Helicopter landing on ship in rough weather
A while back I came across the RAST helicopter landing and handling system that gets used on Navy ships. Then yesterday I'm watching a show about the Sinop-D, an ancient shipwreck in the Black Sea, and their underwater robots have mechanical arms equipped with force feed-back, so the operator can tell, just by how much the controls resist, how much effort the machine is exerting.
So this goes into my brain and today I get this idea for ships that carry helicopters. What they need is a landing platform that is mounted on a robotic arm that can compensate for the pitch and roll of the ship. That way it can provide a nice, stable landing platform for a helicopters even in recalcitrant weather. Once the chopper is secured to the platform, the platform can gradually step away from being stable and back to being locked to the ship with all it's unpleasant gyrations.
Building something like this that would support multi-ton helicopter from a storm tossed ship would be a bit of a trick. Nothing really new, just bigger and faster and more sensitive than anything we've got now.