Islami said the rotor blade snapped off, the copter spun to the ground and burst into flames.

CNN: 2 killed as helicopter crashes into crane in central London

The Air Accidents Investigation Branch (AAIB) found there was a rotor blade fault that caused them to strike the craft and separate.

BBC: Ely helicopter crash

It's a catheter with a rotor blade at its tip that chops away at the gunk on the artery walls and then sucks it up.

FORBES: Money & Investing

Each blade on the three-blade rotor is to be 150 feet long.

CNN: Wind farm to be built off Delaware shore