Project 3

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Problem Statement. This project entails proposing, designing, analyzing, constructing and reporting on a device that will propel racquetballs. Each ball will be required to remain in flight for any distance from ten feet to a maximum of fifteen feet. The target will be a 3' by 3' square with an 18" diameter hole cut in the center. It will be inclined at a 45 degree angle from the horizontal facing the shooter. Balls passing through the hole without bouncing first score 4 points, balls hitting35622

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Project 3

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1. Project 3 Rapid Fire Racquetball Ball Launcher

2. Problem Statement

3. Illustration of Demonstration

4. General Requirements Each team must submit a preliminary report, detailing your proposed solution to the problem. You must construct your launcher and demonstrate its performance in class. You must write a technical summary describing the project, your solution and any lessons learned from the experience.

5. General Requirements Fair market value of all components used in your design must not exceed $50.00. Your launcher must fit within a 15” x 12” x 10” tall box. The box will have a 4” x 4” hole cut in each of the 4 vertical surfaces as shown

6. General Requirements The balls must fly independently (i.e. one action by the user may not launch more than one ball) The design must be able of operating without any user intervention other than initiating the firing. This allows for the user to “cock” the launcher before each shot, but this must be done without opening the box. Any design which does not require individual “cocking” actions will be awarded a 5 point bonus on their demonstration score. All batteries used must be dry cell batteries. The total battery rating cannot exceed 10 A•hr. This is about 8AA, 5C, or 2D cell batteries, depending on type. The maximum air pressure allowed in your launcher is 40 psig. Your launcher must be fully contained within the box (with cover in place). To do this a wire or string can be extended out one of the 4 4” x 4” holes, however nothing (i.e. air, water, other fluids, electrons) can be pumped into the box. Any batteries you use must be inside the box, with just a switch outside the box.

7. General Requirements Components that may be disconnected from your design prior to placing the launcher in the box (bicycle pump, etc.) do not count towards the cost of your design, but must be included in your proposal. Those that are required for the launch (and therefore inside the box during launching, e.g. air tanks) MUST be included in the cost and in your budget. No design that must be plugged into a wall socket, even briefly, will be accepted. The ceiling height is guarantied to be at least 8 feet. Reaching your hand in through one of the holes immediately disqualifies your team for the demonstration.

8. Project Demonstration The target will be placed a distance of between 10 and 15 feet from the firing line. A standard 8” x 8” x 16” cinder block will be placed 5 feet from the firing line standing upright. Each team will have 1 minute to set up their launcher and place it in the box. Your launchers will then have up to 1 minute to launch up to 10 balls towards the target. The first 10 balls to exit the box will be considered the shots. Any ball that does not leave the box will not be counted as a shot.

9. Grading of the Project Preliminary report - 30 points Trial results - 40 points Technical Summary - 30 points Innovation – 5 points

10. Basic Timeline Problem ID, Preliminary Ideas, and Refinement, Analysis, Decision and Conclusion are due during Class 19.2 Project demonstrations will be held during Class 22.1 Technical Summary is due on Class 23.2

11. Requirements for Preliminary Report one cover page similar to the example shown in the plate book. This must include the column labeled “% participation” one copy of Problem Identification one copy of Brainstorming one copy per team member of description of best ideas and sketches sketches are not just “rough” sketches, but should reflect a degree of professionalism. They must be submitted on engineering paper

12. Requirements for Preliminary Report 2 (or more) copies of Refinement Scale drawings with a few critical dimensions Verbal descriptions of the designs 2 (or more) copies of Analysis, one for each Refinement You may following the format in the workbook or determine categories that are appropriate to your design. All analyses must use the same categories. 1 copy of Decision Complete a decision table including each of your refinement ideas 1 copy of Conclusion A verbal statement of which idea you all are choosing to implement and why.

13. Demonstration The demonstration will measure the accuracy of your launcher when the ping pong ball is launched. The target will be placed a distance of 10-15 feet from the firing line. A standard 8” x 8” x 16” cinder block will be placed 5 feet from the firing line standing upright. Each team will have 1 minute to set up their launcher and place it in the box. Your launchers will then have up to 1 minute to launch up to 10 balls towards the target. The first 10 balls to exit the box will be considered the shots. Any ball that does not leave the box will not be counted as a shot.

14. Demonstration During the demonstration any opening of the box will deduct 5 points from your score. You may not manually load any balls (or other things) through the holes during the launch. Any attempt to reach in through one of the holes will immediately disqualify your team and they will be awarded a grade of zero for the demonstration. Points will be awarded as follows: 1 point for each ball which successfully leaves the box, up to a maximum of 10 An additional 2 points if the ball hits the target board, but does not go through the hole An additional 4 points if the ball passes through the hole These additional points are contingent on the ball not bouncing prior to reaching the target

15. Technical Summary Content I Overall is well-organized into logical, separate report sections uses a clear system of highlighted headings to identify sections clear and concise Includes a Table of Contents which reference the sections

16. Technical Summary Content II Content begins with a clear introductory section thoroughly reviews the methods by which the product (the launcher) was developed documents the results of the test trials discusses (analyzes) the product's (launcher's) performance, indicating strengths and weaknesses and comparing expected results to actual results includes any conclusions or implications drawn from the work

17. Technical Summary Content III Writing Style uses clear sentences with active wording, uses well-structured paragraphs is consistent in style and flows well (doesn't sound like it was written by four different authors) uses general audience terms where possible and appropriate (no unnecessarily complex writing) no errors in grammar, spelling, and punctuation

18. Technical Summary Content IV Graphics must be titled and labeled (e.g. Figure 1: Orthographic Views) must be referenced in the text and explained as needed

19. Technical Summary Content V Required Elements measurements of horizontal range as a function of any variable launcher parameter(s); a comparison of experimental data to theoretical predictions, as well as a discussion of error analysis; complete cost analysis for the construction of your design, including copies of ALL receipts included in an appendix what did you learn and how could it have been made better

20. Innovation Innovation is the quality of producing something which is new. Many ideas have been tried over the years which are not innovative, to encourage thinking out side the box, 5 points will be awarded for innovative designs.

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