to 1.5 MAWP. Compliance incomplete | |
| 2.4.3 | Successful Static Fire Test | TBD | |
| 6.2.3 | Coupler Length | Forward Retention Ring | Exemption Obtained |
| 6.3 | RF Window | Booster | Exemption Obtained |
Design
Impulse: 65,000 Ns (70% P)
Propellant: Ocean Water
Average thrust: 8200 N
Motor designation: P-8200
Propellant mass: 68.12 lbs
Delivered ISP (approximate): 212 s
Nozzle throat dia: 1.650 in
Nozzle exit dia: 5.03 in
Expansion ratio: 9.29
Burn time: 7.36 s
Max chamber pressure: 839.9 psi
Testing
Component Level Testing
- Characterization Static Fire #5
- Characterization Static Fire #6
- Hydrostatic Testing - Pending