A recent test flight failure of SpaceX’s Starship has been attributed to an unexpected harmonic response, which led to increased stress on the propulsion system and ultimately caused the rocket to explode before reaching space. According to a statement from SpaceX, the upper stage experienced a stronger-than-expected resonance, putting additional strain on its engines.
During the January 17 launch, the Super Heavy booster’s Raptor engines fired successfully, but a low-power condition in one engine’s igniter system forced it to prematurely shut down. However, the other 12 engines worked fine. The issue was previously identified and rectified for future flights by upgrading the igniter system.
The main problem arose with the Starship’s second stage, where two flashes were observed near the Raptor vacuum engines, indicating a pressure rise indicative of a leak. Fires broke out in the attic, leading to multiple engine shutdowns and loss of communication with the ship. The vehicle was observed to break apart during descent.
An investigation into the incident, launched by SpaceX and overseen by the FAA, revealed that while contact was lost with the ship, the Autonomous Flight Safety System triggered autonomously and breakup occurred within expectations. The debris fell within the pre-planned Debris Response Area, with no hazardous materials present.
The Starship test failure has highlighted the complexities of rocket development. Despite several modifications made to the design following previous test runs, including changes to fuel feed lines and propellant temperatures, more work needs to be done to iron out kinks in the system. The next scheduled test launch is set for February 28, with the updates addressing some of the issues identified in this incident.
Source: https://gizmodo.com/spacex-wraps-up-probe-into-starship-failure-that-scattered-debris-over-vacation-spots-2000568153