This is a longer video that shows the start sequence of a Bristol Hercules engine and a bit of ground-running. They did encounter a small issue with a spring so the actual running doesn't start until 03:40. However, the footage up until that point has some interesting parts, so make sure to watch that as well.

This is probably our best video so far with a nice full frame view of the engine and its beautiful exhaust note coming right at us. Also note how the exhaust pipe goes from green to brown as it heats up.

Enjoy!