Questions about Elevator Specifics

[ttldomination]

So, I've been doing a little research in elevators and such, and given the recent RAMP video, this sparked a little bit of interest (which lead to confusion) about some of the finer details about elevator systems.

For continuous elevators, why is it that one of the drums needs to be twice the size of the other (if the system is powered up and down)?

For cascade systems, I'm a little perplexed as to how the cascade affects the forces and speeds of the elevator. On some CD posts, they say that you need more force to power a cascade system?

I'd appreciate any input,
- Sunny G.