Trajectory 2010

1. Trajectory 2010 Dennis Papesh papeshdr@holyangels.cc dpapesh@aol.com

2. 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. 2

3. 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. 3

4. Changes Eye protection – ANSI Z87+ Must fit in cube, in launch configuration, prior to all launches Cube size reduced Ability to launch from side of device Triggering device must pose no danger 4

5. Changes Height interval reduced Submission of 4 different graphs May be required to turn graphs in early, electronically Graph format may be specified for electronic submission 5

6. Changes One graph may be selected for grading Selection choice by event supervisor Graph score may be multiplied by 4 Addition of ‘Bucket Shot’ bonus 6

7. 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. 7

8. Colors used in presentation Indicates items similar to last year Indicates changes to the rules Indicates an idea which may help students or coaches 8

9. Parameters Eye protection rated ANSI Z87+ must be worn by participants during building, testing, and launching. See www.soinc.org/general /protection Eye Protection Level # 5 Event supervisors may disqualify any apparatus that is operated in an unsafe manner. 9

10. Construction Launching 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. 10

11. 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. 11

12. 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 trigger Perhaps an eyebolt, through which string feeds to trigger can be pulled from either side 12

13. Construction Teams will provide a projectile that shall be any unmodified (labeling is permitted) tennis ball, racquet ball, ping pong ball, or plastic practice golf balls (wiffle or dimpled type). Hackie Sacks not permitted. Teams are not required to use the same projectile for every launch. 13

14. 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. 14

15. 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. 15

16. 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 16

17. 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. 17

18. Competition Before 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. 18

19. Competition Two 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 19

20. 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. 20

21. Competition The 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. 21

22. 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. 22

23. Competition The 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. 23

24. Competition No practices shots will be allowed but adjustments may be made to the launching device between shots. 24

25. 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. 25

26. 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. 26

27. Competition - Bonus The bucket should only be on the course when requested so as not to become an obstacle for other shots. 27

28. Typical lane set-up