[samplonius]

So "space" is some magical place where measurement error does not exist?

Low earth orbit isn't perfect either. You still have micro gravity. And the experiment requires a lot of power, and very sensitive instruments to measure the phenomenon. How do you get sensitive instruments which are expected to be operating near their error threshold into orbit without damaging them?

Orbital experiments will have to be smaller, and use less power, so the effects will even be smaller. But the instruments will have to be tough enough to withstand 5G. And the apparatus could still be introducing other errors, like coolant momentum, which also isn't magically eliminated by being in space.

[stale2002]

The experiment is pretty simple.

You put the engine in space, with solar panels, and you see if it stays there or falls back to earth.

There is no experimental error, or even measurement devices.

It is a space engine. Either it flys or it doesn't.

Over the course of a year, it will be obvious if it works or not. Because if it doesn't work it will fall to earth.