This fellow posted this at there forum. Apparently, he is a physicist or engineer.
And he apparently said:
Because the Steorn engineers knew bugger all about magnetism so they were not inhibited by incorrect theory.
Fusion research is being directed by physicists and their theory of magnetism doesn't allow for the fact that it is pinned to the Gamma-atmosphere frame of reference, the inertial frame of reference, and will be affected both by the rotation of the earth on its axis and the orbiting of the earth around the sun.
Danger! Danger Will Robinson!
The claim that scientists are "bound" by their models and therefore cannot see the amazing discoveries is a very commonly cited one for people making amazing claims without a lot of evidence to back them up.
Sadly, it completely flies in the face of scientific reality. Scientific and mathematical modeling is always open to reinterpretation and change. If you think scientists wouldn't dare contemplate the revision of the laws of physics, you don't know any scientists. They would simply require fairly convincing experimental evidence that those laws required revision.
Why? Because those laws are very well supported by existing evidence, and you don't just toss such things out because some guy says so. You wait for some evidence to back the claims up.
Does that make you a slave to scientific orthodoxy? No, it does not.
Claims that scientists missed something because they were "inhibited by incorrect theory" should immediately raise red flags. Although there are always scientists who are more stubborn than others, any scientist worth their degree would change their mind when provided with evidence. Evidence, by the way, includes seeing unexpected results in the lab.
The other problem with invoking magnetism, fusion, or fission is that none of these things provides for perpetual motion in the current body of observed evidence, and they have
never been observed to break those laws. The laws of physics have been upheld against such challenges because they are supported by the observable evidence, not because scientists worship conservation of energy.
ETA: A fundamental problem with perpetual motion is that in order for such a device to be useful, it must not only maintain its movement (which would require negating friction and gravity among other things, or tapping into some unknown force that hasn't been discovered by science, I guess), but it must actually create
more energy than is put into it.
So in order for Steorn's device to do this, it must not only negate the effects of friction and gravity (among other things), but it must also somehow create usable energy by, say, turning a turbine. It must also do this without using any external force that could ever possibly stop doing work, or else it is by definition a non-perpetual motion machine.
Magnetism isn't going to overcome entropy and run forever. It can help to mitigate gravity and friction, but it isn't just going to cancel out all forces involved. Moreover, turning a turbine to extract a usable amount of energy from the system would draw a huge amount of energy from the system (basically, whatever amount of energy you want to extract plus loss to heat and friction).