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Wheel Walking Tape
How to make a pingpong ball launcher without using metal or human help.?
1.The catapult will have a base (wheels, rubber base, etc.) that will not scuff the gym floor.
2. There is no weight limit on the catapult.
3. When in its ready-to-launch position for the 2 meter competition, the catapult must completely fit into a box 30 cm on a side (i.e. 30 cm x 30 cm x 30 cm).
4. The catapult itself must be made entirely of non-metallic materials; the only exception will be the use of metal fasteners
(hook eyes, rings, angle braces, etc.). Every effort should be made, however, to construct the entire apparatus from cloth, wood, rubber, latex, canvas, tape, glue, and other non-metallic materials. NO METAL HINGES OR METAL RODS WILL BE PERMITTED!
5. The catapult must be self-sufficient (i.e. no electric motors, human help, compressors, etc.). A release mechanism (i.e. a trigger) MUST be utilized to launch the ball. The trigger must be able to hold the launch mechanism in place, ie.the student must be able to set the trigger and walk away from the launch
I use to do everyone's project in high school and college. I should have a web site and sell projects for students to use.
2 meters is very small you basically can use a ruler, elastic bands, glue, cardboard, bottle cap, a lever, weighted with sand as timer
and trial and error
try this link
http://www.geocities.com/jeaton95@sbcglobal.net/answers.jpg
against me - walking is still honest(good quality)