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    Someone is definitely going to lose a finger/arm/head hanging around that thing.

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      People who mess around with exposed engines on test stands are familiar with those kinds of hazards, and (usually) operate them in controlled environments (garages), where catastrophic failure is a calculated risk. Full scale afterburner tests probably represent the extreme end of this, but here’s an example of a hobbyists small scale mock up:

      https://www.youtube.com/watch?v=WHEHMFbEH8I

      Here’s a full-scale afterburner test:

      https://www.youtube.com/watch?v=Oj4w7i-TqsE