[HeyLaughingBoy]

Vehicle crash analysis for one.

There's an existing product called the SlamStick that's used to record high-shock/high-vibration environments. They released a paper on using one to find the source of a troubling vibration in a Navy helicopter. I came across them when doing research for a customer in the Vehicle Dynamics space.

It's one of those little niches that no one knows about and seems to support quite a few small companies.