AH! I think that's what I was trying to remember. My teacher showed me how to make the movement of one object determine the movement of another, by making a pod racer engine set that is manipulated by the pilot seat model.
Yeah so I'm not looking at replicating the function just yet as I haven't built the winch that winds it up underneath, and if I make it wrap a cord around it I will need a shit tonne of divisions and IK joints. No. lol.
Hmm here's a YouTube of the one I actually work at, so you get an idea of the process.
You see, the pin slides in and pinches the ride, and then as the cords pull, the ride is tilted back because it's torn between the inertia of the pin and the elastic of the cords, lifting the rest of the ride up and tilting it. THen as the cords stretch they near the top of the towers and nest into a port when they reach maximum stretch. At that point it's released and BAM. So I'm looking to:
confine the capsule ride to the ground and then remove that rule as soon as the cords touch the very top, and then send it rocketing about 10 metres past the towers. I just need to know the names of some of the actions to be used.