Monthly Archives: January 2018

*Fortunate* Motorcyclist survives driving off cliff


http://www.cnn.com/videos/us/2017/08/11/motorcycle-plunges-off-cliff-santa-monica-mountains-california-orig-trnd-lab.cnn/video/playlists/caught-on-camera/

My comments to CNN:

Cliff-diving motorcyclist Matthew Murray, 27, passes a “25 MPH” advisory sign in the 12th second of CNN’s video clip. This is in the 2nd run through of the crash video. In the 15th second he’s going 68 MPH as he starts to lean into the turn. He’s still going more than 50 MPH as he slides off the pavement and onto the dirt. Text on the screen says something to the effect that he “was following the turn when he thinks his steering locked up”. The video shows no such thing. He was going too fast, and could not turn sharply enough to follow the turn. He started at more than 2.5 times the advised speed. He left the pavement at 2 times the advised speed. His speed “locked” his path, not his steering.

Get the an accurate map of the curve, the size and tread pattern of the motorcycle tires and a description of the motorcycle (make, model, horsepower, brakes,weight-as-crashed) and rider (weight). Give to “Mythbusters”. Have them duplicate the failure, during deceleration, then do a binary search for the steady speed at which a motorcycle on those tires, at that weight, could follow that turn. Braking uses traction, does that change maximum speed?. Find the entry speed, before braking, that would allow the bike to make the turn. Put a GoPro on the bike for comparison pictures, and a second one showing where the front tire touches the road.