Gene and I looked at a variety of claims. As I recall, the only one that seemed solid was Hydrodynamics. If it is real, I assume it is connected with sonofusion, which Stringham and others have worked on.
I do not know of any reason to doubt those claims, but they were not widely replicated and the percent of excess heat was no high, so I can't be sure it is real. As I recall it was typically 5 to 7%, occasionally 15%. That is, 115% of input. However, it should have been well below 100% since the gadget was radiating enough heat to kill a person, and that heat was not accounted for. I will say, they had the most beautiful industrial scale calorimetry I have ever seen, or heard of. Most industrial scale calorimetry is crude but this was splendid. The system was designed by the Dean of Mechanical Engineering at Georgia Tech. I gather he was floored with it showed excess heat. I never heard what happened after that. I don't think he signed off on the result. The people at Hydrodynamics stopped looking for excess energy long ago. They don't want to deal with it. It is trouble for them. I can well understand why. - Jed
