Junkyard Challenge

In this event your team must prepare and bring materials to build a device on site to complete a task.



The Tasks
1. Tipping the scale - teams must build a device that is able to measure the mass of a "challenge object". Teams will not know what the challenge object is until after the impound. It will be no larger then 10.0cm x 10.0cm x 10.0cm for the Regional Tournament,25.0cm x 25.0cm x 25.0cm for the State Tournament, and 25.0cm x 25.0cm x 100.0cm for the National Tournament. Its mass will be between 100.0g and 500.0g for the Regional Tournament, 10.0g and 1000.0g for the State Tournament, and 10.0g and 2000.0g for the National Tournament. You will also have to use a mystery material in your device. Construction time will be between 30-45 minutes. You have 5 minutes to give the judges the weight of the object.

2. Coin Sorter - teams must build a device that is able to sort out five dollars worth of mixed change. The coins must all go into different storage places according to their value. These must be marked and you must be able to get the coins out so they can be scored. You have a minute to sort as many coin as you can using your device. There is a mystery material that must be used. Construction time will be between 30-45 minutes.

Other Info

 * The materials you bring must fit in a box with outside dimensions no greater then 26cmx31cmx46cm. The box can be made of any material but the lid must close completely with all materials inside the box.


 * ALL forms of glue are forbidden at the event site. Pre-glued components are permitted.


 * Tools may be brought in a separate container, they do not have to be impounded. Tools can not become part of the device unless they were impounded in the materials box. Electrical or battery operated power tools may NOT be used.


 * All competitors MUST wear safety spectacles with side shields during construction AND demonstration by ANY competitor.


 * Acids, bases, and flammable liquids may not be brought to the competition.

2010 Event Parameters
For the 2010 event, you must build a device that will use a standard unmodified golf ball to trip 4 mousetraps, within one minute. In a specified order (North, South, West, East) will get you bonus points. All the materials must fit into a box at most 40x40x60cm.

You may not bring glue or power tools to the event. You may preassemble some parts as long as they fit into the 40x40x60cm box, you have 30 minutes to assemble the device on site. You must drop the golf ball into the device at the central point.

You may use up to 6V of electricity to power your device to add on to its accuracy.

You may get bonus points if the device operates for at least 5 seconds before you trip the first mousetrap. And 2 bonus points per second the device operates until all the mousetraps are tripped. This means that if you complete the task at 59 seconds or 60.00 seconds, you will have a lot more bonus points.

You may not touch the device after it begins operating unless you want to lose points, you also may not secure the mousetrap directly to the floor. The mousetrap or any part of the device may not become an unshielded projectile at any point.

General Designs
The first thing to do when designing your contraption is to decide how to set off your mousetraps.

Direct Triggering
In this design, each mousetrap directly sets off the next, such as tying a string from the bar of one mousetrap to the trigger of the next. Once one mousetrap goes off, the rest go off in a fairly short amount of time. Sometimes it can be hard to distinguish one trap tripping from another, so they all appear to go off at once.

Indirect Triggering
In this design, each mousetrap starts a series of events to set off the next, such as a mousetrap releasing a ball to roll down a ramp to the next mousetrap. This is a fairly popular design technique, but if one mousetraps fails it can be hard to get your contraption working again mid-competition.

Independent Triggering
In this design, each mousetrap has nothing to do with the next mousetrap, such as each ball rolling down a separate ramp. If one mousetrap doesn't go off, the next will.

How to get the Most Points
Lets break down how to get the most points possible: The first two are gimmies. If you don't get those, drop out right now. The third is also fairly easy, just pay attention while setting mousetraps. The fourth, once again, if you don't get it, drop out of JYC. The next one is more difficult than the others: if all the moustraps don't go off without direct touches then you won't get this one. If you get these points, then you will also get 140 pts for all 4 mousetraps going off (35 pts per mousetrap). As long as you have a system to delay the trigger of each mousetrap, you should get all 225 pts for the mousetraps going off in the right order. What can get people confused is usually you thing "North South East West" or "North East South West", so pay attention to the order that you set them to go off. Independant triggering or indirect triggering may get you these points, but direct triggering will not (see above). Take this into account while designing your contraption. As long as you have some form of delay, you can get the 42 points for lasting 5 secs. The 2 pts per second may not seem like much, but if you do it right, you can get 120 pts out of it, which can make the difference between first and last.

Links
New York Coaches Conference

Soinc Junkyard Challenge Page