Bro nigel pratt bronigel@kellenberg org dennis papesh papeshdr@holyangels cc
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Bro. Nigel Pratt [email protected] Dennis Papesh [email protected] Mousetrap Vehicle. Teams will design, build, and test a vehicle which uses one or two single-spring mousetraps as their sole source of energy for propulsion. Goal.

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Bro nigel pratt bronigel@kellenberg org dennis papesh papeshdr@holyangels cc

Bro. Nigel Pratt

[email protected]

Dennis Papesh

[email protected]

Mousetrap Vehicle


Teams will design, build, and test a vehicle which uses one or two single-spring mousetraps as their sole source of energy for propulsion.

Goal


Years ago

  • This is basically what you wanted to do (1986-1995) one or two single-spring mousetraps as their sole source of energy for propulsion.

    • http://www.youtube.com/watch?v=Hqc9uexNL64

  • The rules were very similar to what we have had with Wheeled Vehicle and Battery Buggy in the past.

  • BUT THIS YEAR – EXCITING CHANGES ARE IN STORE!!!

Years ago….


Parameters

Parameters


Parameters cont d

  • All parts of the vehicle must move as a whole, i.e. no anchors, tie downs, launching ramps, or other separate pieces are allowed.

    • If any piece falls off during a run, it is considered a Competiton Violation.

  • All of the vehicle’s kinetic energy must originate from the mousetrap(s).

    • Conversion of the mechanical energy of the mousetrap(s) spring is permissible, but any additional energy sources must be at their lowest states at the beginning of the run.

Parameters – cont’d


Parameters cont d1

Parameters – cont’d


Parameters cont d2

  • The vehicle must have a fixed, pointed object on the perimeter of the chassis of the vehicle that extends to within 1.0 cm of the track’s surface.

    • Toothpick, pin, small nail

    • Must be easily accessible to event supervisor without lifting or moving vehicle

    • The tip of this fixed, pointed object nearest the track surface will be used as the reference point on the vehicle for all distance measurements.

Parameters – cont’d


Parameters cont d3

  • The vehicle’s wheel base is the distance measured parallel to the direction of travel between the center of rotation of the front and rear axles, and it must be between 30.0 and 34.0 cm.

  • The vehicle’s maximum wheel width is the distance measured perpendicular to the direction of travel between the outermost side of the left and right wheels and it may not exceed 25.0 cm.

Parameters – cont’d


Parameters cont d4

Parameters – cont’d


The track

  • The competition will be on a straight and level lane with a relatively smooth, hard, low-friction surface.

  • Three quarter or one inch tape will be used to define the track’s starting line, a line 7.00 meters from the starting line (the “7 meter line”), and a line 8.00 meters from the starting line (the “8 meter line”)

The track


The track cont d

  • The same tape will be used to define the 1.50 meter lane side boundaries from the starting line to the 8 meter line.

  • The center of the start line will be indicated with an arrow drawn in ink pointing toward the inside tape, The 7 meter line will be likewise marked.

  • The distance between the two arrows will measure exactly 7.00 meters.

The track – cont’d


The track cont d1

  • Additional space must be provided in all 4 directions of the lane to allow for the vehicle over-running the track.

  • At the National Tournament, there will be 0.50 meters of additional space outside the lane side boundary and there will be 2.00 meters of additional space beyond the starting line and the 8 meter line.

The track – cont’d


The track cont d2

The track – cont’d


The competition

The competition


The competition cont d

  • The vehicle must be able to remain at the starting position without being touched until the trigger is released using a pencil, pen, dowel, or similar device.

    • which is not a part of and does not travel with the vehicle

  • It is considered a run if the vehicle moves any distance after the trigger has been released.

    • So if it doesn’t move. It’s not considered a run.

The competition – cont’d


The competition cont d1

  • The students may not push the vehicle nor will they be allowed to constrain the vehicle during release.

  • The fixed point of the vehicle is to cross the 7 meter line and return to the center of the starting line as quickly as possible in order to receive the maximum score.

The competition – cont’d


The competition cont d2

  • Reversing and stopping mechanisms must work automatically. The vehicle may not be tethered or remotely controlled in any way to guide it, reverse it, or make it stop.

    • So, you can’t do this….

      • http://www.youtube.com/watch?v=VO_k9Hkz_oU

  • Teams will have 10 minutes of Event Time in which to get two runs started.

The competition (cont’d)


The competition cont d3

The competition – cont’d


The competition cont d4

The competition – cont’d


The competition cont d5

  • Teams may not follow their vehicle down the track. has elapsed, it will be allowed to run to completion.

    • They must wait until called by the Event Supervisor to observe their finish distance and pick up their vehicle.

  • At this point, the Event Time will resume.

    • Students may take any measurements and make any adjustments to their vehicle.

The competition – cont’d


The competition cont d6

The competition – cont’d


Scoring

scoring


Scoring distance score

Scoring – distance score


Scoring lane bonus

Scoring – lane bonus


Scoring over run penalty

Scoring – over-run penalty


Scoring time score

  • The Time Score shall be the time of each run in seconds, measured in 0.01* seconds.

  • The time of the run starts when the vehicle begins movement.

    • If the vehicle does not reverse within 3 seconds after coming to a stop, the total run time will be the time of motion plus the three seconds.

    • If the vehicle reverses direction, the run time will stop when all motion ceases.

Scoring – time score


Scoring time score cont d

Scoring – time Score cont’d


Scoring competition violations

Scoring – competition violations


Scoring construction violations

Scoring – construction violations


Scoring tiers

  • Teams will be ranked in four tiers using the single run that will give them the best overall place where:

    • 1st Tier: A run with no violations and reverses its direction of travel

    • 2nd Tier: A run with no violations but does not reverse its direction of travel

    • 3rd Tier: A run with Competition Violations

    • 4th Tier: A run with Construction Violations or both Competition and Construction Violations

Scoring - tiers


Scoring cont d

  • 1 will give them the best overall place where:st Tie Breaker

    • Distance Score of the counted run.

  • 2nd Tie Breaker

    • The vehicle’s other run score.

  • If the device cannot start at least one run within the 10 minute period, or has two failed runs, the team will receive participation point(s) only.

Scoring – cont’d


Scoring example

At will give them the best overall place where:State competition, the run took 15.8 seconds. The fixed point crossed the 8.5 meter line, but not the 9 meter line, and ended up with its fixed point 18.6 cm from the center of the starting line. It stayed within the lane the entire run. No violations.

Time Score 31.6 points (15.8 sec = 15/8 sec x 2 pt/1 sec)

Over-run Penalty 100.0 points (50 passed 7.5 m + 50 passed 8.0 m)

Distance Score 18.6 points

Lane Bonus -20.0 points

Run Score 130.2 points (31.6 + 100 + 18.6 – 20)

Scoring example


So how do you make a good one

  • So for a basic construction: will give them the best overall place where:

    • http://www.youtube.com/watch?v=OOobN0bUxqs&feature=fvw

  • Things to consider and discuss

    • Dimensions of the vehicle

      • Keep in mind: KINETIC ENERGY

        • Mass, friction, efficiency of energy transfer

      • Experienced coach Wisdom re: rulers

      • Experienced coach Wisdom re: axles

So how do you make a good one?


  • Wheels will give them the best overall place where:

    • # - 3 wheeled v. 4 wheeled

    • Type – Rubber, balsa, plastic (DVD’s), etc…

    • Diameter – Should both axles have the same size wheels?

  • Energy Transfer: How will you transfer the energy of the spring to the axle for maximum speed?

    • Directly v. Indirect (spring, rubber band)

    • Torque issues are very important here – Axle thickness

    • Do you want to have the energy delivered very fast to the wheels and use momentum to travel down the course or should the energy be applied at a constant (but slow) rate to the wheels?


  • String issues will give them the best overall place where:

    • entanglement, “free string” getting caught in the axles/wheels

    • Type – String that stretches or doesn’t

  • Length of drive arm – short v. long

  • Please, please forgive us for the following…

    • http://www.youtube.com/watch?v=wZDSfRe5opo

  • How will you make it reverse???

    • Let’s take a brainstorming session…..


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