There's a wonderful article at Kernel Magazine in which Jeremy Wilson meets the fracking protestors:
Have you protested before on energy issues?
Prajna: “Well, no. But I’ve designed a few energy things. I’ve designed an internal combustion engine that only has two moving parts, which is far too efficient to produce, otherwise oil companies would kill me. I’ve had some top engineers working on it. My great uncle designed a perpetual motion machine. But he was busy looking for something that would insulate between magnets in order to produce it. Well actually I’ve had a look at the design since. I looked into buoyancy. I did all the maths on buoyancy.