Get them excited about science with what exactly? The hypothesis that a bunch of bouncy balls dropped from altitude will bounce? Gee, ya think? What exactly was the scientific reasoning behind this? No, that's a serious question, please answer me. I mean besides blowing you Geek Club's entire budget for the year on 20k rubber balls, a helicopter rental, and the police detail ensuring you don't kill anyone by dropping falling objects from a flying machine, what did you accomplish here?
Would I be excited as a kid? Hell yes, the chance to grab free bouncy balls in any situation would excite me, but I'd see right through your thinly veiled disguise that this was a science project.