"With brushless motors (like stepper motors), the magnetic field controls the position of the output shaft. So the ESC controls the position of the motor. Instead of having a servo control signal, their controller directly controls the power to…"
"I think I paid about $700 for mine back in 1995/1996. I thought the resolution was 640 by 480, but I guess per eye and side by side that comes out to about 600 by 800 ish. They work well with glasses too."
"Hmmm, it says " Operating Within the Sovereign Airspace of the Town of Deer Trail, Colorado." But my understanding is that all US airspace is public use and not owned by individuals/towns/whatever. I could be wrong though."