Trajectory 2010

Dennis Papeshpapeshdr@holyangels.cc

dpapesh@aol.com

Goal

The team will design, construct, calibrate, and shoot a device capable of launching a ball into a target area, and collect data to develop a series of graphs relating launch configuration to target distance and height.

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Parameters

Prior to competition, students are to develop and use performance data and calibrations charts to assist in determining the best launch parameters given different distances and heights.

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Possible Changes

Eye protection – ANSI Z87+Must fit in cube, in launch configuration,

prior to all launchesCube size will be reducedAbility to launch from side of deviceTriggering device must pose no danger

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Possible Changes

Height interval will be reducedSubmission of 4 different graphsMay be required to turn graphs in early,

electronicallyGraph format may be specified for

electronic submission

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Possible Changes

One graph may be selected for gradingSelection choice by event supervisor

Graph score may be multiplied by 4

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Parameters

Launch devices, copies of graphs, and all materials teams will use (other than goggles) are to be impounded.

Target distances and heights will not be announced until all devices have been impounded.

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Parameters

Eye protection rated ANSI Z87+ must be worn by participants during building, testing, and launching.See www.soinc.org/general /protection

Event supervisors may disqualify any apparatus that is operated in an unsafe manner.

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ConstructionLaunching force must be supplied by non-

metallic elastic solids such as rubber bands, bungie cords, etc.

Must be triggered from outside of the launching area. Radio controlled triggering devices are not permitted but battery triggered devices are allowed.

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Construction

The launching device, in launch configuration, must fit within an 70.0 cm cube for Div. B, 60.0 cm cube for Div. C prior to all launches.

Any weights used to stabilize the device must be within the respective cube.

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Construction

Teams must make provision to trigger the device in a limited space behind and on both sides of the launch area (50 cm minimum).Easy, light pull triggerPerhaps an eyebolt, through which string

feeds to trigger can be pulled from either side

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Construction

Teams will provide a projectile that shall be any unmodified tennis ball, racquet ball, ping pong ball, or plastic practice golf balls (wiffle or dimpled type) (labeling is permitted). Hackie Sacks not permitted.

Teams are not required to use the same projectile for every launch.

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Construction

The triggering device is not considered part of the device. It must extend out of the launch area and does not need to return to the launch area after the launch.

Students must be outside the launch area while triggering the device and may touch only the part of the triggering device that extends outside of the launch area.

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Construction

• The triggering device must not pose a danger to other competitors or spectators due to flying parts or excessive movement outside of the launch area.

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Competition

Students will place the device in a launch box 1 meter wide (perpendicular to the launch direction) and 1.5 m deep, designated by tape on the floor.

Once teams are in the event area, they may not leave or receive outside assistance, materials, or communi-cations. DQ

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Competition

Students may not touch or hold the device, or be in the launch area, or the area in front of the line that marks the front edge of the launch area.

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CompetitionBefore and after a shot, all parts of the

device must be within the launch area.If any part of the device extends outside of

the launch area during a launch, it must return to and remain in the launch area without assistance of the participants.

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CompetitionTwo target areas will be placed in a

straight line in front of the launch area.

Each target will be an approximately 1 meter square box or a 1 meter diameter circle.

Each will contain sand or cat litter to mark the impact area.Custodians prefer cat litter

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Competition

The center of the target areas will be marked so that the distance between the center of the initial projectile impact location and the center of the target may be measured.

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CompetitionThe center of the target areas will be

placed between 2 and 8 meters (Div. B) or between 2 and 10 meters (Div. C) from the front of the launching area (in 1.0 meter intervals for Regional, ½ meter intervals for State, and 10.0 cm intervals for National.

The centers of the two targets must be separated by at least 2 meters.

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Competition

The target areas will be at two different levels with the higher target being nearer to the launch area.

The higher target will be measured in 1.0 cm intervals above the floor, up to one meter for Division B; up to 2.0 meters in Division C.

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CompetitionThe farther target shall be at floor

level.The height of the target will be

measured from the floor to the top surface of the 1.0 cm deep impact area.

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Competition

No practices shots will be allowed but adjustments may be made to the launching device between shots.

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Competition - Bonus

The ES will make provisions to place a bucket on the course if requested for a Bucket Shot.

The bucket will be a size chosen by the ES and placed anywhere on the course between stipulated course lengths.

The bucket may be placed up to 2.0 m to the right or left of the center line.

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Competition - Bonus

• After impound, the distance to the center of the bucket and the distance off the center line will be announced.

• The size of the bucket will then also be disclosed.

• The bucket will be placed in the same location for all competitors requesting a Bucket Shot.

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Competition - Bonus

• The bucket should only be on the course when requested so as not to become an obstacle for other shots.

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Typical lane set-up

Launcharea 2m

fromline

8mfromline

Neartarget

Fartarget

either/or

Device

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Typical lane set-up

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Competition

Each team will have 10 minutes at Regionals and State, 8 minutes at National to place the launching device in the launch area, check the launch distances, and complete 2 shots at each of the target areas.

The time for measurement of the device or projectile impact will not be included in the allotted minutes.

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Competition

No practice shots will be allowed but adjustments may be made to the launching device between shots.

Teams must inform the event supervisor before each launch and indicate at which target they are aiming.

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Competition

After each launch, the ES will indicate to the students when they may approach the target to make measurements to calibrate their device.

Students may not touch either target.

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Competition - Bonus

If the projectile hits the pin in the center of the target on the first shot at the target, they may request a Bucket Shot for bonus points.

The team will receive either -50 bonus points for their projectile hitting the bucket at first impact and bouncing away or -100 points for having it land inside the bucket at first impact and remaining there.

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Competition - Bonus

No bonus points will be scored for missing the bucket.

The bucket shot is not an extra shot as it replaces the second shot at the target.

Any team that requests the Bucket Shot will not have a second shot to use as a 3rd or 4th tie breaker.

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Competition - Bonus

In the case where this is required, the team that took the Bucket Shot will be scored behind the team with which they are tied.

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Penalties – 100 points apiece• Student is warned for not properly wearing

eye protection.• A participant is in the launch or target area

when the launch is triggered• No warning given prior to a launch. (Such

launch, even if unintended, shall count as one of the four allowed launches.)

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Penalties – cont’d

Any part of the device is outside of the 1 meter by 1.5 meter launch area prior to or after a launch.Perhaps students can set their device a

definite distance back from line in case it moves forward on launch.

Students will be informed of a penalty they have received before the next launch.

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Scoring

The winner will be the team with the lowest Final Score.

Final Score = lower Close Target Area Score + lower Far Target Area Score + Graph Score + Penalties + Bonus (if any)

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Close Target Area Score

It shall be the distance in mm from the center of the initial projectile impact location to the center of the target area.

Teams who miss the target area will score 800 mm for that shot.

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Far Target Area Score

It shall be measured similarly for a hit in the target area but measured to the impact location if outside the target area.

Supervisor(s) will visually note and mark the observed impact location outside the target area, then measure the distance in mm.

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Far Target Area Score

If the device fails to launch due to breakdown or other reason, score for launch will be the distance from the front of the launch area to the center of the far target in mm.

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Far Target Area Scores

If the announced target area is the farther target but the projectile hits the nearer target, the score will be a straight line measured distance between the impact location and the center of the farther target.

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Graphs

Each team starts with 400 graph points, which can be reduced by turning in 4 different graphs and data tables.

This data may be required to be turned in by a selected date prior to the event, or at impound, as determined by the event supervisor.

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Graphs

Supervisors will specify what format is to be used when graphs are to be submitted electronically.

Each of the 4 selected graphs may reduce the Graph Score by 100 points.

Any number of graphs may be impounded but students must indicate which 4 will be used to determine the graph score.

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Graphs continuedFailure to indicate which graphs to score

will result in one of the 1st four graphs being scored.

Graphs and tables may be computer generated or hand drawn but must be on separate sheets of paper and each pair must be on the same side of the paper.

If drawn by hand, they must be drawn on graph paper.

Data tables must accompany graphs.

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Graphs continued

Graphs and tables must be properly labeled.

All variables and units must be identified.Each sheet of paper must be identified

with the team name.One of the 4 graphs, selected by the event

supervisor, at their discretion, will be scored as follows:

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Graph Scoringper graph

20 point reduction for completed data table

20 point reduction for graph20 point reduction if graph matches data

table40 point reduction for graph being properly

labeled (title, x & y variables, increments with units, team name)

Partial credit may be given46

Graphs

The score of the scored graph will be multiplied by the number of graphs turned in (up to four).

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Scoring Example

• Lower Close Target Area Score = 10 mm• Lower Far Target Area Score = 1487 mm• Graph Score = 150• Penalties = 100• Bonus = 0

• Final Score = 10 + 1487 + 150 + 100 + 0 = 1747

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Ranking (tiers)

1st Tier – Teams whose devices meet all specifications.

2nd Tier – Teams whose devices do not meet specifications listed in 3.a, 3.b, 3.c, and/or 3.d

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Tie Breakers

1st – smallest distance in measurements between the two scored shots (to reward consistency)

2nd – closer of the two scored shots to center of target area

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Devices

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More devices

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Typical device

upright

Elastic material

Launcharm

stopper

trigger

Maximum of 80 cm

Max.

80 cm

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Areas to experiment

Launch arm – having several holes will allow students to determine the proper ratio of effort force to launch force.

Upright – having several holes will allow students to experiment with launch arm height.

Upright – being able to move it on the base will allow for experimentation.

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Areas to experiment

Trigger – something simple, free from jamming, and operates without the need to jerk anything too hard.

Non-metallic elastic material – rubber bands? Bungie cords? The material they use to restrict the flow of blood for a blood draw? Plenty of room for experimentation.

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Areas to experiment

Stopper – having a series of holes will allow students to determine the proper height for the launch arm to stop moving.

Length of throwing arm.

Distance throwing arm drawn down or back.

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Reminder

It is up to the students to design, construct, test, and calibrate the device.

‘nuf said on that

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