~ 9:10 PM September 14, 2015: ~ Two hours after Sunset I was out on my 3rd floor balcony, flying my quad copter, enjoying the lights on it (Red, White and Blue)very nice. Flew it straight out about 75 feet, directed it up to around 75-100 feet above ground and Swooooosh, in my peripheral vision to slight right, I saw a tear drop shape object pointed end first head swiftly to the West ( more right )of my Southern view. Freeked me out a little because it was illuminated by what I will have to say ambient light from the neighborhood and streetlights etc. The sky at the time was sparsely partly cloudy, low humidity, with fluffy clouds so there was visible blue ( but dark ) night sky and clear visible stars, jet planes etc. winds were calm. Finished flying the quad and, wow, I was thinking, was this UFO stationary and just observing us, me, someone? Did they get startled because my quad out there? Was too funny-weird to not take this incident "freak-me-out" serious. Brought the copter back in and got goose bumps. :D P.S. My guesstimate of it's speed will be ~250-400 mph and possibly more as it began to fade from sight at 50% to the right. I first caught perisight of it at around 20 degrees to my right and Swooooooooooooooooooooooooooooooooooooosh!