A new study suggests a possible cause of the pitch’s erratic flight — sudden changes in the drag force on a ball, due to a phenomenon called a drag crisis. The result is at odds with previous ...

The airspeed is NOT the road speed unless the bike is moving in still air. It is the speed of the bike relative to the air that must be used to estimate the aerodynamic drag. The two curves associated ...

They measure airspeed (the speed of the aircraft relative to the surrounding air) by sensing the impact pressure, the difference between static and total pressure. But this well established technology ...