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This picture shows the business
side of the propulsion system. There is:
- One propulsion tank, but there are a total of three - with
enough gas can be stored for multiple experiments.
- Propulsion electronics (wooden mass model - top left)
- The fill nozzle (top right, hard to see)
- Note that this has changed after the phase 0/1 safety review
- Two (2) regulators (running across the top) and 2 pressure
relief valves after the regulators (with red trim). This configuration
is the result of a design modification, due to concerns raised at the
Phase 0/1 safety review.
- LP plumbing across the bottom.
- One of the thruster clusters at the top left
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- Other hardware views showing mass models of the electronics, more
propulsion tanks and the aluminum battery box
- Dimensions: 17.5" cube Weight: ~77 lbs
- Composed of:
- 5052 Aluminum Honeycomb Panels
- CRES 303 Inserts, 7075T73 and 6061T6 L brackets,
10-32 A286 fasteners
- 120 Hz natural frequency verified by sine sweep and finite
element model
- Designed to withstand structural testing at 13.75 G's
simultaneously in all axes, within an operating temperature
range between -20C and 30C
- Complete Pro-E model for reference and stress analysis.
- Flight materials are in-hand and ready to be cut upon approval of
construction procedures.
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- Close up of the propulsion system showing the LP plumbing arriving
from the right
- There is a local latch valve that is used to isolate these three thrusters
- The thruster manifold is the aluminum block at the corner that mates
to the spacecraft frame
- There are 3 solenoids that operate each of the thruster valves (2
visible).
- All 12 thrusters have been tested and are currently being integrated
with the propulsion control board and the CPU.
- All flight parts have been acquired and are ready for assembly upon
approval of construction procedures
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- View of one of the three torquer coils. The one shown fits under the
top face
- The wooden blocks are mass models of other electronics that are included
for the shake tests of the EM
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- Current configuration of the Orion GPS receiver (more
details)
- The 2 receiver boards (three will be used for the flight model)
are stacked on top of the lower board that is used for the communication.
- This board has been extensively tested on the ground and with a signal
generator.
- The receiver is tightly integrated with the science
computer
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- One of the GPS antenna options that is under consideration
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- Torquer Coil control board - runs the coils and closes a simple feedback
loop using the magnetometer which is also shown
- Basic software to control the coil feedback loop has been written,
and is ready to be tested upon integrating the EM electronics.
- Made from simple and short-lead time materials, the flight parts are
either in-hand or will be easy to obtain. .
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- The spacequest computer that is used to handle the C&DH features.
- Baseline software is nearly complete and ready to be tested in the
complete systems integration.
- Some additional transmitters/receiver electronics are shown below:
 
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- The basic power distribution board.
- The design of the Solar cell layout is complete.
- The inhibit board that is required for the safety reasons is shown
below:
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