They have a demo video showing a helicopter catching a booster dropped from a second helicopter: https://www.youtube.com/watch?v=N3CWGDhkmbs https://www.youtub

They have a demo video showing a helicopter catching a booster dropped from a second helicopter: https://www.youtube.com/watch?v=N3CWGDhkmbs https://www.youtube.com/watch?v=N3CWGDhkmbs (from https://www.rocketlabusa.com/launch/electron/ https://www.rocketlabusa.com/launch/electron/ ) The parachuting booster falls at 10 meters per second from 6000 meters, so they've got a pretty tight window. The helicopter has a ceiling of 4300 meters and can cover about 3 km a minute, so you've got a couple minutes after the chute deploys to get to the closest safe distance when the booster is still above the helicopter and then about 5 minutes to catch it once the helicopter is above it.