No Imi

No Imi

For a change of colours from the sandy brown, blue sky and the black and white yesterday, I am jumping through my photo to my recent visit to the Royal Melbourne Show 2006. It was a great place with the damn hot sun hanging high and showers approaching the night. The colours were great. I told myself that I should have went there earlier as 1st October was the last day. This featured ride inmy blog is called No Imi. A 360 degrees turn ride with some hanging in the air still moments. Of course I didn't ride it or else the people bellow better start opening their umbrellas. This ride was powered by a fan. Yes, a FAN! a gigantic fan fixed to main arm. It is able to stop the ride in the mid air and turn it the make it swing the other way round!



There are three main types of fans used for moving air, axial, centrifugal (also called radial) and cross flow (also called tangential). The axial-flow fans have blades that force air to move parallel to the shaft about which the blades rotate. Axial fans blow air across the axis of the fan, linearly, hence their name. This is the most commonly used type of fan, and is used in a wide variety of applications, ranging from small cooling fans for electronics to the giant fans used in wind tunnels. The centrifugal fan has a moving component (called an impeller) that consists of a central shaft about which a set of blades form a spiral pattern.

Fans typically go along together with electric motors. An electric motor's poor low speed torque and powerful high speed torque are a natural match for a fan's load. Fans are often attached directly to the motor's output, with no need for gears or belts. The electric motor is either hidden in the fan's center hub or extends behind it. For big industrial fans, 3-phase asynchronous motors are commonly used.

(courtesy wikipedia.com)