I can point you guys in the right direction but I want to ask you first what Gravity means and what it will do to this planet. What you seek changes every aspect of life. This doesn't just give you a flying car. What gravity does in space is something you might not be ready for. Once you learn how gravity works it explains the ever expansion we see and can't explain by the big bang, you lose the Biggs boson because you also find out where gravity is being birthed. Another issue that arrives is once you find out what it takes to make gravity you discover there are already devices in existence that are banned by your planet. In a perfect world this would be great but what we don't live there. Shutting down ever coal, oil, and gas factory in the world is not that great of a thing. We're talking hundreds of thousands of lives being sacrificed if you do this wrong. Sending the world back to the dark ages basically because of a colapse in the social and economic structure. You ever wonder for a species that's as old as our with evidence of the past having tech we desire why we don't have this stuff today?