MagLev

General
Originally called Car of Tomorrow, this event has been run as a trial in New York and Wisconsin. It was run as a Division B trial event at the 2011 National Tournament. In 2012, New York will run the event as a Division C trial under the full name Magnetic Levitation.

The complete, official rules can be found here.

Basics
Car-This event revolves around the car. It must move down a track on fans. It must magnetically levitate (pemanent, non-rare earth magnets) on the track.

Sled-The car must pull a sled that has a weight of anywhere from 50 to 200 grams in 5g intervals.



This is the method of sled attachment. The sled must be 4 inches long. It then must have a string that attaches to the car that is at most 3\4 inches long.

Mass-You generally want to keep your mass to a minimum. A good mass is from 250 to 300 grams with the fans and motors all together. Keep glue used to a minimum. It weighs down the car a lot.

Parts
Propellers-These should be modified to have a 45 degree angle from the motor. You also want long, straight, and large (surface area wise) propellers to get the highest performance. Remember, the larger the diameter, the better the propulsion (to an extent, of course).

Motors-You want mostly high speed motors. They have to push air to move a car almost frictionlessly. High torque therefore is not as necessary as other events like Battery Buggy.

Chassis Base-This part needs to be light enough to not weigh back the motor, yet strong enough to withstand countless impacts, vibrations, and motor kickback.

Chassis Tower-This part must be secured to the base in order for it to not fall off. It holds up the motor. It must withstand perpendicular pressure from the fans. It also must be low. It needs a low center of gravity so the car doesn't tip. But you don't want it too low, or else it will scrape the track.

Magnets-Very possibly one of the most important parts of the car. It must have magnets in order to float. They must be permanent (not electro) magnets, and not rare earth magnets. For magnet placement, see Miscellaneous:Track.

Requirements/Qualifications/Parameters
Length-The car may not exceed 7" in length, while not being below 4" in length.

Mass of Car-The mass of the car may be anything over 200 grams, though I don't recommend any mass higher than 300 grams.

Power-The car must have one or two 9 volt batteries powering motor(s) and propeller(s). They cannot power anything else. Yes, this means you can't have electro-magnets. Also it must have the batteries wired in parallel, not series, which is still only 9 volts, if you use multiple batteries. It shouldn't take a Shock Value person to figure this paragraph out.

Eye Screw-The car must have an eyescrew with at least 1/8 of an inch free attached to the car.

Magnets-See above.

Height-No requirements that I know of.

Width-No requirements other than it fits in the track. I recommend it is lose in the track to minimize drag.

Miscellaneous
Track-The track consists of two metal sides and a metal bottom. It has two magnet strips in the corners of the track. It looks like this:





The car therefore must have magnets at its edges so that it can levitate on the track. The same goes for the sled. It is an eight foot long track.

Start of the Track-The car should be started from a point on the track marked (the rules say exactly where). It is easiest to start the fans and then have a pencil or something of that manner blocking it from moving. Then you should release the pencil just before starting the timer.

Target-The car should have a pillow or block of wood (that falls over, keeping the car from tipping) that is at the end that cushions the impact. The timer should stop as soon as this target is reached.

Competition Preparation
Graphs and Tables- Before the competition, you must make graphs and charts that will display data from test runs of the car. These are required by the rules, and are awarded extra points if they match each other. It is best to do more than one run at each weight to increase reliability. These graphs are invaluable, not only because of their necessity by the rules but also of their help in accurately estimating the time needed, which plays a very important role in the event.

Tips- To run well, the car needs to be balanced. This is accomplished by adding weight where needed, and by not overcrowding the device. One way to overcrowd is to have more than one motor arranged side-by-side. When this happens, if the device is slightly off weight, it may capsize and break.

If your car is touching the edges of the track, it will need to be lubricated. You will need to experiment for yourself which lubricant is right for you.

Pre-competition
Impound-You will need to impound your car. It must fit the parameters (see above).

Score
Run Score-The team that goes the fastest gets 100 points. Other teams get their points by this formula: The team's fastest time on the data sheets/the teams fastest time, then multiplied by 100.

Prediction-Prediction plays a big role in this event. Much more so than any other event. It has a complicated formula. Check the rules at the link above.

Graph-Competitors will hand in a table with the data on it and a graph that matches the table. These will be scored as follows: 5 points for:

a. a complete table b. a graph c. the graph matches the table d. the labels are correct: team name and number, title, x and y axis titles, and x and y axis increments

Final Score-These add up to create the total score.

Run Preparation
It is important to make sure that you have all required materials. Remember to bring several new batteries, a backup propeller, tape, super glue, a copy of the rules, and any other tools or parts that are needed specifically for your vehicle.

During The Run
Check before the run to ensure the polarity of your magnets are correct. Ask any questions or clarify anything you need to know before running. Just remember, in this event, the MagLev track is only eight feet long, so the reaction time of the supervisor/timer will have a huge effect on time. However, if the timer is a bit late for every competing team, it will solely come down to the speed of your vehicle, so test it and make sure it can move very fast.

Good luck!