You are viewing an old version of this page. View the current version.
Compare with Current
View Page History
Version 1
Next »
| Failure | Supporting Evidence | Detracting Evidence | Probability | Notes |
|---|
| Boost Phase Piston Deployment | - Vehicle separated
- Piston Actuated
| - TeleMega data shows good voltage on both pyro channels until T+11s
| Eliminated | |
| Fin Flutter | - Initial Fin failure at root
- Fin stiffness not measured prior to flight
| - All fin failures happen at the root
- Analysis shows flutter velocity >>> M3
| Moderate | It'd be awesome if we could find a fin |
| Fin Shear | - Initial fin failure at root
- Fin Analysis was a known analysis weak point
- Flight Article not tested
| - Very, very positive margins for design case
| Highly Likely | It'd be awesome if we could find a fin |
| Fin Thermal Weakening | - Thermal environment is known to be above working temperature of epoxy system
- Flight article not tested
| - Remaining carbon fiber on fin can does not show evidence of thermal damage
| Moderate | It'd be awesome if we could find a fin This may be a contributing factor to other failure modes |
| Fin Tip Disbond | - Flight article not tested
| - Very positive test margins
| Low | It would have been fricking amazing if we found the fins |
| Asymmetric Nozzle Failure | - Nozzle insert is missing
- Nozzle carrier step exhibited significant erosion
| - Successful static fire
- Can this produce enough of an asymmetric force to cause the observed dynamics?
| Moderate | P-Tap data on the LE DAQ can retire this failure mode, or further indict it. |
| Wind Shear | - Observed vehicle dynamics align with the vehicle clearing mountain ranges around FAR
| - Forecast and NAS China Lake report low winds
| Low | May have been a contributing factor in a compound failure See Therion 3 Postflight Report |
| Fin Can below spec | - We have literally no composite quality standard
- We did not test the flight article
- We have literally no quantitive indications that the fin can was built to drawing
| | Highly Likely | Interlaminar shear strength could be degraded by dust contamination Fin Can sanding may have abraded through critical layers of carbon tip to tip |
| Coning | - This vehicle was all over the place on TeleMega data
| | Highly Likely | We need to understand when coning happens and check the data. |
| Nose Cone Collapse | | | Moderate | Nose cone not recovered |