I recently saw this video on YouTube featuring a jumping robot: 5 Fastest Robots In The World
I was curious how this is accomplished mechanically? Do they wind a strong spring or use some sort of air powered piston?
Looks like it uses a propane powered ram to launch itself into the air.
The end of the piston is visible in the back of the vehicle.
This webpage states that source of power is battery and propane
Also found this patent for a combustion powered linear actuator.