[See Through Model Rocket Engine Burning – 4K Slow Motion] (Viewer #53,795)
I’ll be honest, too much blah blah blah, so I jumped to the 1:40 mark to watch the burn. There’s a couple more burns after the first one, but watching them is up to you. I was pretty satisfied with the first one.

Mondo cool. I like that he did an unaltered engine in a clamp so you could see the delay and the parachute charge.
Now think about the fact that NASA does anchored burns on full-size rocket engines.
Videos like this make me glad I got a 4k screen.