"Could you be more specific and straightforward skeptic? I'm never good when it comes to understanding sarcasm. Are you saying that physicists working in the private sector are making significant contributions in this field?"
I fail to see any sarcasm, and I do not see how I could have been more direct. The plain truth is that certain high-tech companies, such as BAE Systems, are giving (according to the review) serious consideration to certain space-drive ideas which, if shown to a high-school physics student, would make him lol. An example: one of the devices is the patented (sic) 'Cuthbert Drive'. This is simply a couple of oscillating arms which flail to-and-fro (there are dozens of similar patents in the literature) and are supposed to propel themselves in outer space. It appears that it is being taken seriously because it works on an air-table. The next step (I have been told) is to put it on a 'vomit-comet' for free-fall testing. Hands-up those who think that it will work? So, I am saying that 'high-tech' engineers (but, I hope, not physicsts) are wasting time and money on crackpot activities. It could be that they are being forced to do so by bean-counters who are following the Pascal's wager strategy: 'there is near-zero chance of its working, but the profits would be almost infinite, so the expected profit is finite'. (That is my version of the PW, so don't get sidetracked by attacking it on the basis that it is not pure Pascal.) There could be a more worldly reason: I have heard that some companies back projects which are sure to fail so that they can offset the costs for tax-avoidance purposes.