Path Forward
Want to replicate deployment forces from Hermes I: 2018-07-21-serial-5102-flight-0002.eeprom
Need to write detailed test procedure, better logging of tests, and better understanding of COTS altimeters.
Likely test will be to attach lines like in deploy, and drop onto lines in BC using a load cell (not just altimeter accelerations).
Structures Next Steps:
1. All nuts should be epoxied in on back side, or otherwise somehow fastened on better (maybe locking nuts). Almost all the bolts were loose after the three drops.
2. Need the heat set inserts in the top 3D printed piece so we can appropriately fasten the structure to the payload bulkhead.
3. Rebuild structure.
4. Make parts for at least 2 more AV towers, maybe 3. Consider adding more bolts to attach to payload bulkhead.
5. Figure out a way to fasten fireflies from the top, and keep SD cards in.
Avionics Next Steps:
1. Learn to better get data from COTS altimeters, i.e. better control of turning them off and on.
2. Attach screw switches so we can test these.
3. Check that COTS altimeters programming is correct, mostly unsure about Marsa main setting.
4. Finish cameras so we can test these.
5. (Low priority) better connections for pyros connecting to Pyxida (NOT NEEDED FOR HERMES III)
Shake Test 1
First attempt:
Dropped from around waist height
Acceleration: 5 m/s^2
Second attempt:
dropped from around shoulder height
Acceleration: 18 m/s^2
Christmas light fell out
Third attempt:
- Slammed the entire structure down
- Whole AV tower broke
- Measured 50 gs on Marsa, 70 m/s^2 on Telemega (Hermes I saw 140 m/s^2 max acceleration)
- These numbers seem fishy/not a great test
Notes overall:
All nuts were loose afterwards
SD card came out
Firefly camera turned on
Used the 6061 non-optimized payload bulkhead
Used ground test MP tube (NOT flight)
Received telemetry the whole time
Had continuity before and after test
Images of aftermath below:
side view:
SD card popped out of firefly:
broken piece of AV tower
