After Artemis I returned to Earth, large chunks of the Orion capsule's AVCOAT heat shield separated during reentry, grounding future crewed missions until NASA understood why. YouTuber polymatt replicated the shield's segmented architecture using NASA's published filler material specs, inserted thermocouples into each cured sample, and fired a propane torch at them to simulate reentry heat loads.
The results confirmed NASA's own failure analysis: sustained pyrolysis inside the ablative material builds up gases that fracture the structure from within. Polymatt flags one experimental flaw, copper supports in the test rig introduced residual heat, but the core finding held regardless, and the setup still functions as a credible DIY ablative heat shield test bench.
The piece worth reading is not the conclusion but the materials sourcing and sample fabrication process, specifically how closely a hobbyist can replicate flight-grade ablative composition from open NASA documentation. That gap between public spec and actual performance is where this project gets interesting.
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