One of the most well-known traditions representing the New Year's Eve celebration is the ball drop in New York City's Times Square. A very decorative ball made up of thousands of crystals drops down a pole during the final minute of the year. This year's ball has seen many upgrades from its 2007 version- it's three times brighter, double in size and most notably, has increased in weight from 1,100 pounds to 12,000 pounds.
The ball drop occurs via an electric motor which lowers the ball 70 feet over the course of one minute. The weight increase means that more power will need to be supplied from the motor. We did some research on past ball drops and here's what we know: the gearmotor's output shaft must be 6 rpm and the time must be negligible since timing is crucial for the ball drop event. What we don't know is the minimum horsepower needed by an electric motor.
To see the solution: http://www.info.knovel.com/knovelmessages/NYESolution.html
Posts
No comments:
Post a Comment