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Although I do not believe in UFO's (there is extra terrestrial life though) I want to react on your post: http://www.ufoevidence.org/topics/triangles.htm
I have seen this one for sure and by accident I came on your site when I was searching (again) for some explanations for it.. What I miss is this secret project from Martin Lockheed:
"Mr. Fouche describes the TR-3B's propulsion system as follows: "A circular, plasma filled accelerator ring called the Magnetic Field Disrupter, surrounds the rotatable crew compartment and is far ahead of any imaginable technology... The plasma, mercury based, is pressurized at 250,000 atmospheres at a temperature of 150 degrees Kelvin, and accelerated to 50,000 rpm to create a super-conductive plasma with the resulting gravity disruption.
The MFD generates a magnetic vortex field, which disrupts or neutralizes the effects of gravity on mass within proximity, by 89 percent...
The current MFD in the TR-3B causes the effect of making the vehicle extremely light, and able to outperform and outmaneuver any craft yet ...My sources say the performance is limited only the stresses that the human pilots can endure. Which is a lot, really, considering along with the 89% reduction in mass, the G forces are also reduced by 89%. The crew of the TR-3B should be able to comfortable take up to 40Gs... Reduced by 89%, the occupants would feel about 4.2 Gs. "
No doubt, after 20 years I found an explanation :)
Good luck on your UFO-hunting...