Several years ago I read that this concept was used to test new aircraft structure and engine designs. There were several projects like it in the late 1920s and 1930s which avoided treaty restrictions.
Shawn and Sally Harrison
- Modeling 1850s B&O
Like this one?

This is the rocket sled at NAWC-WD China Lake CA. I've been there a couple times.
An earlier test shot of an S-3 ejection sequence.

Man, I'm glad I never had to get THAT ride.
