Purpose
The Hermes Propulsion system Rumbler is responsible for boosting the vehicle to Mach 3 and 80,000 ft. The motor is lit by an ignition train a pyrotechnic initiator at T-0 and burns out around 7 8.2 seconds later at 2112,000 ft.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. | |
| 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: 7970,110 000 Ns (93% 71% P)
Propellant: Ocean Water
Average thrust: 10,749 N8560 N
Motor designation: P-107498560
Propellant mass: 6468.89 12 lbs
Delivered ISP (approximate): 274 227 s
Nozzle throat dia: 1.758 in655 in
Nozzle exit dia: 5.38 in49 in
Expansion ratio: 911.370
Burn time: 78.36 19 s
Max chamber pressure: 850759.7 9 psi
Testing
Component Level Testing
- Characterization Static Fire #5
- Characterization Static Fire #6
- Hydrostatic Testing - Pending