Back to bolts - but on the rocket not the text stand.
Mind you, on the figures, the stand would have gone next if the bolts holding the hooks in the rocket didn’t…..
Aftermath pictures.
Looks like it wasn't some clamp mechanism failure as there was no clamps in pic 1. More like the test stand latched onto the rocket body's v-shaped hooks (pic 3 and 4 have more details). Upon ignition, the 4 hooks that are part of the rocket body got sheared off cleanly.
So wasn't really the test stand fault as we initially thought - it was how those hooks attached to the rocket. Either bad / low-grade bolts gave away or they didn't do enough stress calculation/simulation?!
