Using a long, steep ramp to launch rockets could theoretically reduce fuel consumption, but the practicality is questionable. The ramp would need to be extremely steep, making vertical takeoff more efficient. Accelerating a rocket on a ramp for 10-20 seconds could allow for a smaller, cheaper rocket or increased payload capacity. However, this approach introduces significant complexity and requires a suitable geographic location, such as a large mountain. Overall, while the concept has potential, it is unlikely to be worthwhile compared to traditional vertical launches.
