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For one that it was a property of mass and space: that would not allow for something like the Podkletnov experiment or the NASA/Boeing GRASP project.

For another, Einstein stated that information could not be passed around faster than C whereas it is well known that gravity propagates instantaneously to within our ability to measure it.

Don’t let yourself get amazed too easily. Einstein said some dopey things, particularly about gravity.

whereas it is well known that gravity propagates instantaneously to within our ability to measure it.

Wendy1946 has said some mighty dopey things about Physics here at FR. Like: "There’s never been a “big bang”, the universe is not expanding, and if dark matter or dark energy could be detected, it would not be dark. For that matter if the stuff were actually 95% of the universe as claimed, you’d be vacuuming it up off your carpets four or five times a day."

You're dead wrong about gravity affects being transmitted instantaneously - it is well known that gravity works at the speed of light just like all other fundamental force phenomenon.

Not being familiar with every last thing Einstein had to say about gravity, I can't say he didn't make any goofy statements there, but let's just say I hold him in slightly higher regard than you on the subject. (Massive, light-bending sarcasm there in case you didn't catch it....)

it is well known that gravity propagates instantaneously to within our ability to measure it.

I favor efforts to deconstruct Einstein's relativity, however, crackpots need to stand aside.