As you know, beside LENr wich is well established scientifically, there is a serious experimental challenge to theory : the EmDrive and variants
(I follow that story on my scoop.it)
Next Big Future covers the test of that reactors by NASA, with short update.
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Update on EMDrive work at NASA Eagleworks
Experimental Thrust is at 50 micronewtons but need at least 100 micronewtons to go to Glenn Research Center (GRC) for a replication effort in the next few months
the big news, is despite huge problems (broke amplifier...) they confirmed the results in hard vacuum, in both directions, however they need more thrust to be allowed to go to Nasa GRC...
The bad news is that analysing Shawyers results, the EmDrive does not scale well with Q (quality of the resonating cavity) which may ruin the hope to have huge thusts able to launche a big vehiche from earth.
anyway for satellites, with solar panel or LENR, the modest thrust of EmDrive is already interesting.
another interesting point is that the team have advanced in a modelisation of their quantum plasma theory...
EmDrive is the second blackswan that I see in next decade.