The Turtle 360: Decelerating A Bike Using Eddy Current
J N Burnett Secondary
Floor Location : M 071 N
Riding down a steep slope is dangerous and it is difficult to control a bike at high speeds. If cyclists ride on roads with many hills, they will have to squeeze onto the brakes for a long time. If the tired biker's hand slips, the bike will quickly accelerate and often can result in injuries. How can manually holding down the brake be minimized in a normal bike? rn Using the concept of eddy currents, an apparatus (The Turtle 360) was fixed onto the bike, with an aluminum and copper disc (conductor) spinning with the wheel, while 12 stationary neodymium magnets were attached. A small wheel was attached against the front wheel. When the front wheel spins, the rod would spin as well, causing the aluminum and copper discs to spin. rnrnDesign features include:rn-The small wheel which allows the eddy current to be strong even if the bike is going at a slow pace.rn-A hydraulic system which can be used to move the magnets closer or further, thereby turning on or off the braking effect. rn-An extra steel plate which can be placed behind the aluminum and copper discs so that the magnetic field would be directed from the magnets and most importantly through the discs, to the steel plate. rn-The Turtle 360 is an accessory, it can be removed or attached.rn- It gives the same exercise as exercise bikes with resistance, except that the cyclist can enjoy the fresh air and nice scenery.rn- It may be used to generate electricity on the other side.rnrn Two experiments were done to test The Turtle 360, a lab test and a bike test to find the power of the brake. A formula was found (applicable for The Turtle 360), y is equal to the power of the brake, while x is equal to the weight: y = 0.207x + 9.668. rn The Turtle 360 was successfully built and the goal of assuring safety was met. Both participants of the bike experiment definitely felt safer riding down the slope with The Turtle 360 applied than without it applied.