Archive for 'Rotor' Tag

Hovering Helicopters!

by Stephen M. on Jun 2, 2009

EDITOR’S NOTE: Welcome to today’s guest writer, Stephen. ———- Helicopters are fascinating creatures. One of their distinguishing features is their ability to hover in place. This is essentially accomplished through a torque and force balance. For the forces we must look at Newton’s second law of motion: Notice the arrows on top of the force [...]

Rotor Imbalance: Theory and Risks

by Hans F. on Feb 19, 2009

Have you ever driven a car that vibrated uncontrollably at certain driving speeds, especially on the highway? If you have, you probably noticed that these large vibrations occur when you drive at one specific speed, as shown on your speedometer, and the vibrations die out when you travel a little lower or higher than that [...]