[chaosagent]

Biggest bunch of BS I ever heard. The motor, the frame, most everything except the rotor(which could be carbon graphite) reflects radar. They were just asleep at the wheel.
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Not necessarily. Most ATC radar are not able to see something the size of a bicycle going 40-50 MPH.

And it sounds like he was flying in between the buildings. A return like that would probably be filtered out as ‘ground clutter’.

[cynwoody]

Most ATC radar are not able to see something the size of a bicycle going 40-50 MPH.

My impression is, most ATC radar can't see anything that isn't squawking (unless the radar is configured to show primary echoes, which it usually isn't, because the extra detail annoys the controllers). You need military radar for that. At least in Malaysia.