Video of the crash showed what appeared to be a large object plunging into the river, followed seconds later by what appeared to be a helicopter blade ... Airlines regional jet and Army helicopter ...

I had to admit to a little bit of stage fright.” When the blade-tip jet engines on the helicopter fired up, flames shot from the ends of the rotor blades. “The whoosh-whoosh of the whirring ...

The only evidence at this point in the investigation is eyewitness accounts and bystander video, both of which suggest that the helicopter’s rotor blades ... Airlines jet and an Army helicopter ...

Obviously there are a great many differences between attack helicopters and fighter jets, but one of the distinct advantages jet pilots have ... the iconic rotating blades have prevented a similar ...

The helicopter blades are flexible, like a pool noodle. If you lower them quickly, their momentum will keep their tips moving in the same direction after the base of the blade has stopped.

As the helicopter speeds up, more of the LHTEC T800 engine power goes to the propulsor, and the main rotors can be slowed so the advancing blades’ tips don ... it used a small jet engine ...

Engineers now say they understand the most likely cause of the Ingenuity helicopter's crash landing on Mars earlier this year ...

A witness told AFP it appeared like the helicopter's rotor blade "shattered in the sky ... of a dramatic 2009 incident when a US Airways jet safely landed in the water. All 155 people on ...