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The sustainer nozzle assembly is intended to be used on Phoenix 1, attached to the sustainer stage. It is made of two components, the nozzle carrier and graphite nozzle, which are joined together with high-temp RTV sealant. The assembly is then joined to the motor case using twelve 10-32 thread, 7/16" long countersunk bolts. The nozzle is sealed into the case using three o-rings, two on the graphite nozzle, and one on the nozzle carrier. The purpose of these O-rings is to keep the hot gases from combustion inside the chamber and prevent exhaust leakage and therefore an inefficient and possibly dangerous burn. To calculate the o-ring gland size, we used this website: https://www.applerubber.com/oring-gland-calculator/
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Nozzle Basic dimensions:
Throat Diameter: 0.8 in
Exit Diameter: 3 in
Throat Length: 0.1 in
Convergent Angle: 60 degrees
Divergent Angle: 15 degrees
Parts:
Part Name | Material | Purpose | Manufacturing Equipment | Team member | Progress |
|---|---|---|---|---|---|
3 in Nozzle | Graphite | The graphite has a high melting point, and is able to absorb most of the heat from combustion, and forms the throat of the nozzle. | Lathe | ||
| 3 in Nozzle Carrier | Aluminum 6061 | Houses the other three parts, and is the bolt connection point to the motor case and the rest of the rocket. It also forms the back half of the divergent section, bringing the expansion ratio up to make sure the exit pressure matches ambient pressure | Lathe; Radial Indexer on Mill |
Drawings:
Graphite Sustainer Nozzle Nozzle Carrier
Manufacturing tips
General Tips:
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